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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

R22 unit running at 160/58. Took bulb out climbed to 61 on suction then right back to 58. Replaced txv. Charged to 220 head, suction stays at 60. Clean coil, no filter, good airflow. Ideas?????


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.

Mar 07, 2016 | Air Conditioners

1 Answer

I have a RUUD Heat Pump Model UPPB-024JAZ the outdoor pump stopped working last week. The reset button fixed the issue but whhy does it keep going off.


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
•The outdoor fan motor may be slowing down or stopping due to motor bearings dry or weak run capacitor. Any noise/squealing from motor?
•Too much freon in the system.
•A restriction in the freon system.
•A improperly installed/mismatched system
•A (kynk) in the liquid line(3/8 copper)
•A stopped up or clogged filter dryer
•A dirty indoor coil that has an expansion valve(txv) will run too cold and the valve can close near "seated"
All of these, and more, can cause a HIGH PRESSURE SWITCH to open. When yours open, you have the red button to push which resets it(the switch). I have also found that the plenum(duct box that connects to your indoor unit at the discharge air) is supposed to be tapered to the air opening size of the blower outlet but that's hard to explain. If the plenum size is the same size of your indoor unit, width and depth in the upright position, the your plenum is not "tappered"(goes from one larger size to smaller size where connected to the I.d. unit). In that scenario, the high pressure switch opens during heat operation, not cool. I know, confusing. Try cleaning your o.d. coil first. And try to get an hour of work(or close) for an hour paid. And WORK SAFE!

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1 Answer

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HFC-134a ? Critical pressure is 588.9 a . With a 93 LL temp and 575 head, I would suspect 1. Air in system or 2. Ref. has gone critical.
With a 110 psig suction/85 deg.F and a LL temp of 93 deg.F/125 psig

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1 Answer

I have a 12 year old RUUD heatpump model UJMAA048JK-549 that repeatedly trips the "High Head Pressure Limit" switch at 30 degree temperatures but works fine when the temperature isn't as cold. Is...


ONLY 3 THINGS WILL CAUSE THIS
1) CLEAN THE OUTSIDE COILS WITH A COIL CLEANER AND A HOSE
2) THE FILTER IS DIRTY
3) THE UNIT IS OVER CHARGED
IS THIS A SPLIT SYSTEM OR A WINDOW UNIT THE MOST LIKELY ARE 1&2

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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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1 Answer

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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

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1 Answer

Ruud 12 seer heat pump not heating


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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1 Answer

Home Air Condition cooling problem


Hello. If your outdoor coils are dirty it's a good chance the indoor coils are dirty also. Clean the indoor coils and flush out the condensate line.
I know it's tempting to feel the air and try to decide if the unit is working properly but, you need to use a thermometer and while the unit is running check the temperature at the return air vent and then check the temperature at the supply vent closest to the unit. Remember to let the thermometer set for about 5 minutes before reading.
You should be looking for about 15 degrees F cooling between the return and supply.
If your coils are clean make sure the outdoor fan is operating properly. The air coming out of the outdoor fan should feel warm, almost hot. If not you may need to check your pressures. Good luck and let me know what you find.

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1 Answer

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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