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Home > Product Information > NTI Trinity LX Series Trouble Codes
NTI Trinity LX Series Trouble Codes
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Skylar Kaczanowski
Jan 05, 2024
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List of Trouble Codes With LX Series NTI Boiler

 

Summary  and  Diagnostics  Display  –  The  Trinity  Lx  controller  and  Touchscreen  display  provides  detailed operational  and  diagnostic information  for  aid  in  troubleshooting.  When  power  is  applied  to  the  boiler  the initial page displayed is the Summary page. Information presented on the Summary page includes Demand source, Burner state, status of sensors and pumps, and so forth. Any current Alert or Lockout condition is also displayed. Accessible from the Summary page are the Diagnostics pages. Refer to the controller manual for more information.
Lockout and Alert History – The controller maintains a record of the fifteen (15) most recent events for both Lockouts and Alerts. To display the logs, touch the History button on the Summary page (refer to Section 7.0 in Appendix A - Controller and Touchscreen Display Instructions). In any situation where malfunction is suspected,  always  check  the  Alerts  and  Lockouts  history.  Entries  recorded  in  the  history  provide  useful information for determining the cause of the malfunction.
Table 17-1  Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
Display shows “System Disconnected” constantly Communication wire disconnected See, “System Disconnected!” above.    
Faulty Sola controller If 24VAC present at controller terminals J8 1 & 2, check Power LED on controller. Verify that connector J8 is securely plugged into the controller. Recycle power to boiler, if controller does not operate, replace the controller.    
Burner not operating Heat demand satisfied; no call for heat Check Demand and Set points via Touchscreen. Check thermostat and DHW aquastat (if applicable) setting.    
Boiler outlet temperature exceeds “Setpoint - On Hysteresis” Check outlet temperature, setpoint and hysteresis settings via Touchscreen.    
Hold delay or Lockout Check Summary page on Touchscreen for code.    
Burner switch off Check Summary page, if Demand indicates “Burner switch off” go to diagnostics burner test page and switch on.    
Lockout 2 – Waiting for safety data verification Safety parameter(s) has been adjusted Changing settings that are considered safety parameters require “Safety data verification”. Refer to Appendix A.    
Lockout 9 – Flame bias out of range 4-20mA input being overdriven. If using 4-20mA input, check to ensure current is not greater than 21mA.    
Control malfunction Cycle power, if problem returns replace control.    
Hold 27 – Flame rod shorted to ground detected A flame circuit shorted to ground may show up as a flame circuit timeout. Zero-ohm shorts can display as Hold 27. Check to ensure condensate drain is not blocked. Check to ensure no voltage applied to R & T terminals. If using 4-20mA input, check to ensure current is not greater than 21mA.    
Hold 61 – Anti short-cycle Demand off Check demand. Delay is to prevent rapid cycling of burner.    
Hold 62 – Fan speed not proved Normal Operation (Drive to Lightoff) Hold 62 is momentarily displayed prior to burner ignition during the Drive to Lightoff.    
Blown fuse Check Fuse "A", blown fuse prevents blower from operating.    
Wiring defect Inspect blower wiring, ensure connectors at Sola controller and blower are securely attached.    
- Faulty Sola controller
- Faulty Blower		 If Hold 62 persists for 15 seconds or more, while the blower is running, check "Fan speed" indicated on display. If "LOW RPM", "HIGH RPM", “0” or rapidly changing RPM value is displayed, try connecting another Sola controller. If problem remains, replace blower.    
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
Hold 63 – LCI OFF (Limit control input) Replacement control incorrectly configured. LCI must be set to “enable” on all Lx models, excluding Lx150/150E units with a serial number of 49351 or lower and Lx200/400 units with a serial number of 48251 or lower.  See instructions included with replacement controller.    
Lockout or Hold 65 – Interrupted Air Switch OFF No problem, normal operation Hold 65 will normally be displayed momentarily during the drive to light-off.    
Blown fuse Check Fuse "A", blown fuse prevents blower from operating.    
Faulty blower If Fuse “A” is good and blower remains off, check 120VAC supply to blower, if present replace blower.  If blower is on proceed to next step.    
Blocked venting Check for blockage of the exhaust vent.    
