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Discussion Starter · #1 ·
I am seeing an error code that is otherwise unlisted on the wireless MRCH1 thermostat, which connects to a ducted Mitsubishi electric unit in the attic.
The display just reads "E 27"
The second zone for the first floor is run by a Mitsubishi Mr Slim unit, which is working fine.
None of the documentation we can find- online or otherwise- lists error 27, so we're scratching our heads on this.
The client says it was working last weekend, and of course, here comes a heat wave.
I've done a visual inspection of the unit and nothing stands out- power cycling the system & thermostat doesn't help, as the error code returns as soon as a button is pressed.
Any thoughts?
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