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Please give me a few moments to look into your issue
No error codes? Just flashing indicator light?
It looks like there was a communication error. Lets turn it off and kill the power to the unit. Wait 10 seconds and return power and turn it on
What is the model#?
Were the fusses blown?
While I continue research can you check old fuses? Wanting to know if we had a surge
Is it flashing once a second?
Lower the thermostat as far as it will go
Wait a few minutes then check the outdoor unit. See if its on or has an error code
The Operation light will flash every second until "cool" is on. It seems like it isn't getting the proper signal from the stat
This is from the owner's manual
Sorry, It should flash UNTIL the air conditioner is ON, then the light stays on solid. So if you turned the temp down then the unit is not getting the signal. You may have a bad PCB
PCB Printed Circuit Board
I'm not sure that board is still available. You'd have to call a supplier on Monday. Yes the should be able to test it. I hope I'm wrong. Not being there makes it hard for me to truly diagnose
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Do you have any other questions?