Bryant 376C (installed 1990)problem:
The heat turned on as scheduled after 20 minutes the blower stopped. The inducer motor kept running (thermostat set temp was not reached, no ignition, no gas valve opening.

Here my attempts to locate the problem:

I used the self test procedure on the control board with these results:
- inducer motor starts 10s OK
- hot surface ignitor 15s OK
- humidifier relay 10s ? I can hear clicking of a relay

- blower motor cooling speed: clicking yes, no motor action
- blower motor heating speed: clicking yes, no motor action

Next I will measure voltage at the relay connecting to the blower motor.

My question:
- is the blower motor dead?
- is the relay for the blower motor dead?
- any problems with the control board?
-... what else am I missing.

Any help would be greatly appreciated.

Greetings

Chris

Do you have 115v on the relay in test mode? If yes you have a bad blower or run capacitor. If no you have a bad control board. New board # CES011057-02. Blower size depends on the BTU of your model.

Thanks for your feedback.

I measured the Voltage at the relay output (red/white/black cable connecting to the blower motor, I assume it is a three phase motor?). I checked the voltage "red to white" and "red to black"
In the test mode it only showed 2V AC (between red and black, L1 and L2 I assume).

Based on your comments I assume that the control board is bad, is there a way to fix the board? Is the relay bad or does an IC need to be replaced?

Greetings

Chris

It's a single phase system. White wire-- common, Black wire-- cooling speed, Red wire-- heating speed. Check for voltage from white to red heating, white to black cooling.