Mitsubishi Error Code P2: Liquid pipe sensor TH2 open or shorted (Heat Pump)
Mitsubishi error code P2 on a heat pump means: Liquid pipe sensor TH2 open or shorted. It is also called Mitsubishi diagnostic code P2.
Homeowner? What Mitsubishi code P2 means for you
Check, then call Your heat pump is reporting: Liquid pipe sensor TH2 open or shorted. 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 P2 mean?
The liquid-line thermistor TH2 reads 90°C or more, or -40°C or less, and does not recover after the 3-minute pause. Checked in cool, dry and heat (not during defrost).
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 P2
- TH2 thermistor out of range
- Loose connector CN44 on the indoor control board
- Broken wire in the thermistor lead
A technician checks these and 2 other possible causes on site before replacing any part.
Mitsubishi models that use code P2
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 P2: homeowner questions
What does Mitsubishi code P2 mean?
Liquid pipe sensor TH2 open or shorted. The liquid-line thermistor TH2 reads 90°C or more, or -40°C or less, and does not recover after the 3-minute pause. Checked in cool, dry and heat (not during defrost).
Is it safe to keep using my heat pump with code P2?
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 P2 myself?
You can try one reset (power off for 30 seconds, then on). If Mitsubishi code P2 comes back, the cause is still there and a licensed technician should check it.
Who can fix Mitsubishi code P2 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.31. 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.