Blocked air inlet Check for blockage of the air inlet.    
Disconnected, damaged or blocked tubing Inspect the clear vinyl tubing connecting the air switch + and – ports to the air metering elbow. Condensation or other foreign matter may be obstructing the tubing, preventing the switch from sensing differential pressure caused by air flow through the metering elbow.    
Incorrect air switch setting Contact NTI technical support.    
Faulty air proving switch If venting and air inlet are clear, temporarily jumper the air switch.  If the unit lights and operates smoothly – replace air switch.  If the unit fails to light or lights but runs rough or abruptly shuts down – check boiler internals for blockage. WARNING Only jumper the air switch for diagnosing purposes.    
Tripped High Vent Pressure Switch (Lx300-400 only) The high vent pressure switch will trip when the combustion chamber is blocked.  Clean combustion chamber and reset switch.    
Tripped Thermal Fuse (Lx300-400 only) Check  Thermal  Fuse  on  the  back  of  the  heat exchanger (accessed from the rear of the cabinet). If tripped contact NTI.    
Tripped Door Reset Safety Switch (Lx300-800 only) The Door Reset Safety Switch will trip with the combustion chamber gets dirty or the door insulation fails.  Clean the combustion chamber, inspect the door insulation and reset the switch.    
Incorrect air switch wiring Check that the red and orange wires are connected to quick connect tabs 3 and 1 respectively.    
Hold 66 – Interrupted air switch ON (and blower is off) Incorrect air switch setting Contact NTI technical support.    
Incorrect air switch wiring Check that the red and orange wires are connected to quick connect tabs 3 and 1 respectively.    
Faulty air switch Disconnect red and orange wires from air switch and check for open circuit between terminals 1 &
3. If continuity detected, replace air switch.		    
Hold 66 – Interrupted air switch ON (and blower is on) - Blower problem
- Faulty controller		 Check   low   voltage    wiring   from   blower   to controller.    Check  VDC  signal  from  red–green and  black-green;  if  not  28-32VDC  and  0  VDC respectfully  –  replace  controller.     If  signal  is correct – replace blower.    
Lockout or Hold 67 – ILK OFF Insufficient water pressure (Lx150- 400 only) Ensure  at  least  15PSI  at  boiler  outlet.  Refer  to Supplementary Documentation section 2.0 System Piping.    
                                                                                                                                                         
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
 Lockout or HOld 67- ILK off (continued) External Limit Tripped Indication that an external limit (wired to “LIM”) is   open.     Not   a   problem   with   boiler,   check external limit.    
Insufficient flow for Flow Switch (Lx500-800 only) Check plumbing, ensure circulator is operating.    
Tripped Thermal Fuse (Lx500-800 only) Check  Thermal  Fuse  on  the  back  of  the  heat exchanger (accessed from the rear of the cabinet). If tripped contact NTI.    
Tripped High Vent Pressure Switch (Lx500-800 only) The high  vent pressure switch  will trip  when the combustion chamber  is blocked or venting is too restrictive.   Check venting and  clean combustion chamber.    
Lockout or Hold 79 – Outlet High Limit CH or DHW settings Check  if  CH  and/or  DHW  setpoint  temperature plus off hysteresis exceed “High limit” setpoint – factory setting = 210°F (99°C).    
CH or DHW pump problem See "Inoperative CH or DHW pump" below.    
Incorrect “Outlet high limit” setting Increase  “Outlet  high  limit”  setting;  maximum setting = 210°F (99°C).    
Incorrect “Outlet high limit response” setting (Lx150-400 boiler applications only) Unless deemed  unacceptable by local installation codes, the “Outlet high limit response” should be set to “recycle and hold” to prevent lockout.    
Lockout or Hold 81 – Delta T limit
OR
Boiler making banging or hissing sounds		 Insufficient water flow ·   Check Fuse "A"
·   Check boiler pump.
·   Ensure     plumbing     is     correct.     Refer     to Supplementary    Documentation    section    2.0 System Piping. Check that water pressure is at least 15PSI.
·   Boilers  Only  -  Boiler  heat  transfer  surfaces may be fouled  with scale or magnetite. Clean with Fernox DS-40 Descaler and Cleanser. See Table 10-1.		    
