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Mod# A-SMH18SA SER# 2791206189 Heat controller mini-split. Cust says lights flashing on board- he resets it, yet it resumes to just flashing at the board. Nothing runs. Long drive out there- any ideas. Was operating fine a month ago and was tested out. walt

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First of all, Heat Controller does not mount any schematics on their systems panels at all and supply no information for the service tech to code the light on the outdoor board. This is unbelievable.
Anyway- I found that the electrician had re-arranged breakers in the panel supplying the building and had connected the outdoor heat pump to 120v instead of 240v. He had interpenetrated the connection at the unit that has marked 2(N) as being a neutral connection. I explained that on 120v systems, that is neutral, but on a 240v system, it's L2. The outdoor board was flashing 5 times after the power was turned on for 3 minutes. Voltage at "S" was 38.4v, with this condition and the indoor units lights (all) were flashing every second and beeping as well.
It's running fine now that we are connected to the proper voltage.

Posted on Jan 06, 2009

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