Quote:
Originally Posted by RVHopeful
Thanks for the schematic that helps; It worked Sunday morning I turned it on for the first time this season, ran for one cycle and wouldn't come back on. I am reasonably certain I hear the click in the furnace but no blower comes. I assume if I have 12v at the blower then the Relay is good. I was going to disconnect the leads to the fan if I can and connect it straight to a battery to confirm it runs. There was actually a Mobil RV tech working next door to me Sunday morning and I talked to him and he thought the board was bad, so he popped a new one in and still now blower. He never tested the fan. He claimed there was a controller in the AC which sounded odd to me. He didn't do anything else. Do you think checking blower is next logical step?
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You can do that. If there is a click on the circuit board; that is probably the relay working. I would probably verify 12 VDC on the BLO terminal first (when heat is called for). If everything checks out OK don't discount a bad circuit board - the RV tech's board may have been bad as well.
In my mind; the fact that it worked Sunday but not since also makes the CB a probable suspect as they fail way more often than blower motors. But cover all your bases.
Just for grins, have you reset the circuit breaker/On-Off switch on the furnace?
BTW, attached is a screen shot of the applicable troubleshooting steps (such as they are) from the Atwood Service Manual.