HVACopediaMitsubishi · Heat pump
Fb Indoor control board memory error
What the control is telling you
The indoor board cannot read its non-volatile memory.
Applies to: PEAD-RP35/50/60/71/100/125/140JA and JA(L) ducted indoor units (220-240 V models)
Likely causes
- Faulty indoor control board
Test and repair steps
- Turn the unit off at the remote first, then switch off the breaker before opening the unit or unplugging connectors.
- Replace the indoor control board and set its model/capacity switches (SW1, SW2) to match the old board.
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Source: Mitsubishi Electric PEAD-RP35-140JA(L) Service Manual, 10-3 Self-diagnosis action table, p.34. Summarized in our own words; check the original manual for your model.
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