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 > Atwood 8531-IV DCLP Furnace Not Working

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enblethen

Moses Lake, WA

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Posted: 11/17/19 11:43am Link  |  Quote  |  Print  |  Notify Moderator

New members cannot always post photos.
BFL 13 photo should help. The sail switch would be behind the black relay in center of photo.


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Old-Biscuit

Verde Valley

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Posted: 11/17/19 11:46am Link  |  Quote  |  Print  |  Notify Moderator

It is NOT the 'sail switch', NOT the 'limit switch', NOT the on/off-circuit breaker otherwise jumpering the 2 blue wires would have NO affect.

Jumpering the 2 blue wires allows DC circuit be to completed......from thermostat

You stated.....
" I do NOT have continuity between the 2 blue wire when they are disconnected and tstat is calling for heat."
That means the thermostat is the issue............replace it.

See pg 29...thermostat troubleshooting
Blower does NOT run
Service Manual


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enblethen

Moses Lake, WA

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Posted: 11/17/19 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Before replacing the thermostat, again, Locate the furnace output from the thermostat. Should be same blue wires as in furnace. Connect them together and test.

climb.on

Minnesota

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Posted: 11/17/19 12:03pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

It is NOT the 'sail switch', NOT the 'limit switch', NOT the on/off-circuit breaker otherwise jumpering the 2 blue wires would have NO affect.

Jumpering the 2 blue wires allows DC circuit be to completed......from thermostat

You stated.....
" I do NOT have continuity between the 2 blue wire when they are disconnected and tstat is calling for heat."
That means the thermostat is the issue............replace it.

See pg 29...thermostat troubleshooting
Blower does NOT run
Service Manual


Thanks for your help. Just to help me understand how this system works...does a jumper between the blue wires bypass the sail switch, limit switch and the relay up in the air conditioner housing?


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climb.on

Minnesota

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Posted: 11/17/19 12:06pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Before replacing the thermostat, again, Locate the furnace output from the thermostat. Should be same blue wires as in furnace. Connect them together and test.


Not sure what you mean by furnace output. All the wires from the thermostat go up to the relay board area in the air conditioner. It's hard to follow things up there. So the wires at the thermostat are not the same as the wires down in the furnace.

I should be able to jump two wires at the thermostat though...furnace and power wire?

Thanks so much for all your suggestions by the way... I really appreciate it.

enblethen

Moses Lake, WA

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Posted: 11/17/19 12:09pm Link  |  Quote  |  Print  |  Notify Moderator

Jumpering the blue wires does NOT by pass anything other then thermostat.
Look at wiring diagram for the thermostat, it should show which wires is for the furnace. Model of Hunter thermostat?

climb.on

Minnesota

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Posted: 11/17/19 12:16pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Jumpering the blue wires does NOT by pass anything other then thermostat.
Look at wiring diagram for the thermostat, it should show which wires is for the furnace. Model of Hunter thermostat?


Hunter 42999b Here is a post of someone who basically did the same thing I did.

White and red I think.

enblethen

Moses Lake, WA

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Posted: 11/17/19 12:23pm Link  |  Quote  |  Print  |  Notify Moderator

R to W should turn on furnace at thermostat

Old-Biscuit

Verde Valley

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Posted: 11/17/19 12:27pm Link  |  Quote  |  Print  |  Notify Moderator

What Brand/Model is your AC Unit?

Need wiring diagram for the AC to understand how the DC is incorporated with your Furnace.

BFL13

Victoria, BC

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Posted: 11/17/19 12:29pm Link  |  Quote  |  Print  |  Notify Moderator

This reminds me of that thread the other day where it got confusing where he has a heat pump too. The "furnace" wire in his was white.

But not clear how that single white was "energized" to make the furnace run. There was a red wire for power too. I guess somehow the Tstat connected the red and white which then connected the two blues down by the furnace, but not a clue!


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