B1HE/B1KE Faults/Codes
Mar 08, 2024
34
| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.5 | System continues op- erating in normal mode with replacement value. | Lead break or short circuit | Check plug 33/X6 and cable: g Check voltage level, to see if 5V present at plug 33, pin 1 and 2. g Turn the gas condensing system boiler ON/OFF switch off and back on again. |
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| F.7 | No DHW heating | Lead break, storage tank temperature sensor | g Check DHW setting in the commissioning assistant and correct if necessary. g Check storage tank temperature sensor (plug 5, wires 3 and 4). g Measure voltage at sensor input on electronics module. Target value: 3.3V– with sensor disconnected. Replace faulty component if necessary. |
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| F.8 | No DHW heating | Short circuit, storage tank temperature sensor | Check storage tank temperature sensor (plug 5, wires 3 and 4). Replace faulty component if necessary. |
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| F.13 | Regulates as if the out- side temperature were 32°F (0°C). | Lead break, outside temperature sensor | g Check the operating mode setting in the commissioning assistant and correct if necessary. g Check outside temperature sensor and connection to sensor (external plug, contacts 1 and 2). g Measure voltage at sensor input on electronics module. Target value: 3.3V– with sensor disconnected. Replace faulty component if necessary. |
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| F.14 | Regulates as if the out- side temperature were 32°F (0°C). | Short circuit, out- side temperature sensor | Check outside temperature sensor and connection to sensor (external plug, and contacts 1 and 2). Replace faulty components if necessary. |
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| F.49 | Burner in a fault state | Flue gas temperature sensor disconnection | Check flue gas temperature sensor. Reset the boiler. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.50 | Burner in a fault state | Short circuit, flue gas temperature sensor | Check flue gas temperature sensor. Reset the boiler. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.59 | Burner locked out | Power supply, low voltage | Check mains voltage. If voltage is correct and the fault occurs repeatedly, replace the fan unit. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.62 | Burner in a fault state | High limit safety cut- out has responded. | g Check heating system fill level. g Check pre-charge pressure in diaphragm expansion tank. Adjust to required system pressure. g Check whether flow rate is sufficient (flow sensor and circulation pump). g Check 3-way diverter valve function in actuator test. Vent the system. Reset the boiler. |
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| F.63 | Burner in a fault state | Flue gas temperature limiter has responded. | g Check heating system fill level. g Check pre-charge pressure in diaphragm expansion tank. Adjust to required system pressure. g Check whether flow rate is sufficient (flow sensor and circulation pump). g Check 3-way diverter valve function in actuator test. Vent the system. Reset the boiler once the flue system has cooled down. |
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| F.67 | Burner in a fault state | Ionization current lies outside the permissible range | Check gas supply (gas pressure), check gas solenoid valve and inlet strainer. Check ionization electrode: g Clearance to flame body assembly. g Check electrode/flame body assembly for contamination. If specified measures don’t help, replace fan unit. Reset the boiler. |
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| F.68 | Burner in a fault state | Flame signal is already present at burner start. | Close the gas shut-off valve. Remove connecting cable of the ionization electrode. Reset the boiler. If the fault persists, replace BCU burner control unit: See page 89. |
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| F.69 | Burner in a fault state | Ionization current lies outside the permissible range | Check ionization electrode: g Check whether insulation block is touching electrode ceramic. g Check gas solenoid valve: Activate “Minimum heating output” for approx. 4 min in actuator test. If this causes a fault to occur, replace BCU burner control unit. g In the actuator test, switch from “Minimum heating output” to “Maximum heating output”. If this fault occurs during modulation, check the intake screen for contamination. Replace the fan unit if necessary. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.70 | Burner in a fault state | Internal error burner control unit | Replace BCU burner control unit: See page 89. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.71 | Burner in a fault state | Fan speed too low | g Check fan for blockage. g Check the gas type and flue system setting in the commissioning assistant and correct if necessary. Reset the boiler. |
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| F.72 | Burner in a fault state | Fan idle state not reached | Reset the boiler. If fault occurs repeatedly, replace fan unit. |
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| F.73 | Burner in a fault state | Internal communication error | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.74 | Burner locked out. Internal circulation pump off. No central heating and no DHW heating. |
