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Atwood hydroflame gail 9-28-13  
Furnace will lite from thermostats then go out. If you bypass thermostat @ furnace it lites & burns fine. Ac works fine from thermostat. Is it the thermostats? Where do I get s 6 wire thermos that wont break the bank. Having 2 replace system monitor to.
Re: atwood hydroflame BUBBA THE BUS TECH 9-30-13  
A guess based on experiance: It is quite possible the T stat is good.

With the thermostat installed the AC relay box in the roof controls the furnace. The AC control box requires the furnace to provide 12 volt power to operate. The relay that controls the furnace can go bad, we see 6 or 7 a year.

I have installed a second t stat to run the furnace but you need to wire it to "Bypass" the AC controls while leaving the AC control box hooked up.

This will become more common as The old AC controls become "No Longer Available". Dometic for instance has just made all previous Tstat and control systems "Obsolite".
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