Status
This is a critical alarm, the unit will not operate in any mode.
Description
This code is displayed anytime there is no communication as expected between the indoor unit and outdoor unt.
Expected Operation
No operation
Cause
Possible miswiring or damaged wire between indoor unit and outdoor unit control boards.
Solution
Verify wiring end to end at E1-E1, E2-E2, R-R, C-C. Check for damaged wire or poor connections in low voltage wiring at either end or somewhere between.