Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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My mom's oil furnace runs for about 1-3 minutes and shuts off

She has to shake the stack control box, on her oil furnace, then it will run for a few mintes and shut off. I think its the stack control (it has a red push button)

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  • kenii Jan 31, 2009

    It doesn't make any noise when I press and hold the reset button. I tried taking out the sensor that inserts into mounting phlange and cleaning it off with soapy water. That did'nt help. With the cover off I can manually press down on the switch that turns the furnace on, but it doesn't stay on long or it stays on too long. After that it takes almost an hour before it can be swithed on again. Do you think I need to replace the control. Your mention of the relays and the rest gave me confidence that I am talking about the right part.



    Thanks for your help,

    Kenii

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Loose wire

Posted on Jan 31, 2009

  • coss985 Jan 31, 2009

    sorry about that last post it was meant for a different problem. Is it a Ra117 honeywell (I think thats the old number)? From what i remember there are a few relays inside and more than likely the contacts are bad. If you push the reset and stay there what kind of noises does it make?

  • coss985 Jan 31, 2009

    Although it is a expensive control I think you have isolated the problem to that stack switch. I do not believe they still make a direct replacement but i am relativly certain that a heating parts supplier can get you a rebuilt control for 2/3 the price or less. I don't know the rules here so I hesitate to give out names but you should not have to much trouble locating one.

    Good luck and let me know

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If it continues to run, squeeze the sides of the 'lid' of the box and remove the cover. Inside you'll see a round moveable dial with three pointers, marked 'fan off, fan on, and limit'. The 'limit' should remain at or near the 200 degree setting, the 'fan on' can be anywhere around 140 and the 'fan off' can be anywhere near 100 degrees. It is the 'fan off' position thats giving you the grief.

Turn the thermostat up again and sit there and watch the dial do its thing and yo'll understand better how this control works. Watch it rotate past the 'fan on' setting and observe the fan turn on. Turn the thermostat below room temperature and watch the gas shut off and the dial rotate back towards the 'fan off' setting. If it hangs up again before twisting past the setpoint, you can slightly increase the setting to compensate for the weakening bi-metal element. But just a tiny bit, not a great amount or you will have the fan shutting off with a lot of residual heat still in the heat exchanger. The idea of the delay in shutting off the fan is to remove all that residual heat and transfer it to the house.

There are other brands that utilized 'timed on' fan controls, and there are a few other variances of controllers but what's described above should cover the vast majority of older furnaces.

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