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Ruud uprl-036jez is tripping on high head pressure. Indoor coil seems to be clean, filter is clean. ref charge is good. Indoor txv was replaced. Fan is on high speed. Hooked up to a 10yo olsen direct vent oil furnace with direct drive blower. This coil is on the return. I have another hp, same model number that is on another oil furnace buts its on the supply side and its doing the same thing but doesn't always trip. The pressure goes really high and then it just drops back to normal. Neither units had problems in cooling mode. I think it may be the txv outside.

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  • boston145 Jan 11, 2009

    I have a new 16 seer Goodman heatpump. It worked great in cooling, but when switched to heat, started going off on high pressure. Filter is clean and coils are clean. Suction pressure is running normal. Tech support said change outdoor txv. I can't understand if that was the case looks like the suction wouldn't be normal.

  • subzero_hc Jan 19, 2009

    If it is still tripping chech you return size and make sure you have enough supply coming off. i have had this problem before. the new 16 seer 410a stuff is very sensitive with air flow in heating mode. a good tip is to always match the system with a matched air handler. some older furnaces can't handle the air flow you may require.

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Check your TXV outside just like you do inside. Strap temperature sensor to outlet of TXV, disconnect the bulb.and let run 5 min, Get temperature reading, then put the bulb in your hand and watch the bulb open up. Next stick in a cup of ice water and watch close.

Check your 4 way valve for proper operation.

Do not hit accept unless you can give 100% good feed back.
If you need more help Please post back.
Let me know how it went.

Posted on Dec 01, 2008

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2 Answers

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Sounds like bad valves in the compressor.
A good indicator is how fast the pressure changes when you shut the compressor off. It should take several seconds for the suction pressure to rise. If it's immediate, then expect a bad valve.

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To start with, the tech charged you for an hours worth of service and only pushed the button. GET YOUR HOURS WORTH!
•The outdoor coil needs to be cleaned. Turn off power at the breaker and t-stat, clean the coil with water hose
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Remove bulb and warm with hand. Watch pressures to determine if txv is functioning. I do believe there is something out now that will free a stuck r.v.. Have not tried this but inexpensive start. At 15 degrees you're liking using heat strips, possibly machine trying to do both. Good Luck

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ONLY 3 THINGS WILL CAUSE THIS
1) CLEAN THE OUTSIDE COILS WITH A COIL CLEANER AND A HOSE
2) THE FILTER IS DIRTY
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those seem to be very acceptable numbers you are stating if this is R22 running in summer temps. Im curious what pressures you are striving for?

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It sounds like the unit is tripping off from high pressure. Check you filter and indoor coil. You may have low air flow inside that is causing the refrigerant pressure to be to high.

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RE: Heat Pump


it would sound likely the check valve assembly for the indoor coil isnt checking corectly . some units have orphis assembly and some have thermostatic expantion valves with check valve . eather way youll not be able to make repairs without correct equipment to open the sealed system and look for the problem . You will have to call in the experts im sorry to say. wish i could have helped more. please leave fead back. thanks

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1 Answer

Ruud ubha


Does the fan on the outdoor condensing unit come on when the compressor does? If so, Is the condenser coil clean so that the airflow from the fan can remove heat from the condenser coil so the compressor won't overheat and trip the internal overload compressor protection circuit? If yes then is the indoor evaporator fan working properly? If yes are your filters clear and evaporator coil clear so that adequate air is flowing over the coil to prevent the compressor low pressure protection circuit from tripping? If so is the refrigerant charge on the system correct- either overcharged or undercharged can trip the compressor protection circuit. By now you should have come across an explanation for your compressor short cycling. If I had to guess I would bet on inadequate airflow over the condenser coil do to a faulty condenser fan motor either not turning at all or turning for a few minutes and then stopping when it overheats. This is likely caused by an unsealed replacment motor being used outdoors and water/rust has accumulated over the winter season and/or the capacitor is bad (in this case the motor may be turning slowly backwards) or just plain old worn out. I hope this helps get you to cold air sometime soon GL!

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