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...
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Well, I FINALLY got this furnace sorted out. Turns out it wasn't the board after all. I was showing 12.6v on the hot wire, using the furnace chassis as a ground.
What I didn't know, until I stumbled upon it, was that there was no ground being supplied by the 3 wire connector. when I checked voltage between pin 1 and pin 2, I got nothing.
It should have been (pin1) 12v+ and thermostat+, (pin2) 12v-, (pin3) thermostat-. Instead of tearing out the couch to find the faulty wire, I ran 2 new leads from the house battery to the 3 wire connector.
What I realized afterward was the fan was only running on the low side when I hot wired it, due to incomplete grounding. When I gave it the new supply wires, the blower really spun up as it should have.
Sorry I'm so late getting back to this, but life got in my way with Dr appts and the such.
I hope this helps somebody in the future to not make the same mistakes as me :-)
What I didn't know, until I stumbled upon it, was that there was no ground being supplied by the 3 wire connector. when I checked voltage between pin 1 and pin 2, I got nothing.
It should have been (pin1) 12v+ and thermostat+, (pin2) 12v-, (pin3) thermostat-. Instead of tearing out the couch to find the faulty wire, I ran 2 new leads from the house battery to the 3 wire connector.
What I realized afterward was the fan was only running on the low side when I hot wired it, due to incomplete grounding. When I gave it the new supply wires, the blower really spun up as it should have.
Sorry I'm so late getting back to this, but life got in my way with Dr appts and the such.
I hope this helps somebody in the future to not make the same mistakes as me :-)