Lockout 82 – Stack limit Dirty heat exchanger Inspect   and   if   required   clean   the   combustion chamber  and/or heat  exchanger. Refer  to  Section
14.0   Annual   Maintenance   and   Inspection   and Section 10.0 System Piping.		    
Incorrect “Stack limit setpoint” Unless  installed  in  Canada  with  PVC  exhaust venting,  set  “Stack  limit  setpoint”  to  maximum setting of 220ºF (104ºC).  In Canada PVC exhaust venting is limited to 149ºF (65ºC).    
Faulty sensor Check  resistance  of  stack  sensor  and  compare  to thermistor resistance chart, see Table 17-2.    
Lockout or Hold 85 – Inlet/Outlet Inversion Limit Pump flowing in the wrong direction Ensure water circulation is flowing into the boiler at the fitting closest to the wall.    
Incorrect factory sensor wiring Disconnect   flue   sensor   cable;   screen   should display  “Hold  95  –  Stack  sensor  fault”;  if  not contact NTI.    
Lockout or Hold 88 – Outlet T Rise limit Insufficient water flow See Lockout or Hold 81.    
Hold 91– Inlet sensor fault Sensor disconnected ·   Verify   that   2-position   Molex   connector   on wiring  harness  is  securely  attached  to  mating connector on inlet sensor.
·   Inspect sensor wiring.		    
Faulty sensor Check   resistance   of   sensor   and   compare   to thermistor resistance chart, see Table 17-2.    
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
Hold 92 – Outlet sensor fault Sensor disconnected ·   Verify   that   4-position   Molex   connector   on wiring  harness  is  securely  attached  to  mating connector on outlet sensor.
·   Inspect sensor wiring.		    
Faulty sensor Check   resistance   of   sensor   and   compare   to thermistor resistance chart, see Table 17-2.    
Hold 95 –  Stack sensor fault Sensor disconnected ·   Verify   that   4-position   Molex   connector   on wiring  harness  is  securely  attached  to  mating connector on stack sensor.
·   Inspect sensor wiring.		    
Faulty sensor Check   resistance   of   sensor   and   compare   to thermistor resistance chart, see Table 17-2.    
Lockout 109 – Ignition failure occurred
Or
Hold 110 – Ignition failure occurred, failure to prove flame after 3 ignition attempts		 Incorrect spark igniter gap or faulty spark igniter Check spark igniter gap – gap between electrodes should be 3/16 to 1/4 inch.    
Spark cable disconnected Ensure   that   the   high   voltage   spark   cable   is securely connected to the spark generator and the igniter  electrode.  Check  that  the  green  ground wire is securely attached to the ¼” quick connect tab on the igniter electrode.    
Insufficient gas line pressure Ensure  the  manual  gas  shutoff  valve  is  open. Refer  to  manual  section  9.0  GAS  VALVE  AND BURNER SETUP.    
Flame rod disconnected Verify  that  the  flame  rod  signal  wire  is  securely attached to the flame rod, which is located bottom center of the burner door.    
No 120VAC to Spark Generator Check  wiring  from  controller  to  spark  generator. With an AC voltmeter measure voltage across J5- 6 and ground (the controller chassis is connected to  the  120VAC  supply  ground)  during  trial  for ignition.    
Faulty Spark Generator During  trial  for  ignition  check  for  arc  on  spark electrode via the observation port located next to the spark electrode in the burner door. If the spark generator  is  receiving  120VAC  and  no  spark  is observed, replace the spark generator.    
No 24VAC to Gas Valve Check the wiring harness for loose or interrupted connections of the gas valve wiring. With an AC voltmeter,  measure  the  voltage  from  controller terminals J5-2 to J4-10. There should be 24VAC present during trial for ignition.    
Faulty Gas Valve The  gas  valve  emits  an  audible  click  when  it switches  on  or  off.  If  the  controller  is  providing 24VAC to the gas valve, and the wiring is intact, it  should  be  possible  to  detect  if  the  valve  is responding.    
