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Old 07-24-2007, 09:39 AM   #1
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12-volt Electrical to heater

I have a 1986 Sovereign and am having trouble with the heater. I am trying to access the circuit breakers for the 12-volt system. It appears that this is located behind the panel the displays the how full the tanks are etc. I don't see how this panel is accessed. My book indicates that circuit 3 goes to the heater so I am trying to start at the source. The last time I tried using the heater the fan didn't even come on. Any advice as to how to diagnosis the Suburban heater would be appreciated.
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Old 07-24-2007, 10:52 AM   #2
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Start at the furnace, you may have a bad connection down there and I've had better luck accessing things in that area than at the control panel. Check the flat 4 way connector at the furnace to see if you have 12V and Ground.
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Old 07-24-2007, 01:59 PM   #3
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Thanks, after I posted my query this morning I realized that the light over the sink / stove area is on the same circuit.
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Old 08-01-2007, 08:23 AM   #4
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Well I have no 12 volts to my thermostat (Comfort Control) I am tracing the problem. I found the 3 amp fuse was blown inside Air Cond box. I have also checked breakers and the breaker at the furnace. Now its a matter of tracing the 12 volts...Trailer is a 97 30 ft Limited
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Old 08-01-2007, 08:36 AM   #5
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Hum, I never looked at the thermostat for voltage. My unit has 4 wires coming out of the heater, 12V, gnd and 2 that go to the thermostat for contact closure. I can tie the two thermostat wires together and the heater will come on.
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Old 08-01-2007, 08:44 AM   #6
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2 of them are blue I think...What 2 do you tie together???
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Old 08-01-2007, 09:28 AM   #7
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I'll have to look when I get home, if my CRS doesn't kick in...
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Old 08-01-2007, 09:40 AM   #8
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Im not the only one that has that??? Hmmmmmmmmmm Forgot what else I wanted to say..LOL..
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Old 08-01-2007, 12:45 PM   #9
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Quote:
Originally Posted by Airboss
2 of them are blue I think...What 2 do you tie together???
The 2 blue wires provde the furnace with the control voltage that tells it to turn on, providing that there is 12VDC to the pos and neg wires that feed the board, which in turn provides the voltage for the blower and the gas valve.

If you have voltage to the board, you can jump the 2 blue wires and the furnace should start and ignite after the purge cycle (approx. 30 seconds). You can do this test right at the furnace. If 12VDC is present at the board and nothing happens, you might have a bad board. You might have to remove it and have it tested. There are other diagnostics to do after that also.

Let us know what happens.
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Old 08-01-2007, 04:05 PM   #10
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Thanks Lewster, I probably was gonna forget to look that up tonight
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Old 08-01-2007, 06:03 PM   #11
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What do you jump the blue wires to??
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Old 08-01-2007, 11:52 PM   #12
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Quote:
Originally Posted by Airboss
What do you jump the blue wires to??
Each other.................
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Old 08-02-2007, 12:26 AM   #13
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got ya..thanks...
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