Carrier · Pro-Dialog Control
There has been a sudden drop in the power supply to both the compressor board and contactor (e.g., for B1). This can cause damage. The compressor is shut down.
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Check the main power supply for fluctuations.
Inspect power wiring to the compressor board and contactor.
If voltage instability is detected, contact a qualified electrician.
Reset the system after power is stabilized.