45 / E45
Control is unable to start Cooling mode test because indoor heat has been turned on by thermostat; set thermostat to off position
This code typically points to
- Heat provided by secondary heating source
Next checks to confirm
- Turn off furnace/heater using thermostat before operation
Escalation
Test mode blocked
Reset behavior
Clears after thermostat is set correctly and indoor heat is off.
Informational
No action needed