Lockout 113 – Flame circuit timeout A flame circuit shorted to ground may show up as a flame circuit timeout. High resistance shorts can display as Lockout 113. Check to ensure condensate drain is not blocked. Check to ensure no voltage applied to R & CH terminals. If using 4-20mA input, check to ensure current is not greater than 21mA.    
Lockout 122 – Lightoff rate proving failed Blower is not turning on See “Blower not operating” below.    
Missing or incorrect blower feedback signal See Hold 62 above.    
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
  Blower is always on See “Blower operating at high speed while burner is off” below.    
Alert 128 - Modulation rate was limited due to IAS was open (Air switch open while burner firing) Blocked venting Check for blockage of the exhaust vent.    
Blocked air inlet Check for blockage of the air inlet.    
Lockout 173 - Pilot relay feedback incorrect
Lockout 174 – Safety relay feedback incorrect		 External Electrical Noise Look  for  sources  of  electrical  noise,  i.e.  a  large motor or multiple pieces of equipment starting at the same time.    
Failing Limit Switch in ILK circuit Check   operation   of   internal   LWCO,   and/or external limit (i.e. devise connected between “R” and “LIM”); replace as necessary    
Hardware failure of Sola controller Reset  power,  If  problem  persists  replace  Sola controller.    
Alert 206 – Lead Lag header temperature was invalid System Sensor not connected If  desired,   install  System  Sensor   and   wire  to sensor     input     connections     “SYSTEM”     and “SENSOR COM”.  Otherwise ignore Alert 206    
Alert 233 – Lead Lag outdoor temperature was invalid See Alert 248      
Alert 248 – CH outdoor temperature was invalid Outdoor sensor not connected The Trinity Lx is factory set with Outdoor Reset enabled.   Connect   outdoor   sensor   or    disable Outdoor Reset.    
Outdoor sensor wiring Check  wiring  of  outdoor  sensor.  Wires  should connect to Low Voltage barrier terminals 11 & 12.    
Faulty sensor Check  sensor.  Should  be  free  of  ice  and  snow. Check   resistance   of   sensor   and   compare   to thermistor resistance chart, see Table 17-2.    
Alert 311 – Run was terminated due to interrupted air flow switch was off Blocked venting Check for blockage of the exhaust vent.    
Blocked air inlet Check for blockage of the air inlet.    
Disconnected, damaged or blocked tubing Inspect  the  clear  vinyl  tubing  connecting  the  air switch  +  and  –  ports  to  the  air  metering  elbow. Condensation   or   other   foreign   matter   may  be obstructing the tubing, preventing the switch from sensing  differential  pressure  caused  by  air  flow through the metering elbow.    
Incorrect air switch setting Contact NTI technical support.    
Blown fuse Check Fuse "A".    
Inoperative CH and/or DHW pump Blown fuse Check Fuse "B".    
Faulty controller If Fuse “B” not blown, and controller is operating, navigate to pump diagnostic on display.  Manually switch  pump  on,  check  for  120VAC  at  pump connection terminal on line voltage barrier strip. If 120VAC not detected, replace controller.    
Faulty pump If 120VAC supplied to pump, and pump does not operate, replace pump.    
Blower operating at high speed while burner off Blower signal cable disconnected ·   Verify that the 5-position Molex connector on the wiring harness is securely connected to its mating connector on the blower.
·   Check that the 4-position Molex connector on wiring  harness  is  securely  connected  to  its mating connector on the controller.		    
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION    
Blower operating at high speed while burner off No 24VAC to controller ·   Check Power LED on controller.
·   Check Fuse "C".
·   With   an   AC   voltmeter   measure   voltage   at terminals J8 1 & 2, 24VAC should be present.		    
Blower not operating Blower power disconnected Verify that the 3-position Molex connector on the wiring harness is securely connected to its mating connector on the blower.    
Blown fuse Check  Fuse  "A"  using  the  procedure  described above. Fuse "A" protects the blower as well as the ignition spark generator and boiler pump.    
Faulty blower Measure  voltage  across  pins  1  &  2  (black  and white  wires)  of  3-position  connector  on  wiring harness.   If   120VAC   detected,   replace   power connector and remove 5-position signal connector. Blower should rotate at high speed. If blower does not rotate, replace blower.    

 

 

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