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Mitsubishi · Heat pump troubleshooting

Indoor board LED2 blinking - remote controller line problem

What is going on

LED2 on the indoor control board blinks. If LED1 blinks too, the indoor/outdoor wire is the problem; if LED1 is steady, look at the remote controller line.

Likely causes

  • Indoor/outdoor connecting wire loose (LED1 also blinking)
  • On twin/triple systems, remote wired to more than one indoor unit
  • Refrigerant address wrong, or more than one unit at address 0 in a group
  • Remote controller wire shorted
  • Faulty remote controller

Check in this order

  1. If LED1 is also blinking, check the S1-S2-S3 connections.
  2. On twin/triple systems, connect the remote to only one of the indoor units.
  3. In group control, make sure only one system uses address 0 (SW1 3-6 on the outdoor board).
  4. Disconnect the remote wire if LED2 keeps blinking, the remote wire is shorted. If LED2 goes steady, reconnect - blinking again means a bad remote; steady means the connection was the problem.

Applies to: PEAD-RP35/50/60/71/100/125/140JA and JA(L) ducted indoor units (220-240 V models)

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Source: Mitsubishi Electric PEAD-RP35-140JA(L) Service Manual, 10-4 Troubleshooting by inferior phenomena, p.35. Written in our own words; check the manual for your exact model.

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.