Water pressure too low | Top up with water. Vent the system. If the fault occurs repeatedly: g Check system pressure sensor with external manometer. g Check diaphragm expansion tank pre-charge pressure. g Check settings for target system pressure and range. |
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| F.77 | Burner in a fault state | Data memory burner control unit | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.89 | No central heating and no DHW heating | Internal circulation pump blocked | Check circulation pump. Replace if necessary. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.142 | Burner in a fault state | Communication error CAN bus | g Check the fan unit for correct function. For this, check the stepper motor of the fan unit (reference run with mains ON). g If the fault still persists, visually check the plug-in connections and cables of the CAN bus. g Check further CAN bus subscribers. If fault still persists, replace the fan unit. |
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| F.160 | Burner in a fault state | Communication error CAN bus | g If “Connection error” is displayed, check the internal CAN bus subscriber connections. g If only F.160 is displayed, check the connections of the external CAN bus subscribers. g Check the connecting cables for firm seating and corrosion. Reset the boiler. |
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| F.161 | Burner in a fault state | BCU data memory access error | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.163 | Burner in a fault state | Memory access checksum error BCU | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.182 | No DHW heating | Short circuit, outlet temperature sensor (if installed) | Check outlet temperature sensor (plug X1, cores 13 and 14). Measure sensor input on electronics module. Target value: 3.3V– with sensor disconnected |
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| F.183 | No DHW heating | Lead break, outlet temperature sensor (if installed) | Check outlet temperature sensor (plug X1, cores 13 and 14). | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.184 | Burner in a fault state | Short circuit, common supply temperature sensor/ high limit safety cutout | Check the supply temperature sensor/high limit safety cut-out. Check sensor lead. Replace faulty component if necessary. Reset the boiler. |
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| F.185 | Burner in a fault state | Lead break, common supply temperature sensor/high limit safety cut-out | Check the supply temperature sensor/high limit safety cut-out. Replace faulty component if necessary. Reset the boiler. |
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| F.299 | Time/date incorrect | Real time clock setting incorrect | Set the time and date. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.342 | No central heating, no DHW heating | Communication error, BCU burner control unit | g Check connecting cable to the burner control unit plug X4 on BCU. g Check all plug-in connections and cables of the internal CAN. g Remove all plugs except X4, X2, X16 and X18 from the BCU burner control unit. Check whether fault persists. Note: Several other fault messages will be added due to the removed plugs. Ignore these. If fault message F.342 is no longer shown, reinsert the plugs one by one and establish which component is faulty. Reset the boiler. |
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| F.345 | Burner locked out, automatic enabling after boiler cool down. Independent restart. | Temperature limiter has responded. See boiler specification. |
g Ensure adequate heat transfer. g Check heating system fill level. g Check pre-charge pressure in diaphragm expansion tank. Adjust to required system pressure. g Check whether flow rate is sufficient (flow sensor and pump). g Check 3-way diverter valve function in actuator test. Vent the system. If the fault occurs during DHW heating: Check DHW tank or plate heat exchanger for contamination and scaling. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.346 | Burner in a fault state | Ionization current calibration error | g Check the gas supply pressure. g Check gas solenoid valve strainer on the inlet side for contamination. g Check ionization electrode for contamination. g Check flue system. Remove flue gas recirculation if necessary. g Check the connecting cable to the fan unit. g Check whether condensate is backed up. Reset the boiler. |
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| F.348 | Burner in a fault state | Gas modulation valve | If several boilers are connected to a common flue system: Check whether “Multiple connections” is set in the commissioning assistant. Check the flue system for unrestricted flow. If the fault persists, replace the gas fan unit. |
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| F.349 | Burner in a fault state | Air mass flow rate not detected correctly in fan unit. | g Check for dust contamination in the ventilation air. g Check flame body assembly for contamination. Reset the boiler. If the fault occurs repeatedly, replace the gas fan unit. |
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| F.350, F.351 | Burner in a fault state | Ionization current lies outside the permissible range | Replace BCU burner control unit: See page 89. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.352 | Burner in a fault state | CO limit within boiler exceeded | Check entire flue gas path for the following: g Flue gas recirculation g Leaks g Flue gas back pressure caused by water pocket (if flue system fall is insufficient) g Constrictions g Blockages Repair flue system if necessary. Reset the boiler. |
