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Ruud heat pump model series pca high pressure cut out

Hi, Would the high pressure cut-out trip on a heat pump in heat mode and also a/c mode if the inside air handler fan doesn't come on?The fan on the heat pump does come on but after a couple minutes without the inside fan running the high pressure cut-out kicks out. The temp has been 45-66 degrees latley. I have a Ruud heat pump with a Ruud electric furnace which are over 20 years old. Also the "fan on" on the inside t-stat doesn't turn the interior fan on. Nothing happens. It will run in "auto fan" however.

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5 Suggested Answers

Therinnaiguy
  • 1420 Answers

SOURCE: Ruud Furnace won't turn on

Take of the access panel on the furnace and look for a wiring diagram either on the back of the panel or inside the housing. There will be a diagnostic chart on it that will give you a hint what 2 flashes mean. I think it is a "no Ignition" code. If it is, with the access panel off and the door switch taped in the closed position, the furnace will try to start if the thermostat is calling. You want to look at the control module to see if it is flashing, then you should notice a small fan that pushes out the combustion products start to turn. Then if you look in a small view port, you should see an orange glow followed by a clicking noise at the gas valve. Then you should notice a blue flame in the view port. This flame must stay on for 5-6 seconds or the unit will turn it self off. If one of these do not happen, you will need a technician to troubleshoot it. Check to see if all wires and hoses are tight and in place. Make sure your condensate hoses are not blocked and free of water. Make sure there is no blockage in your vent pipe(s). 

 

Let us know what you found. 

Posted on Oct 12, 2007

the dr
  • 447 Answers

SOURCE: FINDING A DIAGRAM FOR A RUUD AIR HANDLER ON LINE

I dont have axcess to a wiring diagram but i am pretty familiar i know the heater wiring is crazy on these what are you having trouble with??

Posted on Nov 24, 2007

  • 20 Answers

SOURCE: Wiring Diagram

here is a basic wiring diagram for all air cond systems your thermostat consist of treminal r w y and c run a four conductor wire fromm thermostat to ai handler the air handler should allso have eather have red blue white wires or a teminal block marked r w c r stands for red w for white c for comon allso blue run color for color from the thermostat to ai handler with exeption of yellow yellow runs straigth to condenserand retuns in white wire to air handler wich gets conected to comon hope this help[s you

Posted on Jul 23, 2008

Accurate Joe
  • 61 Answers

SOURCE: Electric furnace blows cold air before and after warm air.

It is normal. Your house has to go down a couple more degrees because the heat pump is not working. You can solve this by rewirng you thermostat. Take off the wire that goes to Y and tape off. Then take the wires that are marked w and e or w1 and put the wires to yellow. Do not run ac with it wired like this. If you need more information please post me back

Posted on Nov 29, 2008

  • 1 Answer

SOURCE: Clunk noise Ruud Furnace

I had the same problem, the motor shaft and bearings were going bad. There was about 3/16" travel on the shaft that the blower attaches to. I replaced the motor myself and it runs nice and quiet. I have had that noise that you describe for over 8 years, but it got real noisy about a week ago. I talked to the maintance department about it where I work and they said the motor bearings were probably going bad. They were right, I took the motor out of the furnace and they took it to a parts store and got me a new one $270.00 for it. It is a special motor due to the fact that the frame mounts bolt directly onto the motor housing. Make sure if you do this job yourself that you take the motor to the parts store so that they can match it up. The guy at the store told our maintance man if it didn't require the bolt holes in the motor housing it would have been $100.00 cheaper.

Posted on Dec 24, 2008

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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
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What if your unit is not turning on....but the inside unit is still heating..


Most heat pump systems utilize electric strip heaters as back-up and emergency heat. This will allow the system to continue to produce heat in the event of heat pump failure. If you are having problems getting your heat pump to turn on, you might have a blown line voltage fuse, a tripped circuit breaker, or a high pressure switch tripped. The high pressure switch on a Rheem or Ruud unit is a red button located near the service valves at the outdoor unit. Try pushing the button to reset. Check your indoor air filter and replace as necessary.
I hope you find this helpful. If you continue to experience problems, please let us know and we will dig deeper to help you. :-)

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If this is aheat pump or reverse cycle unit that amps in heating is to high. Should not go over nameplate amps in heat or cool. Sounds like maybe two things. Overcharge and stopped up coil on the inside air handler. The reason for the high amps is in heat the head pressure is higher than normal. So check the coil inside and have the charge checked because that compressor wont run long pulling that much amps over nameplate. Keep in touvh Rus.

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I have to reset the pressure switch continously when I turn on the heat. The temp never reaches what is set on the themostat.


I take it that this is a heat pump. Check your coils and your filter, make sure they are clean. It could be a dirty eveperater coild or dirty filter. It could also be a freon issue (to much freon). Heat pumps are touchy when it comes to Freon pressure. When in cooling mode, it's not that cretical but when in the heat mode, it has to be real close or you will have problems. Normally, the pressure switch is set off due to one of two reasons.
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Does the air handler take a minute or two to start, this would be normal so that it doesn't blow cool air into the house before the unit is warmed up. If not could be the fan relay is weak and needs replacing. As far as the outside unit it sounds like you need to check the refrigerant. In cooling they are 70/150 psi. This should be checked in cooling mode, once you turn it to heating mode the pressures switch bring heat inside the house instead of out. I hope this helps.

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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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