Question about Ruud UPMC036 Air Conditioner

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Reversing valve issues.

Low Suction pressure. Filter is clean. Coil is clean. Reversing valve is disconnected. It energizes on heat. There is a pin hole in the cap tube off the back side of the coil on the reversing valve. Freon liquid line pressure is good. Freon level is o.k. Do I need to replace the reversing valve? Or can the coil be replaced with a remote sensing bulb to be attached with out solder?

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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

Posted on Jun 01, 2009


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Posted on Jan 02, 2017


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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'm a hvac technician myself looking for some advise

if it is a heat pump you could have a clogged actuator piston or a stuck reversing valve depending on whether the unit is energized in the heating or cooling cycle. Try pulling the wire on the reversing valve coil on and off a few times and that may force it to unstick. There is a lubricant that you can pour directly into the true suction line above the reversing valve itself. Supco oil is the name i believe. Also can try removing the actuator piston at both the condenser and the evaporator and checking to see if there is some trash in the line, especially if the lines were brazed without using nitrogen.

Jan 29, 2013 | Heating & Cooling

1 Answer

System not cooling properly. Two speed compressor

According to the reading sound like compressor is working fine .There are other issue that contribute to no cooling and the main one is dirty filters so check your filter to see if it's dirty and clean or replaced it .
If filter is fine then you might have dirty evaporator or condenser coil so clean those out too .
Does this unit have 2 compressor and if it does is the 2 compressor running

May 22, 2017 | Carrier 38CKC060 Air Conditioner

1 Answer

Normal in cool cycle, very high pressure in heat cycle

Expansion valve on the condensor or possibly overcharged with refrigerant?

Nov 01, 2009 | Goodman Heating & Cooling

1 Answer

I have a heat pump that when turned on the tube get cold and condensation develops but 45 seconds later cooling stops and compressor keeps running. the coil for the reversing valve is not energized, there...

Sounds like low on freon. The suction line will turn cooler upon first start up. Heat pumps do sound scary but you all ready have cked the reverse valve coil, ck the lines in\out temp. If you can ck temps on your suction line vers press. repost if you need more help.

Jul 10, 2009 | Heating & Cooling

1 Answer

Heat Pump and fan work fine, but will not blow cold air on AC setting

The reversing valve coil may be bad or no power to it during cool. Most heatpumps are set to have the coil of the reversing valve energize in the cool mode. The heating mode is the fail safe mode if the rev valve fails to energize. Check this and let me know.

Jun 18, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Reversing valve not switching over to air on heat pump. compressor will come on for about 10 minutes, then shut off. Hot air comes out vent.

Look for any refrigerant leaks - no or low refrigerant can cause problems in both modes. The unit may be going off on low suction.


The unit may be stuck in the heating mode.

Make sure the system is calling for the correct mode (cooling or heating) - some systems are auto, but if you can, select cooling since that is the requested mode. Check for power at the reversing valve inside the condensing unit. If power exists, then the reversing valve is stuck. It could also be the reversing valve solenoid coil, so make sure that isn't bad. There should be a strong magnetic field at the solenoid coil.

If you can hear the reversing valve clicking (moving), check the T-stat and make sure it will switch modes. Also check the reversing valve relay (those can be located in either the indoor unit or condensing unit).

May 25, 2009 | Ruud Matching Split Air Conditioner

1 Answer

Two lennox heatpump 71/2 tons

check the true psi with the line psi to see if same if psi is good in cooling 225 hi and 70 low on 80'day then compressor is fine and i would start checking for temp difference on the reversing valve sometimes this will cause high suction or high discharge psi shift it manually with by energising it be cooling or heating then pull wire and see how it shifts if shifts good then txv on out door unit could be bad what is the psi in heating on the discharge line going to the indoor unit? most prv's are set at about 350 psi r22 as for suction line size its only hot gas in hp mode os no problem their shows in cooling mode as low suction psi ..hope this helps some also make sure indoor coil is clean!....thanks & rate me

Apr 19, 2009 | Ruud UBHC Air Conditioner

1 Answer

Reversing valve

The first thing you need to do is fix the hole in the coil. It will only get worse no matter what you do. The reversing valve is controlled by the thermostat, then to the defrost board, as it has a timer, sensor and all that jazz. As to your question, that is a tricky one. The way I found worked best for heat pumps is to turn it to cool. If its so cold outside that it will not turn on because of an outside thermostat, cover the coil and yourself with a cardboard box or a large tarp. Give yourself some room of course, get a set of gauges that has temp. ring for R-22.Take suction temp. from the line about 1 foot from the compressor, look at the low side of the gauge and find the temperature, not the pressure for R-22. You should have a 20 degree differential. If more than 20, add freon, less remove. This sounds a little odd, but its easy to overcharge heat pumps on the heat mode. The condenser has a sensor that switches on the electric heat if the heat pump is not working. Ice on the condenser is normal on heat mode, that's why there is a defrost board.

Jan 12, 2008 | Heating & Cooling

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