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| F.353 | Burner shutdown with restart if demand exists | Insufficient gas supply, burner output reduced | Check the gas supply. Optically check input-side screen in the gas solenoid valve for contamination. Reset the boiler. |
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| F.354 | Burner in a fault state | Gas modulation valve tolerance outside permissible range | Replace gas fan unit. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.355 | Burner in a fault state | Analogue signal reference check: Flame signal is already present at burner start. | Replace BCU burner control unit: See page 89. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.357 | Burner in a fault state | Insufficient gas supply | g Check that the gas shut-off valve is open. g Optically check input-side screen in the gas solenoid valve for contamination. g Test static gas pressure and gas flow pressure. g Check that on-site gas line is correctly sized. Note: If the building pressure regulator has a leak, you may notice rising pressure when the burner is idle. If the static pressure doesn’t drop, check cable to the fan unit. Check whether the coil resistance at the fuel valve is approx. 4 k Ω (plug 35, contact 2 and 4). Check the ignition electrode for damaged insulation. Reset the boiler. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.359 | Burner in a fault state | No ignition spark | g Check whether the ignition electrode insulation is damaged. g Check for a voltage of 120V~ at the ignition module during the ignition phase. If not, replace the BCU burner control unit. g If 120V~ is present at the ignition module but there is still a fault, replace the ignition module. g Check connecting cables and leads from ignition module and ignition electrode. Reset the boiler. g Check the condensate system for a backup or clog, replace the insulation blocks, electrodes and flame body if necessary. |
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| F.361 | Burner in a fault state | Flame signal is not present or insufficient at burner start. | Check ionization electrode and connecting cable. Check plug-in connections for loose contacts. Note: Deposits on the electrodes indicate foreign bodies in the combustion air. Check the installation room and flue system for causes of the deposits. For example: Laundry detergents, cleaning agents, toiletries, deposits in the ventilation air supply (chimney). Reset the boiler |
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| F.366, F.367 | Burner in a fault state | Gas valve electricity supply does not turn off. | Replace BCU burner control unit: See page 89. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.369 | Burner in a fault state | Flame loss immediately after flame formation (during safety time) | Check gas supply (gas pressure). Check balanced flue system for flue gas recirculation. Check ionization electrode: g Clearance to flame body assembly. g Contamination on electrode. Reset the boiler. |
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| F.370 | Burner in a fault state | Fuel valve or modulation valve will not close. | Reset the boiler. If fault occurs repeatedly, replace fan unit. |
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| F.372 | Burner in a fault state | Repeated flame loss during calibration | g Check ionization electrode and connecting cable. g Check plug-in connections for loose contacts. g Check flue system. Remove flue gas recirculation if necessary. g Check system for condensate backup. g Visually inspect gas solenoid valve inlet and strainer on the inlet side for contamination. Note: To prevent water damage, detach fan unit before removing the burner. Deposits on the electrodes indicate foreign bodies in the combustion air. Check the installation room and flue system for causes of the deposits. For example: Laundry detergents, cleaning agents, toiletries, deposits in the ventilation air supply (chimney). If flame body assembly and ionization electrode have been replaced, also clean fan unit, gas/air channel and Venturi extension. Reset the boiler. |
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| F.373 | Burner in a fault state | Heat transfer too low during calibration Temperature limiter has shut down. | g Ensure adequate heat transfer. g Check circulation pump for faults, scale or blockages. g Check 3-way diverter valve function in actuator test. Vent the system. g Check function of flow sensor. Reset the boiler. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.377 | Burner in a fault state | Post-processing of ionization adjustment: Stabilization conditions for post calibration not met |
Check gas type setting. If fault recurs, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.378 | Burner in a fault state | Flame loss during stabilization or operating phase | g Check gas supply (gas pressure). g Check flue gas recirculation. g Check for contamination of ionization electrode and flame body assembly. Reset the boiler. |
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| F.379 | Burner in a fault state | Flame signal not present or insufficient | g Check ionization electrode connecting cable for damage and firm seating. g Check ionization electrode; replace if necessary. Reset the boiler. |
