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Have an old rheem heat pump split unit. Replaced condenser fan motor and contactor. Compressor and fan both come on when you manually trip contactor, but will not come on from thermostat. Was pretty careful about connecting everything correctly to new contactor. Any suggestions?

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  • Jethro Bodine Nov 09, 2010

    Was tracing low voltage wires to find transformer and found yellow had become disconnected. Problem solved.

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  • 674 Answers

Remove the thermostat face and place a jumper between R and Y. The outside unit should come on. If it doesn't, check for 24vac between R and C or R and Y. If you don't have it then you need to check the transformer. Check for 24vac on the transformer secondary and 120vac on the transformer primary. If you don't have power on the primary, check for a blown fuse or tripped breaker. If you do have power on the primary but nothing on the secondary, you need a new transformer. If the unit does come then the thermostat is the problem.
If the transformer is good and the unit doesn't start when you install the jumper then you have a problem in the outside unit. It could be the contactor coil which you can check with an ohmmeter. It could also be a low or high pressure switch or and overload all of which you can also check with an ohmmeter. Let me know what you find.

Posted on Nov 08, 2010

  • Jethro Bodine Nov 09, 2010

    Was tracing low voltage wire to find transformer and found yellow was disconnected at a splice. Reconnected and problem solved.

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Replace same type Contactor relay (In out door unit) immediately. Hope, it's helpful.

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Hi, and the outdoor condenser fan should not be on at all in the heat mode unless this is a heat-pump!! So, I can see that this is a 3-ton Carrier split system and I haven't pulled up any information on it, only if I need to. But if the indoor unit runs on natural gas/propane, this would not be a heat-pump and the outdoor fan would run only in the cooling cycle. So, if it is not gas fired it is a heat-pump, and yes the outdoor unit should be up and running all year around. On a heat-pump you will have what is called a reversing valve in the refrigerant system that directs the flow of freon in the right direction for the season you are in. Most all heat-pumps will have a heat strip package installed in unit for emergency and aux. heat if compressor lets say fails. You're thermostat will have on it a selector switch, you will see on it these labels, Aux., emergency heat, auto/on/off/heat/cool. You will know from what I have just went through with you what you have. Forgive me for such a long explanation as I like my customers to understand more about there units in question. I could have just said yes or no and thanks? Doesn't work like that for me. I hope this has helped you out. One thing, If you determine this is a heat-pump and the fan is not on when in heat, you may have lost this condenser fan motor? You say both run caps. were replaced, and normally when you loose a run cap for a motor they will open internally, leak, buldge ect. So if this is taking place, if you can yourself take a look at the run cap. Also, make sure you have 220 volts to condensing unit. If not, check breaker probably a 30 amp double pole to see if it has tripped. You will have a disconnect box at the unit and inside there will also be 2 fuses. If you see only a pull out square connect, the fuses are still there but in behind the cover. If you have power and can hear the compressor come on but fan does not, I am positive you will have A faulty run cap, or faulty motor. Kill power to unit and try and slide a metal coat hanger down to prop or blade to see if it spins freely. If it is hard to turn bearings are froze up. If the capacitor seems to look ok, and the motor does spin free, It still may have open windings. Do these checks I have asked of you on power to the outdoor unit. If all is good, Stand in front of the unit and have someone turn the stat on for what season you are in. Lower or raise temp a ways above or below room temp. You should her the contactor close and compressor will start along with the condenser motor.If compressor starts and motor does not, then I would say it has failed and or cap again. When a motor is replaced, the run cap must always be replaced to!! Please get back to me and keep me posted. I will wait to hear what has happened. Good Luck.
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