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Phil
Phil, Mechanical Engineer
Category: HVAC
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Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Rheem Heat Pump Model: RPKA-036JAS with Defrost

Customer Question

I have a Rheem Heat Pump Model: RPKA-036JAS with Defrost Control Board:621-83-550N
My unit was freezing over and not going into defrost mode. So I replaced the board. Same thing it's still freezing over and not going into defrost mode.
I don't know how to test the board for it doesn't have the typical witring identification of R C Y O W. Mine has SEN HLD 24VAC 24VAC Out Com.
Submitted: 10 months ago.
Category: HVAC
Expert:  airheatman replied 10 months ago.

I am leaving soon but can upload you a manual.

Expert:  airheatman replied 10 months ago.

http://www.mediafire.com/view/2a9447l9gsaar97/Rheem_RPKA.pdf

Troubleshooting the defrost controls start on page 11. Hopefully this will help.