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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a unionair Model# HWC 012A4H0 Serial # 222833 I have

Customer Question

I have a unionair Model# ***** 012A4H0
Serial # *****
I have an E 7 error flashing and my manuel only goes to E5
the only thing that works is the wall mounted unit fan. No heat or air
Please tell me what to do.
Thank you very much
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.

Hello, these are electronically complex systems. I can take a look at it for you, but in the end you will most likely have to call a local shop that specializes in these type systems to do the repair.

I need to know how old the system is approximately,

Please attach a well focused, close up photo of the wiring diagram glued inside the service panel at the outside unit, you can use the paper clip icon at the right end of the toolbar at the top of this dialog box,

If there is no paper clip icon, look for the '+attach files' link at left of your send button.

I can mark it up with trouble shooting instructions. You will need a multi meter ($30 at a hardware store) and some experience working with appliances, let me know a lot about your skill sets in those regards.