tripping unit

I have a RUUD Achiever outdoor unit heat pump. My question is, When we have extreme cold weather, my unit will trip out. I have to go outside and push the reset button on the side of the unit. There is no pattern to this, it could run for 10 minutes before I have to push it again or it could be 10 hours. Why could this be happening. I just cleaned the inside filter 2 days ago.

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Oct 23, 2014
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Late answer
by: Ex-HVAC Instructor

Unit could be over-serviced causing it to trip the high pressure (HP) switch. A dirty inside coil or dirty filter may restrict the air flow enough to cause the HP switch to trip. Under-servicing may cause the low pressure (LP) switch to trip (if installed).

Jan 08, 2014
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Tripping breaker
by: Anonymous

My 12yr old heat pump runs fine for a couple of hours, thn trips the breaker. Why is this happening?

Jan 08, 2014
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Do you clean your outside unit...
by: Anonymous

Heat pumps run all year around.Everyday 3 or 4 of the calls are because the unit has not been cleaned.
They have to have air flowing through the outside unit and the inside unit.I clean mine every 4 months.If there is not enough air flowing through
the unit will go off on High-pressure shut down.
It is really hard on the compressor scroll comps can take some liquid but, not much and in the winter they boil the liquid in the outdoor unit to absorb heat.Think about this the liquid that is boiling is colder than the outside air.It takes that and the sends it to the compressor when you pressurize something it gets hot.If there is no air going through it it will not heat that is why it has to defrost at times.It has to be cleaned from the inside out.With the fuse pulled from the whip or box from the outside of the house..

Jan 07, 2014
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Cold weather
by: Anonymous

Extreme cold can be a problem for air source heat pumps. Is your auxiliary heat not working either?

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