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Old 09-14-2018, 10:26 PM   #7
Helipilot
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Join Date: May 2015
Posts: 24
Update: The A/C system communicated via a reverse polarity telephone type wire. It runs from the thermostat to one of the a/c units on the roof and those two units are connected by the same type of wire to each other. If a fault occurs in any of those two wires the E1 code occurs and both units shut down.


Once I understood how the system worked I was able to "pop" off the cover on the thermostat and run continuity tests throughout the system. The wires were all OK. The issue was the "mother" board on the rear heat pump/air conditioner. I have one inbound and that should solve the problem.


I guess my 50+ years of commercial flying and rebuilding aircraft paid off as I had the test equipment to track down the problem.
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