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.
Models that show this code
14 models in Mr. Slim PEAD-RP JA(L) ducted indoor unit
Other codes on the same units
- P1 Room (intake) air sensor TH1 open or shorted
- P2 Liquid pipe sensor TH2 open or shorted
- P4 Drain float switch disconnected
- P5 Drain overflow - float switch wet with pump running
- P6 Coil freeze or overheat protection
- P8 Pipe temperature out of range (coil not cooling or heating)
- P9 Coil sensor TH5 open or shorted
- PA Water leak detected
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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.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.