HVACopediaMitsubishi · Heat pump
E7 Indoor unit transmit error to outdoor unit
What the control is telling you
The indoor board sent a 0 but read back a 1, 30 times in a row.
Applies to: PEAD-RP35/50/60/71/100/125/140JA and JA(L) ducted indoor units (220-240 V models)
Likely causes
- Faulty send/receive circuit on the indoor board
- Electrical noise on the power supply
- Electrical noise on the outdoor control wire
Test and repair steps
- Cycle the power and see if the code returns.
- Look for noise sources near the wiring (inverters, large motors, power cables run alongside S1-S2-S3).
- If it comes back, replace the indoor control board.
Models that show this code
14 models in Mr. Slim PEAD-RP JA(L) ducted indoor unit
Other codes on the same units
- E3 Remote controller cannot transmit
- E4 Indoor unit not receiving from remote controller
- E5 Indoor unit cannot transmit to remote controller
- E6 Indoor/outdoor communication - indoor not receiving
- 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
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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.
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