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Unit has been working properly for 4 years.
Suddenly – ‘No AC’
I’ve tested everything, but it still shows ‘No AC’
– checked the circuit breaker
– checked the GFI outlet
– Opened the unit and checked the incoming ac
– Opened the unit and checked the convert 26v output to board
All power tests show no issues
– Tried ‘reset’ button – does nothing
– changed battery
When I disconnect the display panel ribbon cable, the display is exactly the same – all blank except for ‘No AC’
Can anyone offer some help?