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Thread: Furance itermittent

  1. #1
    Join Date
    Feb 2012
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    417

    Default Furance itermittent

    The problem is that I often have to recycle the power switch to the furnace to make it come back on. What happens when power is switched on (via the emergency power shut off switch) it will power up and heat the house usually up to the pre-set thermostat temperature, but once it hits that temperature and shuts down it may not come back on later until the power switch is shut off and then on again.

    I am going to clean the sensors in the furnace on the weekend, and if you need the make and model I will write it down and repost then. But I am not sure if it is sensor related - an issue with the flame sensor would shut it down immediately and not let it run at all.

    I am intending on replacing with a high efficiency furnace next summer, so I really do not want to put much money into the existing mid efficiency unit right now, but it does become an issue when I want to travel somewhere in the winter.

    If you have any ideas what may be the cause?
    Last edited by dkerr; 04-27-2013 at 07:19 PM.
    Donald Kerr
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  2. #2
    Join Date
    Feb 2012
    Location
    Welland Ontario
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    Default

    Make and model are needed. If there are any flashing lights on the control board those will indicate the problem area. How many flashes are they giving if any?
    Operation Overlord.

  3. #3
    Join Date
    Feb 2012
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    Default

    Thanks, I will check on the weekend and get back to you.
    Last edited by dkerr; 04-27-2013 at 07:19 PM.
    Donald Kerr
    Author and Creator of...
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  4. #4
    Join Date
    Nov 2012
    Location
    Welland, Ontario Canada
    Posts
    48

    Default

    I would check the differential pressure switch. Sounds like the controller still thinks the unit is running. Either clean out the tubes on the pressure switch or check to see that nothing is lodged inside the switch like dirt or corrosion.
    Check the switch by using a VOM meter and activating it by blowing on the switch to see if the contacts open and close.

    Cheers

    John
    John Kuehnl-Cadwell
    Master Electrician
    Datawise Solutions Inc
    www.datawisesolutions.ca

  5. #5
    Join Date
    Feb 2012
    Posts
    417

    Default

    Thanks I will check that, my wife is usually the one that recycles the switch which means I cannot check for error codes until it shuts down, it has not been cleaned for quite some time so I will clean the sensors too. I know it cannot be the flame sensor as that would shut it down immediately but I usually try and clean that with light sandpaper or steel wool and there is a sensor mounted against a metal plate just above the flame jets that can get coated with crap that will also need cleaning. I will do all of that very soon and report back.
    Last edited by dkerr; 04-27-2013 at 07:19 PM.
    Donald Kerr
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  6. #6
    Join Date
    Feb 2012
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    417

    Default

    Just an update, I finally got down to the furnace and...

    1. removed - cleaned with light sand paper the flame sensor rod and then reinstalled it

    2. removed and cleaned one other sensor then remounted it.

    3. tightened at the furnace control box the wires coming from the thermostat.

    4. cleaned the permanent air filter.

    So far since then the furnace has not failed, not sure which item fixed the issue, and it has only been a couple of days so the finding may be pre-mature but hoping it continues fault free.

    Although I never wrote down the exact model number but it did have York Diamond label on it.

    I should add the fact that no error codes where observed.
    Last edited by dkerr; 04-27-2013 at 07:19 PM.
    Donald Kerr
    Author and Creator of...
    http://www.wiringdoneright.com
    Don't Let Your House go up in Flames
    Get It Right the First Time!

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  7. #7
    Join Date
    Jul 2013
    Posts
    6

    Default

    I think it is caused due to pressure inside. You must check the switch by using any kind of checking device that will give you better idea about its working. Try it and then see what does happen?
    If there is problem in switch then try to repair it.
    Last edited by Alec; 11-22-2013 at 01:39 AM.

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