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| F.380 | Burner in a fault state | Flame loss immediately after flame formation (during safety time) | Check gas supply (gas pressure). Check balanced flue system for flue gas recirculation. Check ionization electrode and flame body assembly: g Clearance to flame body assembly g Contamination on electrode Reset the boiler. |
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| F.381 | Burner in a fault state | Flame loss during operating phase | Check gas supply (gas pressure). Check balanced flue system for flue gas recirculation. Check ionization electrode and flame body assembly: g Clearance to flame body assembly. g Contamination on electrode Reset the boiler. |
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| F.382 | Burner in a fault state | Error counter has exceeded limit. | Reset the boiler. Work through fault analysis using fault history. |
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| F.383, F.384 | Burner in a fault state | Possible contamination of gas line | g Check gas line for contamination. g Check the gas supply pressure. g Replace gas fan if necessary. Reset the boiler. |
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| F.385 | Burner in a fault state | Short circuit, signal 1, ionization current. BCU burner control unit faulty. | Check ionization electrode and connecting cable. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.386 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.387 | Burner in a fault state | Ground fault, ionization current. BCU burner control unit faulty. | 1. Check system for condensate backup. g Check the condensate drain and siphon trap. g Replace insulation blocks, electrodes and flame body assembly if necessary. Note: To prevent water damage, detach fan unit before removing the burner. Protect electronic components from escaping condensate. If there is no condensate backup, take the following steps: 2. Check ionization electrode and connecting cable. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.388 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| Displayed fault code | System characteristics | Cause | Measures | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.395 | Burner in a fault state | IO electrode ground fault, BCU burner control unit faulty | Check ignition electrode for ground fault. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.396 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.399 | Burner in a fault state | IO electrode ground fault, BCU burner control unit faulty | Check IO electrode for ground fault. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.400 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.401 | Burner in a fault state | IO electrode ground fault, BCU burner control unit faulty | Check IO electrode for ground fault. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.402 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.403 | Burner in a fault state | Ionization electrode ground fault, BCU burner control unit faulty | Check IO electrode for ground fault. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.404 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.405 | Burner in a fault state | Ionization electrode ground fault, BCU burner control unit faulty | Check IO electrode for ground fault. If fault persists, replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.406, F.408, F.410 |
Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.416 | Burner locked out | Flue gas temperature sensor incorrectly positioned | Fit flue gas temperature sensor correctly. See “Repairs”. Carry out mains reset after fault has been remedied. |
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| F.417, F.418 | Burner in a fault state | BCU burner control unit faulty | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.425 | System operating normally; calculation not working | Time synchronization failed | Set the time. If external time is used, check parameters 1504 and 508. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.430 | Normal operation in line with target values of boiler | Communication error gateway | Check gateway module connecting cable and power supply. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.446 | Burner in a fault state | Deviation, boiler supply temperature sensor/ high limit safety cutout | Check the supply temperature sensor/high limit safety cut-out. Check plug-in connection and lead to sensor. Reset the boiler. |
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| 79 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Troubleshooting | Vitodens 100-W, B1HE/B1KE Combi Installation/Service | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fault Messages (continued) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Displayed fault code | System characteristics | Cause | Measures | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.447, F.448 | Burner in a fault state | Deviation, ionization current signal | Replace BCU burner control unit: See page 89. Reset the boiler. |
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| F.449, F.450, F.451, F.452 |
