Error code
A1-00 Indoor unit PCB abnormality
Applies to 25 models
CTXM15R2V1B, CTXM15R5V1B, FTXM20R2V1B, FTXM20R5V1B, FTXM25R2V1B, FTXM25R5V1B, FTXM35R2V1B, FTXM35R5V1B, FTXM42R2V1B, FTXM42R5V1B, FTXM50R2V1B, FTXM60R2V1B, FTXM71R2V1B, ATXM20R2V1B, ATXM20R5V1B, ATXM25R2V1B, ATXM25R5V1B, ATXM35R2V1B, ATXM35R5V1B, ATXM50R2V1B, RXM20~71R(9), ARXM25~71R(9), FTXM20~71R, ATXM25~50R, FVXM25~50A
What this means
The indoor unit cannot set internal settings and stops operating.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.
See the official Daikin manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.