SOLVED: furnace and AC fan won't turn on
SOLVED: see my response below for details. In short, replacing the thermostat fuse fixed the issue. Hi All, I have a 1997 Terry 30g RV with an Atwood 8531-III DCLP furnace and a Coleman 7300 a...
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SOLVED
Thanks again all. I think I've fixed it. Turns out that the 2A fuse in the thermostat was blown. I replaced it, and I was then able to operate the AC and furnace. However, I noticed that the blower wasn't turning off after waiting 3-4 minutes (this was after I put the thermostat switch to the OFF position).
So I decided to look at the wiring going to the relay on the blower motor. The wiring looked slightly different than the picture that Chris posted. The difference was the very top yellow wire that's connected to the furnace housing. You can see there are 2 slots side-by-side. Mine was plugged into the right one. So I moved it to the left one (to look like the above picture), and now it all seems to work fine. Both AC and furnace kick in and turn off automatically according to the temperature setting on the thermostat.
I don't know why it would've worked ok before if the wiring was incorrect. I'm thinking maybe just that particular connector (the right one) became more corroded than the other (causing a bad connection) over time. I'm going to review the wiring diagram from the manual again, but it appears to be working correctly now.
Thanks to Chris and others for the responses.
Thanks again all. I think I've fixed it. Turns out that the 2A fuse in the thermostat was blown. I replaced it, and I was then able to operate the AC and furnace. However, I noticed that the blower wasn't turning off after waiting 3-4 minutes (this was after I put the thermostat switch to the OFF position).
So I decided to look at the wiring going to the relay on the blower motor. The wiring looked slightly different than the picture that Chris posted. The difference was the very top yellow wire that's connected to the furnace housing. You can see there are 2 slots side-by-side. Mine was plugged into the right one. So I moved it to the left one (to look like the above picture), and now it all seems to work fine. Both AC and furnace kick in and turn off automatically according to the temperature setting on the thermostat.
I don't know why it would've worked ok before if the wiring was incorrect. I'm thinking maybe just that particular connector (the right one) became more corroded than the other (causing a bad connection) over time. I'm going to review the wiring diagram from the manual again, but it appears to be working correctly now.
Thanks to Chris and others for the responses.
