Install Instructions

72
Table 19. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notications
Component or System Operational State and Troubleshooting Tip How to clear alert code
295 Service Soon
ID Blower Over
Temperature
The indoor blower motor is overheating. Indoor blower motor over temperature (motor tripped on
internal protector).
• Check motor bearings and amps.
• Replace indoor blower motor if necessary.
• Check for high duct static.
Automatically clears after blower
demand is satised.
310 Service Soon
Discharge Air
Temp Sensor
Problem
There is a discharge air temperature sensor issue.
• Conrm there is no short or open circuits in the Lennox communicating thermostat connections
to any of the other components in the communication system.
• Compare discharge air temperature sensor (DATS) resistance to temperature / resistance
charts in system component installation instruction.
• Replace discharge air sensor if necessary.
NOTE: Issues with a DATS connected to a damper control module or equipment interface model
will not generate an alert code.
Automatically clears 30 seconds after
condition is detected as recovered or
after system restart.
311
Information
Only-Dealer
GF Heat Rate
Reduced To
Match Airow
The heat ring rate has been reduced to match available airow (cutback mode). This is a alert
code. Furnace blower in cutback mode due to restricted airow.
• Reduce ring rate every 60 seconds to match available CFM.
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
Two-stage controls will reduce ring rate to rst stage.
Automatically clears when a heating
call nishes successfully.
312
Information
Only-Dealer
Reduced/
Airow-Indoor
Blower Cutback
The indoor blower cannot provide the requested CFM due to excessive static pressure. This is a
minor alert code.
• Static pressure has exceeded the capability of the blower motor.
• Possible restricted airow - Indoor blower is running at a reduced CFM (cutback mode).
• The variable speed motor has pre-set speed and torque limiters to protect the motor from
damage caused by operating outside of design parameters (0 to 0.8” e.g. total external static
pressure).
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
NOTE: Blower motor cutbacks will not show alarm code. Duct static pressure reading must be
taken.
Automatically clears when a heating
call nishes successfully.
344
Service
Urgent
GF IFC Relay
Y1 Stuck
Link Relay Problem. Issue could be with possible Y1 relay failure.
NOTE: Relay is located on the IFC (Integrated Furnace Control). If issue continues replace IFC.
Automatically clears ve minutes
after Y1 input sensed OFF.