Suburban Furnace Problem
So I'm doing battle again with my furnace. Suburban NT34SP. The unit has worked well for the last 16+ years, well except for that whole motor replacement thing 2 years ago. We're in bed and I'm th...
Forum Discussion
@GenoB--I have done this and can't figure out why it fails where it fails. I have 12.6 on the feed into the furnace. I have the same on the power terminal on the board.
When the thermostat calls for heat, I have 12.4 on the blower feed from the board ONLY if the wire to the motor is unplugged. Otherwise I get no voltage and repeated clicking of the relay.
If I unplug the motor lead from the board and power the motor direct with a hot wire, the motor runs.
If I unplug the motor from the board, everything looks normal - One click of the relay and proper voltage to the motor feed. I plug the motor back in and it starts kicking the relay in and out again.
Something is causing the relay to kick out repeatedly instead of hanging in there and passing the voltage to the motor, I just don't know what. Too large of a load for the relay rating?
I'm leaning towards wrong board at this point.
When the thermostat calls for heat, I have 12.4 on the blower feed from the board ONLY if the wire to the motor is unplugged. Otherwise I get no voltage and repeated clicking of the relay.
If I unplug the motor lead from the board and power the motor direct with a hot wire, the motor runs.
If I unplug the motor from the board, everything looks normal - One click of the relay and proper voltage to the motor feed. I plug the motor back in and it starts kicking the relay in and out again.
Something is causing the relay to kick out repeatedly instead of hanging in there and passing the voltage to the motor, I just don't know what. Too large of a load for the relay rating?
I'm leaning towards wrong board at this point.
