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Mitsubishi · MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit

Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit P8 Error Fix: Sub-Cool Pipe Temperature Sensor Error

The secondary pipe temperature thermistor (TC2) has failed. This sensor is used on certain multi-pipe systems and monitors the sub-cooling temperature in the refrigerant circuit. Not present on all models. Check the sensor connector and wiring. Measure thermistor resistance. Replace if defective.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error P8 on the Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit means: Sub-Cool Pipe Temperature Sensor Error. The top-ranked community fix is “Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)” (medium difficulty, ~45 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · mini split

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many mini split repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$200.

Other Mitsubishi Models with Error P8

MLZ-KP09NA 9,000 BTU One-Way Ceiling Cassette Indoor Unit

mini_split · 2 fixes

MSZ-EF15NA 15,000 BTU Designer Series (Kirigamine Zen) Wall-Mount Indoor Unit

mini_split · 2 fixes

MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit

mini_split · 2 fixes

MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit

mini_split · 2 fixes

MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit

mini_split · 2 fixes

SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit

mini_split · 2 fixes

SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit

mini_split · 2 fixes

SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler

mini_split · 2 fixes

Other Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit Error Codes

Remote Controller PCB Error

2 fixes

Remote Controller Signal Receiving Error

2 fixes

Remote Controller Communication Error

2 fixes

Indoor Unit PCB Processor Error

2 fixes

Indoor/Outdoor Communication Error (Legacy)

2 fixes

Indoor Unit EEPROM Error

2 fixes

Indoor Fan Motor Error

2 fixes

Indoor Unit Overcurrent Protection

2 fixes

People Also Ask About Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit Error P8

What does error code P8 mean on a Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit?

Error code P8 on the Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit means: Sub-Cool Pipe Temperature Sensor Error. The secondary pipe temperature thermistor (TC2) has failed. This sensor is used on certain multi-pipe systems and monitors the sub-cooling temperature in the refrigerant circuit. Not present on all models. Check the sensor connector and wiring. Measure thermistor resistance. Replace if defective.

How do I fix error code P8 on my Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit?

The most successful fix is "Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code P8 on a Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit error P8 myself?

Yes — the top-ranked community fix ("Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

How much does it cost to repair Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit error P8?

DIY cost: $10-$20. Professional repair typically costs $150-$200. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit have?

The Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit has 8 other known error codes, including: E1 (Remote Controller PCB Error), E2 (Remote Controller Signal Receiving Error), E3 (Remote Controller Communication Error), E4 (Indoor Unit PCB Processor Error), E5 (Indoor/Outdoor Communication Error (Legacy)), and 3 more.

Which other Mitsubishi models have the P8 error?

Error code P8 also appears on 8 other Mitsubishi models: MLZ-KP09NA 9,000 BTU One-Way Ceiling Cassette Indoor Unit, MSZ-EF15NA 15,000 BTU Designer Series (Kirigamine Zen) Wall-Mount Indoor Unit, MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit, MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit, MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit have?

The Mitsubishi MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit has 8 other known error codes:

E1 — Remote Controller PCB Error (2 fixes)
E2 — Remote Controller Signal Receiving Error (2 fixes)
E3 — Remote Controller Communication Error (2 fixes)
E4 — Indoor Unit PCB Processor Error (2 fixes)
E5 — Indoor/Outdoor Communication Error (Legacy) (2 fixes)
E6 — Indoor Unit EEPROM Error (2 fixes)
E7 — Indoor Fan Motor Error (2 fixes)
E8 — Indoor Unit Overcurrent Protection (2 fixes)

Which other Mitsubishi models have the P8 error?

Error code P8 also appears on 8 other Mitsubishi models:

MLZ-KP09NA 9,000 BTU One-Way Ceiling Cassette Indoor Unit (mini split) · 2 fixes
MSZ-EF15NA 15,000 BTU Designer Series (Kirigamine Zen) Wall-Mount Indoor Unit (mini split) · 2 fixes
MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit (mini split) · 2 fixes
MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit (mini split) · 2 fixes
MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit (mini split) · 2 fixes
SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit (mini split) · 2 fixes
SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit (mini split) · 2 fixes
SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler (mini split) · 2 fixes

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