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This protector heater, also known as a high limit thermostat, is a genuine OEM part. Its function is to keep the heating coils from getting too hot by providing and automatic shutoff, which is an impo...
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Jim
March 10, 2023
hello, i need help troubleshooting this model. my question is how can i tell if a board is bad and what are the troubleshooting procedures? I have 24v at the main board thermostat terminals for W-C, Y-C, reversing valve-C, R-C, etc...Nothing is energizing except for the indoor fan. Please advise as how to proceed otherwise ill try replacing the boards.
For model number AZ85H12DACW1
Hi Jim, thank you for contacting us. Based on our research first, make sure the main control board gets its power from the transformer. If the transformer is working properly, maybe different electrical components on the main control board are defective. Check the control board for continuity. If it has no continuity then, you may need to replace the entire main control board, part number PS3487660. We hope this solves your problem!