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Reverse valve dont work - Goodman Heating & Cooling

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You may have a bad thermostat, Bad coil on the reversing valve or stuck valve. If you have the ability to safely measure the voltage; then you can check for 24vac at the valve while your thermostat is set for cool. the unit does not have to run. Now if your issue is that it will not heat in heat pump mode but will cool then most likely your valve is stuck.

Posted on Jan 27, 2013


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I have a 1999 comfortmaker heat pump i need to know if the revercing valve is normal in heat or cool

not sure if this helps but is how it works...
Comfort Maker energizes the reversing valve in cool. The reversing valve coil should be wired to "O" from the thermostat. Take the wires off the the reversing valve coil, it should switch to heat. If it does not, and the compressor is running, the reversing valve is bad! Replace it.

Note: that clicking sound you hear was the pilot valve in the reversing valve. Within a couple of seconds of hearing that click, it should have reversed. IF it does not, you have a bad valve.

Electricity switches the pilot valve. The pilot valve switches the Freon pressure. Freon pressure switches the reversing valve.
hope this makes sense.
best to you.

Dec 31, 2017 | Heating & Cooling

1 Answer

I have a RUUD UPKA-036jaz heatpump. Anytime the thermostat is set to heat, the reversing valve coil is energized. Even if the unit isn't running. Is that normal?

Most heat pump reversing valves energize in cooling. Does it ever "deenergize". If not its stuck, if it does check programming, may be setup to operate that way. Or possibly wired wrong or wired as straight cool. To answer your question, i dont think that is normal.

If you need further help, reach me via phone at

Nov 08, 2016 | Ruud Heating & Cooling

2 Answers

1977 351 Windsor motor and trans. was put in 1978 ford pickup and will not go in reverse after trans. fluid and strainer kit was put in. whats wrong

I dont like asking obvious questions but,did the trans work prior to installation and did you use type f fluid

Apr 04, 2015 | Ford Cars & Trucks

1 Answer

My 2000 Jimmy only blows hot air out of the vents. I recharged the AC unit but stills blows warm air. The compressor works turns on and off so I dont know what the problem is ??

Aircon systems have a control valve or reversing valve which sticks due to non use.Just where that valve is on the Jimmy I am not to sure,but hope this points you in the right direction.

Jun 19, 2011 | 2000 GMC Jimmy

1 Answer

My 95 neon lost reverse gear completely after driving on an excessively crappy gravel road, where i skimmed a couple of huge dirt piles. The reverse gear worked perfectly the day before, and worked once...

look at the bottom of the transmission for any damage you may have put a huge dent in the pan stoppin fluid from flowwing into the valve for reverse

Apr 05, 2010 | 1995 Plymouth Neon

2 Answers

Chevy blazer wont shift into reverse goes forward only

It dont mean its totally bad ok,go to a trany shop an ask for a pressure port test for reverse,it could be a servopiston wich hold the rear band to hold the planetary,and invert the rotation ok,the foward clutches is the same for reverse,so the clutch is not burnt,it will be the piston,if the tech remove the valve body,they can change that piston and it work again,theres its not necesary to remove trany ok,dont worry,its more dificult to find a sincery people than the job itself.GL

Nov 25, 2009 | 2000 Chevrolet Blazer

1 Answer

Reverse wont engage in my 1998 cevy 10 van

Considering the age and possible milage put upon your transmission at this point in time it is very possible that the valve body is at fault. There are several small ball bearings that position themselves during gear changes. These, over a period of time can accumulate a pasty type of buildup that will not remove it self which causes them to sit incorrectly in there sinks.The sinks therefore become ovalized causing a open seal situation. My suggestion at this time would be a rebuild, if, you think it is worth it. Shop around!! Very important.

Sep 21, 2009 | 1989 Chevrolet G10

1 Answer

I have Coleman Heat pump and i want it to conect as AC only any ideas since i changed furnace to gas and the guys dont know how to conect it back as AC only.

Change out the thermostat to a straight cool gas furnace stat.If the reversing valve energizes in cool, simply hook the reversing valve low voltage wire to the yellow compressor wire. If it energizes in heat do not hook it up to anything.

Jul 20, 2009 | Coleman Heating & Cooling

1 Answer

Reversing valve issues.

You will need to replace the reversing valve. You cannot replace the coil with a remote sensing bulb on this unit. Usually you know when reversing valves get stuck when you are having low side problems with heat working properly

Jun 01, 2009 | Ruud UPMC036 Air Conditioner

1 Answer


- If no voltage output at the thermostat for the supply of heater/reversing valve, then replacement of thermostat is needed (but check the thermostat setting).
- If the voltage output at the thermostat for the supply of heater/reversing valve is present, then then check for heater/reversing valve fuse or overheat protection, and check for defective heater/reversing valve

Jan 03, 2008 | Honeywell Programmable Thermostat Heater

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