Question about Ruud UBHC Air Conditioner

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Central heat and air system won't shut off

When I turn the ac or the heater on it wont stop running and the heat pump outside dose not shut off either. I have replaced the thermostat and shut it off for about too weeks bur it still funs constantly running and if I have it on cool the coils freeze up in the unit and its starting to bug the heck out of me and I want to get it fixed so it dose not cost me in the long run can you help

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  • mysticphoeni Nov 23, 2008

    When the sun comes up, I am going to go check out the contact relay. Just not quite adventurous to do it in the dark, by flashlight.

  • Anonymous Mar 12, 2009

    I have an Amana PGD42C0902D. Central air will continue to run indefinitely even though my thermostat is turned off. The only way for me to turn it off is by switching the circuit breaker in the electical service panel off. We had an HVAC tech come out to take a look and without turning the circuit breaker on, he just said the circuit board in the unit needed to be replaced. They are charging $300 for the part and $60 for installation. I understand the installation cost, but I'm looking for a second opinion on whether it is the circuit board that needs to be replaced or the contactor relay or if there is a short in the wiring to the thermostat. Thank you.

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Sounds like tstat is wired wrong or possibly the contactor relay has fused shut outside. if you can stop the system from running at the tsat it is usually a problem with the t-stat
if you cannot shut off the outside unit without turning off the power at a breaker than usually the contact relay needs replacement

Posted on Nov 22, 2008

  • cotillionsor Nov 24, 2008

    PLEASE BE CAREFUL TURN OFF TSTAT AND BREAKER TO OUTDOOR UNIT BEFORE OPENING THE PANEL THERE IS 240VOLTS IT CAN KILL. with the breaker and tstat off the pads should be seperated, if not it is fused. sometimes they can release but it will look very burnt and possibly have broken pads.

  • thethorntonh
    thethorntonh Dec 03, 2012

    My guess is the relay switch has gone bad. It's easy to replace, but you MUST shut off all power sources to all unit parts.

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