HVACopediaMitsubishi · Heat pump
E3 Remote controller cannot transmit
What the control is telling you
The remote could not find a free moment on the line for 6 seconds, or saw its own data come back different 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
- Two remotes both set to Main
- Remote wired to more than one indoor unit
- Duplicate refrigerant address
- Faulty remote controller or indoor board
- Electrical noise on the remote wire
Test and repair steps
- Set one remote to Main and the other to Sub.
- Connect the remote to only one indoor unit per refrigerant system.
- Give each system its own refrigerant address.
- Run the remote self-diagnosis RC OK = cycle power, replace the indoor board if it returns; RC NG = replace the remote; RC E3 or ERC = noise, reroute the remote wire.
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Source: Mitsubishi Electric PEAD-RP35-140JA(L) Service Manual, 10-3 Self-diagnosis action table, p.33. 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.