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RE: Heat Pump

I have a heat pump that works fine on cooling but when switch to heating trips on high head pressure it only runs for about 1 minutes.
indoor fan is fine, filter is clean, this is a Ruud Heat pump
thanks

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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

Posted on Oct 21, 2008

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Bryant furnace model FX4C, FY4A with heat pump and a/c will not switch from a/c to heat pump. Only have heat with emergency heat on.


WELL this could be a couple of problems the reversing valve could be stuck either from not enough pressure which would be a leal and low on freon or the unit is off on low pressure switch/high pressure switch from either being low on freon or something restricting it and caused unit to shut down, ive been a servicer for many years and if it gets below 30 degrees outside i would recommend running the e-heat anyway it does cost more money minute for minute. but you will find it will heat alot faster in those colder nights than the heat pump therefore cost is about the same.
as far as not switching over could be low on freon or a stuck reversing valve... is the outside even running in cool mode if not the you may have a tripped pressure switch...good luck

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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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Running high head pressure in heating cycle runs fine in a/c cycle


Check your indoor air filter. When the unit is in heat pump mode the indoor unit is cooling the air, ie. removing the heat from the unit. If the air flow is restricted then the unit will run high head pressure. If the filter is clean then maybe something else is restricting the air flow of the indoor unit. The other possiblity is that the unit is over charged. When in cooling the overcharge will not create the problems that it will in heating mode. The only proper way to charge a heatpump is to remove ALL the refrigerant and then wiegh in the proper amount of refrigerant into the system.

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You may be right in looking at the motor. It uses a different speed on heat than cool. The heat cycle uses low speed, usually red. Some manufactures use blue (medium). Cool uses black, high speed. If you are confident, switch the low speed wire with the high speed and see if this changes anything. If the fan motor isn't the problem, check the other setting (cool) if the overload trips, you may need to look into a new capacitor or compressor, if so, you can install a hard start kit. these are start boosters, and are inexpensice, sometimes they will give another year out of the comp. but I've put them on and they have lasted 5 years.

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