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Compressor relay keeps cycling on and odfdf on my Rheem Heat Pump

It happens only when it is in heat mode. I had to replace the relay because it burnt the contacts. But while running for heat, after about 15 minutes of running, the relay starts to cycle on and off quickly.

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  • kbar166 Jan 11, 2009

    The relay is only a week old. Brand new. I checked the incoming power to the relay and it is dropping out. Thanks.

  • kbar166 Jan 11, 2009

    There is no relay on the side of the compressor.

  • kbar166 Jan 11, 2009

    Here is another thing to think about. When I first switch over from the electric calrods to the outside compressor, it sometimes takes hours (could be as much as 24 hours but can be as low as 1 hour) before the fast cycling starts. Maybe this will help.

  • kbar166 Jan 11, 2009

    I am using a Fluke meter right now recording the highs and lows of the relay coil. I will let you know after the cycling starts where it is.

  • kbar166 Jan 11, 2009

    Checking voltage right now.

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It is possible if it gets noisier as it gets hotter outside that the condenser coil is dirty or there is a problem with the fan.
To get some idea if this is so you could feel the smaller of the two lines going to the indoor coil.
The smaller line should be in a range of about 100 degF. This would feel like the surrounding temp. If hotter you may have a problem.

Could also be several other things.
Might need to call a tech to install a set of guages to diagnose it for you.

Posted on Jan 11, 2009

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This sounds like a voltage problem! and that is what is tricking the relays! check voltage input witha meter!

Posted on Jan 11, 2009

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Its the voltage problem on the connections that r tripping the relay and its misfunctioning.just check out the voltages and make it proper.if it finds more complicated a technician at your place is advisable. thanks.

Posted on Jan 11, 2009

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Hi
You would need to start by putting system in A/C mode and using a voltage tester check to see if you constant 24 volt at the fan relay COIL ,while calling for A/C.If you lose the 24 volt then your fan relay is OK ( if you have constant 24 volt at the fan relay and motor drops out, replace fan relay.Also check line voltage of the motor ,make sure you have constant 120 or 220 volt (whichever one it is while it's running)also  go to where your getting the 24 volt , and check to see your getting constant 24 volt. Check at the Circuit board next to make sure you have constant 24 volt going to the fan relay . You would need to look at the wiring diagram closely to see what is in series with the fan relay. Also the control board.

In closing look at wiring diagram and start with  fan relay and board.Basically start at fan relay and work back to the board looking for any switch that may open in the fan circuit.

Posted on Jan 11, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 11, 2009

    What I would do is check to see what the fan control is doing. Remove the front furnace panel where the burner is located. In the upper right or left corner is the fan control, it has a silver cover that you remove by squeezing the sides and pull out. you will see a dial marked in 10 deg increments starting at 50 degs and up to 250. There are 3 adjustments tabs , #1 fan off setting, #2 fan on setting and #3 overheat shut off. #1 is normally set to 90 deg, #2 -110 deg, and #3- 190 deg. With the cover off watch the dial to see what the fan control is doing. Not sure about the 2 zone, I assume it’s control dampers.


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It sounds like the compressor relay mounted to the side of the compressor is out. Very common problem on these units. The replacement relay is supposed to be stronger and less likely to give a problem. Remove the relay and shake it. If you hear it rattling inside it is definately burned out.
Do not replace it with a 3 in 1 or kickstart relay. It will work fine for a few months and burn the compressor out. Get the correct replacement part.
Post back to let me know what you find


Thanks.

Posted on Jan 11, 2009

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You need to replace that relay,,,,if its cycling that fast its going to be the relay or the thermocoupler one or the other but in your case i believe its the relay

Posted on Jan 11, 2009

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