58
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 >
Notifications
Component or System Operational State and Troubleshooting Tip
How to clear alert code
35
Service
Urgent
Incorrect
Operation Of
Device
• Message sent by thermostat to unit after more than 15 minutes asking for initiating heating or cooling with no response from unit.
• Message sent by thermostat to unit after more than 15 minutes asking for termination of heating or cooling with no response from unit.
Result
A communicating device in the system has been disabled due to a fault/lockout code in the unit’s control.
Another possible cause is electrical noise interference affecting the communicating system when the compressor contactor coil is
energized.
Corrective Action:
•
Communicating system: Wire a transient voltage suppressor in parallel with the compressor contactor coil terminals on the outdoor
unit.
•
Non-communicating outdoor unit: Wire transient voltage suppressor (
89W72
) in parallel with compressor contactor coil or across the
Y1 and C terminals on the indoor control board.
NOTE:
See service and application note
IAQ-10-01
for further details.
Transient Voltage Suppressor Part information: Made by Little Fuse, part number
5KP43CA
bidirectional Transorb aka TVS Diode.
Please contact your FTC or inside technical support for help in acquiring the transient voltage suppressor if not available in your local
electronics store.
36
Service
Urgent
Heating when
Not Requested
The system has been heating for at least 15 minutes without a demand for heating.
•
Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to
menu
>
settings
>
advanced settings
>
dealer control center
>
diagnostics
and press the
start diagnostics
button.
•
Check for other alert codes that may be preventing the system from operating as expected.
• Check all heating equipment to determine cause of heating demand.
• Recycle power.
Automatically clears when the
system detects that the issue no
longer exists.
37
Service
Urgent
Cooling when
not Requested
The system has been cooling for at least 15 minutes, without a demand for cooling.
•
Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to
menu
>
settings
>
advanced settings
>
dealer control center
>
diagnostics
and press the
start diagnostics
button.
•
Check for other alert codes that may be preventing the system from operating as expected.
• Check all cooling equipment to determine cause of cooling demand.
• Recycle power.
Automatically clears when the
system detects that the issue no
longer exists.
