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    drburdi's Avatar
    drburdi Posts: 7, Reputation: 1
    New Member
    		  
    #1

    Feb 14, 2010, 01:40 PM
    Rheems 80+ forced air heater turns off
    Rheems 80+ forced air heater turns off within a minute. If I turn off thermostat for few minutes and turn on again it will start but turns off in a couple minutes. What can I test to find problem?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Feb 14, 2010, 01:49 PM

    Try cleaning the flame senser
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #3

    Feb 14, 2010, 01:58 PM

    Check the status light(s), if present. A code label should be attached to one of the front panels, or the circuit board housing.
    drburdi's Avatar
    drburdi Posts: 7, Reputation: 1
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    #4

    Feb 14, 2010, 07:24 PM

    Can't see any status lights.
    Flame sensor's function? Isn't it to turn on the flame so if furnace does start but will not continue beyond few minutes, something is sensing something is getting too hot? A temperature sensor, but where?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #5

    Feb 14, 2010, 07:32 PM

    Flame senser is just that, it senses the flame. If the flame senser is dirty, the unit will work spuradically.

    Try this, remove the covers of the furnace, and then push in the blower door safety switch and let us know if you see any status lights on the control board
    drburdi's Avatar
    drburdi Posts: 7, Reputation: 1
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    #6

    Feb 14, 2010, 10:23 PM

    Couldn't find any status lights. Have to go to bed now. Will look tomorrow and get back here. Thanks for the suggestions.
    drburdi's Avatar
    drburdi Posts: 7, Reputation: 1
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    #7

    Feb 15, 2010, 08:50 PM

    Found the flame sensor next to the pilot light thermocouple and cleaned both. Still the same problem. Forgot to mention that draft motor continues with pilot light on but heating gas flames turn off after couple minutes of blowing heat. Can't find any sensor lights. The furnace is over 15 years old so maybe they did not install such then. What else can I test?
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