Mitsubishi Error Code E4: Indoor unit not receiving from remote controller (Heat Pump)
Mitsubishi error code E4 on a heat pump means: Indoor unit not receiving from remote controller. It is also called Mitsubishi diagnostic code E4.
Homeowner? What Mitsubishi code E4 means for you
Check, then call Your heat pump is reporting: Indoor unit not receiving from remote controller. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
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) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Mitsubishi error code E4 mean?
The indoor board has received nothing valid from the remote (or another indoor board) for 2-3 minutes. If both remotes are set to Sub, the remote shows E0 and the outdoor board LEDs show E4.
Applies to: PEAD-RP35/50/60/71/100/125/140JA and JA(L) ducted indoor units (220-240 V models)
Common causes of Mitsubishi code E4
- Remote controller wire loose or broken
- Both remote controllers set to Sub (none set to Main)
- Remote controller wired wrong, or wired to more than one indoor unit
A technician checks these and 4 other possible causes on site before replacing any part.
Mitsubishi models that use code E4
PEAD-RP35JAPEAD-RP35JALPEAD-RP50JAPEAD-RP50JALPEAD-RP60JAPEAD-RP60JALPEAD-RP71JAPEAD-RP71JALPEAD-RP100JAPEAD-RP100JALPEAD-RP125JAPEAD-RP125JALPEAD-RP140JAPEAD-RP140JAL
Other Mitsubishi Heat Pump codes
All Mitsubishi Heat Pump error codes →
Mitsubishi code E4: homeowner questions
What does Mitsubishi code E4 mean?
Indoor unit not receiving from remote controller. The indoor board has received nothing valid from the remote (or another indoor board) for 2-3 minutes. If both remotes are set to Sub, the remote shows E0 and the outdoor board LEDs show E4.
Is it safe to keep using my heat pump with code E4?
It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Can I reset Mitsubishi code E4 myself?
You can try one reset (power off for 30 seconds, then on). If Mitsubishi code E4 comes back, the cause is still there and a licensed technician should check it.
Who can fix Mitsubishi code E4 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
Source: Mitsubishi Electric PEAD-RP35-140JA(L) Service Manual, 10-3 Self-diagnosis action table, p.33. 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.