Burner in a fault state | Error in scheduled program run monitoring | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.453 | Burner in a fault state | Synchronization error, sequence | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.454 | Burner in a fault state | Incorrect software version | Flash the correct software version for the BCU burner control unit. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.455 | Burner in a fault state | Error in program run monitoring | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.456 | Burner in a fault state | Error in program run monitoring | Reset the boiler. Check fan for sluggishness. In the case of severe contamination or grinding noises, replace fan unit. |
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| F.457 | Burner in a fault state | Fan sluggish or blocked. | Reset the boiler. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.463 | Burner in a fault state | Contaminated combustion air, flue gas recirculation |
Boiler installation and service instructions Check flue system for contamination and flue gas recirculation. Clean flue system if necessary. Reset the burner. Note: Deposits on the electrodes indicate foreign bodies in the combustion air. Check the installation room and flue system for causes of the deposits. For example: Laundry detergents, cleaning agents, toiletries, deposits in the ventilation air supply (chimney) If flame body assembly and ionization electrode have been replaced, also clean fan unit, gas/air channel and Venturi extension. Reset the boiler. |
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| F.464 | Burner in a fault state | Ionization current too low during calibration. Differential compared to previous value not plausible. | g Check ionization electrode and connecting cable. Check plug-in connections for loose contacts. g Check whether there is a lot of dust in the ventilation air (e.g. from construction work). g Check flue system. Remove flue gas recirculation if necessary. g Check system for condensate backup. Reset the boiler. Note: To prevent water damage, detach fan unit before removing the burner. Protect electronic components from escaping condensate. If fault is permanently present, replace the BCU burner control unit: See page 89. Note: Deposits on the electrodes indicate foreign bodies in the combustion air. Check the installation room and flue system for causes of the deposits. For example: Laundry detergents, cleaning agents, toiletries, deposits in the ventilation air supply (chimney) If flame body assembly and ionization electrode have been replaced, also clean fan unit, gas/air channel and Venturi extension. |
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| Displayed fault code | System characteristics | Cause | Measures | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.467 | Burner in a fault state | Gas supply insufficient during calibration. Contaminated or insufficiently sized gas line. |
g Test static gas pressure and gas flow pressure. g Check that on-site gas line is correctly sized. g Visually inspect gas solenoid valve inlet and strainer on the inlet side for contamination. Reset the boiler. Note: Contamination from a brazed gas line, for example, can block up the gas solenoid valve strainer on the inlet side. |
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| F.468 | Burner in a fault state | Ionization current too high during calibration | Check gap between ionization electrode and flame body assembly. Check whether there is a lot of dust in the ventilation air (e.g. from construction work). Reset the boiler. Note: Deposits on the electrodes indicate foreign bodies in the ventilation air. Check the installation room and flue system for causes of the deposits. For example: Laundry detergents, cleaning agents, toiletries, deposits in the ventilation air supply (chimney) If flame body assembly and ionization electrode have been replaced, also clean fan unit, gas/air channel and Venturi extension. |
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| F.471 | No call for heat | Lead break or short circuit | g Check system (plug dD). g Check lead and plug-in connection. g Measure, to see if supply voltage to sensor is 5V–. |
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| F.473 | No call for heat | HMU heat management unit communication error | Check connecting cable between BCU burner control unit and HMU heat management unit. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| F.474 | Burner in a fault state | Error in scheduled program run monitoring | Reset the boiler. If fault recurs, replace BCU burner control unit: See page 89. |
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| F.527 | Burner in a fault state | Incorrect parameter set, HMU heat management unit | Overwrite (flash) the HMU heat management unit with the correct parameter set: See page 89. |
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| F.528 | Burner in a fault state | Incorrect parameter set, BCU burner control unit | Overwrite (flash) the BCU burner control unit with the correct parameter set: See page 89. |
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| F.540 | Burner in a fault state | Condensate backup in the heat cell | g Check system for condensate backup. g Check the condensate drain and siphon trap. g Replace insulation blocks, electrodes and flame body assembly if necessary. Note: To prevent water damage, detach fan unit before removing the burner. Protect electronic components from escaping condensate. Reset the boiler. |
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