Mitsubishi Error Code PA: Water leak detected (Heat Pump)
Mitsubishi error code PA on a heat pump means: Water leak detected. It is also called Mitsubishi diagnostic code PA.
Homeowner? What Mitsubishi code PA means for you
Call a technician Your heat pump is reporting: Water leak detected. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
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 PA mean?
Checked whenever the unit is not cooling or drying. Set when the liquid pipe stays more than 10°C below the intake air for 30 minutes and the float switch has been wet for 15 minutes. Does not clear until the main power is reset. Some controllers show this as 2500.
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 PA
- On multi-unit systems: line sets crossed between units
- On multi-unit systems: indoor/outdoor wires crossed
- Intake or liquid pipe sensor reading wrong
A technician checks these and 3 other possible causes on site before replacing any part.
Mitsubishi models that use code PA
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 PA: homeowner questions
What does Mitsubishi code PA mean?
Water leak detected. Checked whenever the unit is not cooling or drying. Set when the liquid pipe stays more than 10°C below the intake air for 30 minutes and the float switch has been wet for 15 minutes. Does not clear until the main power is reset. Some…
Is it safe to keep using my heat pump with code PA?
It depends on the cause. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Mitsubishi code PA myself?
You can try one reset (power off for 30 seconds, then on). If Mitsubishi code PA comes back, the cause is still there and a licensed technician should check it.
Who can fix Mitsubishi code PA 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.34. 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.