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

Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler P9 Error Fix: Pipe Temperature Sensor (TC3) Error

The third pipe temperature thermistor (TC3) has failed. Used on systems with simultaneous heating and cooling capability, or multi-pipe configurations. Not present on standard residential single-zone systems. Check the sensor connector and wiring. Replace if defective.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error P9 on the Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler means: Pipe Temperature Sensor (TC3) Error. The top-ranked community fix is “Test and Replace Pipe Temperature Sensor (TC3)” (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 P9

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-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split 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

Other Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler 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 SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler Error P9

What does error code P9 mean on a Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler?

Error code P9 on the Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler means: Pipe Temperature Sensor (TC3) Error. The third pipe temperature thermistor (TC3) has failed. Used on systems with simultaneous heating and cooling capability, or multi-pipe configurations. Not present on standard residential single-zone systems. Check the sensor connector and wiring. Replace if defective.

How do I fix error code P9 on my Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler?

The most successful fix is "Test and Replace Pipe Temperature Sensor (TC3)" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code P9 on a Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler 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 SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler error P9 myself?

Yes — the top-ranked community fix ("Test and Replace Pipe Temperature Sensor (TC3)") 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 SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler error P9?

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

The Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler 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 P9 error?

Error code P9 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-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split 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 SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler have?

The Mitsubishi SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler 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 P9 error?

Error code P9 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-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split 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

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