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We lost one leg of our power last night for about 3 hours, I unplugged everything but our 4 year old coleman furnace. Now I have 120v to it, but nothing works, and I cannot see a code light. Is it on the mother board? What else can I look for? Thanks.

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  • A Miller Mar 19, 2011

    Is this in a camper? Are you certain you are getting 110 volts on both sides of your 50 amp (to both neutral and ground?)? Check with a volt ohm meter to be certain. Have you double checked all the breakers in your power panel?

  • Josh Marxen Mar 19, 2011

    It's in a house. Its a York furnace with a coleman badge. I ran the check in the furnace itself and had 110v from hot to neutral where it splices in from the fuse and switch down to the motherboard. I changed the batteries in the thermostat. The inside of the door has a troublecode list but I have no lights at all.

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If you are in the USA, this is very unusual that you would lose one/half of your power since it comes from the same transformer. Still, you say you have lost 1/2, I have to accept this ... When this condition exists, I would expect that one-half of your main panel is now (was) dead and all 220 volt circuits would not work (since they receive only one leg).

Your York furnace, you do not say if it is gas (electronic or thermocouple) or electric ... I am not familiar with this model. If it is electric, I would expect it runs on more than 220 depending on its capacity. Still, the control panel probably runs on no more than 120 and perhaps 12 or 24 volts. I would be looking for a fuse on the control panel. If you have a volt meter, insure the panel is receiving either AC or DC power. Replace the fuse if required. If there is power there to the control ... but nothing happening in the furnace, there could be a fault on the board. You did say the thermostat is functioning properly.

Some models require a 5 or so minute delay in starting or changing modes or temps ... please keep this in mind though I am certainly not implying this is the the case with your unit.

This is what I have to say ... I am not a heater specialist, though there are experts here who are. If you desire, you can contact any of the experts on line (there is a cost associated with this - message or chat). Simply click on the link that mentions chat with a specialist ... or the link to find a York Heater expert.

When you evaluate this answer, please keep in mind I have tried to help you and suggested to you a course of action to follow beyond my expertise.

Thank you for your interest n FixYa.com and I hope you get your machine going easily, simply and economically.

Thanks.

Posted on Mar 19, 2011

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