Question about Ruud UBHC Air Conditioner

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I have a Ruud Achiever 90 plus furnace. There is a random ticking noise coming from the furnace. It comes and goes at random, even when the thermostat is set to SYSTEM OFF. I removed the panel and found that the noise is coming from a relay on the main curcuit board that trips on and off. The relay is a component marked on the board as "K5". It is a Potter & Brumfield T9AV1D12-22. Does anyone have any idea what might cause this relay to intermittently trip like this?

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  • Todd Reeve Nov 13, 2010

    I've started down that path....a few early mornings ago when I was awoken by that infernal ticking, I pulled the t-stat (a Honeywell FocusPRO TH6220) off of the wall and the ticking kept going so I think it's safe to say that it's not that. All of the connections at the t-stat and inside the furnace are secure, so I think your feeling that it's the main board is correct.

    It's only a year and a half old....still has the parts warranty but no the labour. Time to call in the service tech I guess.

    Thanks for you input.

  • Todd Reeve Nov 14, 2010

    Hmm, I'll have to check those things out. Thanks for the tips. I'll let you know how I made out.



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To eliminate the t-stat and wiring I would unhook the t-stat wires (of course mark them first) and see if it still does it...

If so, then the problem is interal in the furnace...

then, wiggle wires in the furnace to see if you can isolate the problem to a wire or connection....

My first gut feeling though is that your main circuit board is going bad....I think you will have to replace it...


Posted on Nov 12, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Nov 13, 2010

    I have seen nails in the t-stat wire that wait a long time to start to cause trouble....
    also have seen wire that the insulation started to break down and cause problems similar to that....

    One other thought....check grounding at the main electrical panel.....poor grounding also does funny things to those boards....



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