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Mitsubishi · Heat pump

E7 Indoor unit transmit error to outdoor unit

High severity Mr. Slim PEAD-RP JA(L) ducted indoor 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

  1. Cycle the power and see if the code returns.
  2. Look for noise sources near the wiring (inverters, large motors, power cables run alongside S1-S2-S3).
  3. If it comes back, replace the indoor control 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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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.