Hello All,
I hope some expert on here can help me with this strange problem I've been having for a few years now. I have a Residential Carrier HVAC 58GSC065 with a NEST thermostat controller. During winter time, I would set my heater to kick on when it is below 68F in the evening. And during the night, I set the thermostat to 64F, so if the temp in the house drop below 64F, the heater would kick on to warm up the house. In the morning before everyone wakes up, the heater would kick on to 68F again.
My problem is that most of the time 90-95%, the heater would kick on and performs as directed with no issue. Once in a while, it would NOT. The time that it does not turn on, the NEST shows that it requested the heater to turn on. When I go to the furnace, I can hear the PCB from the main controller hissing that it is got the signal from the NEST, but the heater did not turn on. No pilot, no burner. But if I were to turn off the heater and turn back on (or turn down the temp and turn up) via the NEST controller or app, the furnace would then kick on with no problem.
For the life of me, I cannot duplicate this problem because it is only intermittent. I have changed out the pilot, spark ignition control module (ignition/lockout control), main controller board (twice), limit switch, and transformer, but still the same intermittent problem once in a while.
The only thing I haven't change out is the gas valve.
Does anyone know what could be causing this intermittent problem and what else I should try to look into? TIA
I hope some expert on here can help me with this strange problem I've been having for a few years now. I have a Residential Carrier HVAC 58GSC065 with a NEST thermostat controller. During winter time, I would set my heater to kick on when it is below 68F in the evening. And during the night, I set the thermostat to 64F, so if the temp in the house drop below 64F, the heater would kick on to warm up the house. In the morning before everyone wakes up, the heater would kick on to 68F again.
My problem is that most of the time 90-95%, the heater would kick on and performs as directed with no issue. Once in a while, it would NOT. The time that it does not turn on, the NEST shows that it requested the heater to turn on. When I go to the furnace, I can hear the PCB from the main controller hissing that it is got the signal from the NEST, but the heater did not turn on. No pilot, no burner. But if I were to turn off the heater and turn back on (or turn down the temp and turn up) via the NEST controller or app, the furnace would then kick on with no problem.
For the life of me, I cannot duplicate this problem because it is only intermittent. I have changed out the pilot, spark ignition control module (ignition/lockout control), main controller board (twice), limit switch, and transformer, but still the same intermittent problem once in a while.
The only thing I haven't change out is the gas valve.
Does anyone know what could be causing this intermittent problem and what else I should try to look into? TIA
