Mitsubishi Error Code Locked indicator: Remote buttons locked (Heat Pump)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Mitsubishi error code Locked indicator on a heat pump means: Remote buttons locked. It is also called Mitsubishi diagnostic code Locked indicator.

Low severityHeat PumpMr. Slim PEAD-RP JA(L) ducted indoor unit

Homeowner? What Mitsubishi code Locked indicator means for you

Usually minor Your heat pump is reporting: Remote buttons locked. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Mitsubishi error code Locked indicator mean?

The Locked indicator on the wired remote shows that the remote controller buttons have been locked, so presses are ignored. Not a fault.

Applies to: Mr. Slim PEAD-RP JA(L) ducted indoor units with PAR-21MAA wired remote

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Mitsubishi models that use code Locked indicator

PEAD-RP35JA PEAD-RP35JAL PEAD-RP50JA PEAD-RP50JAL PEAD-RP60JA PEAD-RP60JAL PEAD-RP71JA PEAD-RP71JAL PEAD-RP100JA PEAD-RP100JAL PEAD-RP125JA PEAD-RP125JAL PEAD-RP140JA PEAD-RP140JAL

Other Mitsubishi Heat Pump codes

Code	Meaning
E7	Indoor unit transmit error to outdoor unit
Fb	Indoor control board memory error
FILTER	Clean the filter indicator
LED1 (indoor board)	Indoor board LED1 - control power
LED2 (indoor board)	Indoor board LED2 - remote controller power
LED3 (indoor board)	Indoor board LED3 - indoor/outdoor communication
Louver display	Swing louver action indicator
NOT AVAILABLE	Remote message - function not available
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

All Mitsubishi Heat Pump error codes →

Mitsubishi code Locked indicator: homeowner questions

What does Mitsubishi code Locked indicator mean?

Remote buttons locked. The Locked indicator on the wired remote shows that the remote controller buttons have been locked, so presses are ignored. Not a fault.

Is it safe to keep using my heat pump with code Locked indicator?

Usually yes. Code Locked indicator is normally minor, but if it keeps coming back have it checked.

Can I reset Mitsubishi code Locked indicator myself?

You can try one reset (power off for 30 seconds, then on). If Mitsubishi code Locked indicator comes back, the cause is still there and a licensed technician should check it.

Who can fix Mitsubishi code Locked indicator near me?

Aurora Star Tech Inc. repairs Mitsubishi heat pumps in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air

Troubleshooting guides

Indoor board LED1 and LED2 both off - no power Mitsubishi · Heat Pump
Indoor board LED2 blinking - remote controller line problem Mitsubishi · Heat Pump
Indoor fan does not run Mitsubishi · Heat Pump
PLEASE WAIT stays on, or an error shows about 2 minutes after power-up Mitsubishi · Heat Pump
Read the error history with the wired remote self-check Mitsubishi · Heat Pump
Start a test run from the wireless remote Mitsubishi · Heat Pump

Source: Mitsubishi PEAD-RP35JA(L) Service Manual, Part Names and Functions, p.4. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.