Carrier Wall Pac Series 52S

Hi, Winter is nearing and I noticed heat is intermittent, any suggestion about fixing the problem very much appreciated. This is keeping our sun room warm for the plants. TIA,
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Tony Hwang wrote:

I noticed that unit has a heat pump. Maybe that's the culprit if it's not working normally.
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Bill wrote:

Hi, Yes it does. Last winter in one of coldest night it was running in heat mode and I found out it quit some time during the night. When summer came it was working fine in cooling and when I checked heating then it worked. Now heat won't come on again. I have to pull the unit out from wall mounted sleeve to do some trouble-shooting. One thing I noticed is the temperature control knob when turned end to end I don't think it does not click any where. According to schematics it has 3 terminals for heat or cool. I'd start looking there first. Any thing electrical I can tackle being an EE, if it leads to compressor or refrigerant I am no good with them at all. Thanks much for responding. I wonder where I can see IPB (illistrated parts breakdown) of this unit?
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Tony Hwang wrote:

I think I located a parts breakdown searching on "user manual" or "tech manual" along with the name of the product. Try both. IIRC, I was only able to view one page at a time, but I found it in minutes. Good luck! Maybe, hopefully, there is a fuse somewhere?
Bill
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Bill wrote:

Hi, Bill Thanks, indeed the capillary thermostat STDP switch is bad. Heating side contacs must be burnt out, there is no continuity but cooling side still works OK. p/n of the unit is HH22UC075. Now I have to find a replacement B4 it gets cold up here. One disadvantage living in Canada when one needs some thing like this. I am looking for an outfit who will ship one to Canada. If I jumper across burnt out terminals heating element(6 KW rated) comes on OK. Thanks again, Tony in Calgary
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Tony Hwang wrote:

Hi, Found one at Shorty's HVAC parts in Indiana. Price was reasonable at 66.00 a piece. Now the unit will be running soon for cold weather. Tony
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Tony Hwang wrote:

Congratulations on identifying the problem!
Cheers, Bill

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Bill wrote:

Hi, Follow up on it. Replaced the thermostat, all is well, back to normal. Now cold days can come....
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Tony Hwang wrote:

Hi, Also I installed snubber across heat contats, hope it helps.
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