HVACopedia

Mitsubishi · Heat pump troubleshooting

PLEASE WAIT stays on, or an error shows about 2 minutes after power-up

What is going on

For about 2 minutes after power-up the remote shows PLEASE WAIT while the system starts - that is normal. If it is followed by an error code, or the screen stays blank with the ON button doing nothing, there is a wiring or protection problem.

Likely causes

  • Outdoor unit protection device connector not plugged in
  • Reversed or missing phase on the outdoor power terminal block (3-phase units)
  • S1-S2-S3 polarity wrong between indoor and outdoor
  • Remote controller wire shorted

Check in this order

  1. Wait 2 minutes after power-up before testing (and about 30 seconds after leaving function settings).
  2. Check the outdoor board LEDs LED1 and LED2 blinking together after 2 minutes means a wiring or protection fault.
  3. Check the protection device connector on the outdoor board.
  4. Check the S1-S2-S3 wiring matches terminal for terminal.
  5. Check the remote controller wire for a short.

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

More heat pump guides

Related

Mitsubishi error codes · Mitsubishi tips · Calculators and reference tables

Take it to the job

All guides, error codes and tips work offline in the HVACopedia app.

Open the app

Source: Mitsubishi Electric PEAD-RP35-140JA(L) Service Manual, 10-2 Self-check function, p.27-29. 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.