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Thread: Thumping noise from heating system.

  1. #1

    Default Thumping noise from heating system.

    We have a Coleman furnace with a Intertherm outdoor unit {heat pump}. It has a Hunter programable thermostat. It makes a thumping noise sometimes right after turning on, sounds kinda like water hammer. You can feel it in the house but it is so intermittent and lasts only a few seconds that I can never see what the outdoor unit is doing when this happens. When this happens is is usually early morning or at night. Had a service guy out last week and he could not find anything, said if it was his he would just run it. This system is 8 years old. Tempted to try a new thermostat to see if it is causing it to kick in and out. Any suggestions? I want to prevent any harm to the system.

  2. #2
    Join Date
    Dec 2003
    Location
    Kent, WA
    Posts
    8,427

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    What is making the thumping sound -- the outdoor unit, the air handler, the thermostat? Put your hand on each unit when it starts and try to feel the thump. Also feel the refrigerant lines and duct work.
    Mark
    Kent, WA

  3. #3

    Default

    Quote Originally Posted by suemarkp View Post
    What is making the thumping sound -- the outdoor unit, the air handler, the thermostat? Put your hand on each unit when it starts and try to feel the thump. Also feel the refrigerant lines and duct work.
    It is so intermittent that when you get to the inside furnace it has quit. You can feel it in another room when it happens. Just does it a few seconds and quits. I decided tonight to turn off the heat pump and let it run on the electric furnace tonight to see it it stills does it. I am wondering if the thermostat is somehow turning the outside unit on and off make the refrigerant surge. Just a guess right now, going to try to eliminate things one by one.

  4. #4

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    I forgot to add the when it does this the lights are dimming and going bright like something big is turning on and off.

  5. #5
    Join Date
    Dec 2003
    Location
    Welland Ontario
    Posts
    4,782

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    Sounds like you have a loose neutral in your service. Light going bright is a classic symptom of loose neutral. This can be very damaging to electronics.

    You need to have this checked ASAP. Call the POCO and describe the light going bright to them.

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