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R32 Refrigerant Detection System (RDS) Control Board and Sensor Troubleshooting

This is an important Technical Service Bulletin to be carried out by trained and certified service 
technicians. The intent of this bulletin is to inform our customers of an increase in warranty 
claims that has been identified on the RDS control board and sensor. Through a 90-day report 
data analysis, greater than 80% of the claims have been determined to be “No Fault Found.”

One possible cause being investigated is misdiagnosis of the board or the sensor. Before 
replacing the RDS control board, follow this troubleshooting procedure of the board and 
sensor. The following troubleshooting guide should be used to determine whether there is an
RDS board failure, sensor failure, or normal operation. After applying main power to the 
system, please make sure there are no active thermostat calls for fan, heating or cooling, and 
wait 2 minutes for the system to reach an idle state. During this 2-minute wait, you might see
the blower turning on and off, you might hear relays operating on the control board and see 
LEDs flashing. This is all normal. Please wait for the full 2 minutes before continuing with the 
troubleshooting