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Old 05-30-2011, 03:44 AM   #1
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thermostat problem

We just bought a 29 ft trailor and when we set it up at home we cant get the thermostat to work.there is no air conditionig,fan,or heat.the breakers seeem to be fine.is there any switches or other fuses somewhere.thanks for any help.doug
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Old 05-30-2011, 07:12 AM   #2
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What brand of thermostat is it? Is it digital? Does it use batteries?

Do other AC appliances work - like the microwave? Or the power convertor?
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Old 05-30-2011, 08:30 AM   #3
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everything else works.it is a slide control and a switch for heat,cool,fan control
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Old 05-30-2011, 09:06 AM   #4
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In saying everything else works, you mean that other AC items work, right?

The only suggestion I have is to flip each and every AC circuit breaker off and then on; sometimes they can appear to be on but actually be off.
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Old 05-30-2011, 11:58 AM   #5
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Welcome to the Jayco Owners forum Doug! What year and model Jayco do you have?
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Old 05-30-2011, 04:31 PM   #6
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Old 06-01-2011, 11:17 AM   #7
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If both the Furnace and Air Conditioner do not work, they may be separate problems. What they do have in common is that they use 12V DC to control them through the thermostat. On my 22FB the DC power also controls the refridgerator. Check you Furnace Fuse. If all is good, you may have a bad ground connection behind the thermostat.

Pop the thermostat from the base to access the connections. You could use a 12V test light between terminals R & B to see if the 12V and ground are reaching the thermostat.

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Old 05-16-2016, 11:17 PM   #8
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Unhappy

I have a similar problem. I have tested the trailer batteries and they are reading 13.5 dc volts then went to the thermostat and get only 0.13 dcv. which I believe is not enough current (12V) to the thermostat? I have checked all the breaker to the heater and air conditioner and fuses in panel and on battery all look good. So, question now is are there any other fuses for the dc voltage that may not be obvious? Everything else that doesn't require dc voltage seems to work in the trailer. Any suggestions on what I should test? A freiend suggest I hook my truck up to the trailer and see if that allows for DC to get to thermostat, may try that tomorrow. For know I have no heat or air period!
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Old 05-17-2016, 07:51 AM   #9
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Quote:
Originally Posted by troutman34 View Post
I have a similar problem. I have tested the trailer batteries and they are reading 13.5 dc volts then went to the thermostat and get only 0.13 dcv. which I believe is not enough current (12V) to the thermostat? I have checked all the breaker to the heater and air conditioner and fuses in panel and on battery all look good. So, question now is are there any other fuses for the dc voltage that may not be obvious? Everything else that doesn't require dc voltage seems to work in the trailer. Any suggestions on what I should test? A freiend suggest I hook my truck up to the trailer and see if that allows for DC to get to thermostat, may try that tomorrow. For know I have no heat or air period!
0.13 of a volt means you have an open circuit. Blown fuse, bad connection, broken or chewed-through wire.

Pull up the harness from behind the thermostat and see of there is a fuse. See if you can chase the wiring back to the converter.

My 1st trailer (it was 25 year old when I bought it) had a bit of corrosion on the connectors at the converter. Also check that the fuse holders are in good condition.
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Old 05-17-2016, 10:52 AM   #10
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You have me curious so I pulled the Atwood wiring diagrams. Depending on which model of furnace you have it could be the breaker at the furnace. For some furnace models the DC power to the T-stat goes through the breaker mounted on the furnace control board. If tripped a re-set should fix it depending on why it tripped in the first place. For other models the 12VDC to the T-stat is from the same circuit as the furnace but tapped ahead of the furnace so would be some other problem in that case.

There is also a little 2A glass fuse in the t-stat. It can be on the front or back of the t-stat. From your description the fuse is probably good but worth a check.
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