Compressor thermal overload open in heat mode

[weebitdry]

Hey guys,
Hoping you could steer me in the right direction. I'm working on a heat pump in heat mode. Pressures are good while I'm there. Indoor coil clean, blower good. Issue is compressor is shutting off on internal overload, around the time when the outdoor temp drops.
House has two systems. I had to change the outdoor txv on the other system. (Pressures were way off on that one, which made it easy to diagnos. Runs like a champ now)
I'm thinking this system is doing the same thing( faulty TXV- closing too much, starving the compressor, causing it to overheat), just not as pronounced as the other system.
Thanks for the help brothers.

[Brent Ridley]

Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

The more info the more help you can get.

[weebitdry]

[QUOTE=Brent Ridley;14865541]Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

Lennox 13HPD series, split, r22, outdoor temp around 60. Pressures little bit higher then operation table showed. Vapor around 55 , liquid around 220

[timebuilder]

Since you are a Pro member, may I recommend to you that this be moved to Pro Residential?

Ask a moderator.

[air1]

What's the amp draw and superheat?

[weebitdry]

Didn't check that. I had my hands full working on other system at the time. Amp draw would be high on a comp that was eventually going to open on overload?

[air1]

Didn't check that. I had my hands full working on other system at the time. Amp draw would be high on a comp that was eventually going to open on overload?

Compressor is overheating for some reason. Usually high amp draw due to compressor bearings failing or lack of cooling due to high superheat.

[BALloyd]

[QUOTE=weebitdry;14865801]

Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

Lennox 13HPD series, split, r22, outdoor temp around 60. Pressures little bit higher then operation table showed. Vapor around 55 , liquid around 220

I take it 55 psig is off the vapour line. Does this unit have a suction service port that will show suction pressure at compressor? If so have you measured it?

[weebitdry]

Yes. 55 psi at suction access port. Runs good during the day. ( or both times I was checking it) problems occur at nite, when temp drops.

[SBKold]

Recip or scroll?

Defrost problem?

[garyed]

Have you run it through a defrost cycle to make sure the sensor is taking it out of defrost correctly?