Question about Amana Comfort Zone 18M33PCEH Air Conditioner

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Not heating Unit works on cooling mode, will not work in heating mode..blows cold air.Does reversing valve have a seperate coil or built in

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I'm a Certified HVAC Technician and have been working in the industry since 1996. I totally agree with Rob. But, I'm a bit confused in that I have read "Problem with Amana Comfort Zone 18M33PCEH Air Conditioner" but then I read "Not heating

Unit works on cooling mode, will not work in heating mode..blows cold air.
Does reversing valve have a seperate coil or built in"

First of all, an AIR CONDITIONER does not have a "REVERSING VALVE" - only a HEAT PUMP has a REVERSING VALVE. If the THERMOSTAT was REPLACED, did the ORIGINAL COLORED WIRES and ORIGINAL TERMINALS get RECORDED onto a piece of paper? It is imperative that the CORRECT COLORED WIRE within the Thermostat is CONNECTED to the "O" which, on MOST HEAT PUMP Thermostats is the REVERSING VALVE and, in MOST cases is the ORANGE wire. In every HEAT PUMP system that my company has installed, I have directed all of my technicians to use the STANDARD wiring COLOR Codes, regardless of WHAT was previously used. That way, when another HVAC Technician is called, he or she can easily troubleshoot and reduce the amount of time spent on the Service Call, thus saving the homeowner $$$ in the long run. Good Luck!!!

Posted on Sep 20, 2012

  • Ed Riggle Sr Sep 20, 2012

    By the way, for MOST Heat Pump Thermostat/System wiring, the following is the "TYPICAL" COLOR WIRING DESIGNATIONS:

  • Ed Riggle Sr Sep 20, 2012

    R = RED = + 24Volts DC from the Transformer ... Y = YELLOW = COMPRESSOR ... G = GREEN = FAN (INDOOR FAN) ... W = WHITE = HEAT ... O = ORANGE = REVERSING VALVE ... C = BLUE = COMMON ... E = BLACK = EMERGENCY HEAT ... And their are SO many OTHER variations ... i.e., W1, W2, RC, RH, Y1, Y2, etc, etc, etc .... again, Good Luck!!!

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Yes, the reversing valve has a separate coil. some energize on cool mode, some on heat mode. Has the thermostat been replaced? I find this a common mistake.

Posted on Nov 04, 2007

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You need to check to see if you have 24 volt signal from thermostat to your reversing valve. To go into cooling mode the reversing valve needs to be energized. Orange is normal color of the reversing valve power supply. On your unit will be a reversing valve which looks like a pipe with 3 pipes attached to one side and 1 pipe attached to the other side. On the side of the the reversing valve will be a coil with a 2 wire connection. This coil needs 24 volts applied to shift unit into cooling mode. In your thermostat wire bundle where it is connected, check for voltage between common and the orange wire. If it does not have 24 volts with the thermostat in cooling mode, you have a break in the line normally a connection on the orange junction inside your air handler or your thermostat orange wire is loose. Keep checking for 24 volts available until you find the source of the loss. If you have 24 volts at the reversing valve, you can check to see if the valve is working by unplugging the 2wire connection on the side of the valve, if it clicks its powered if not and 24 volts available then the coil needs replaced.
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1 Answer

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