Mitsubishi Electric P9

Medium

PLY-ZM/PLY-M/PEY-M/PCY-M ve PUY-P/PUY-M serisi — Pipe (TH5) sensor error — condenser/evaporator pipe temperature thermistor abnormality

Mitsubishi Electric P9: Pipe (TH5) sensor error — condenser/evaporator pipe temperature thermistor abnormality This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Connector (CN20/CN21/CN29/CN44) on indoor controller board not properly connected
Thermistor faulty or wire broken

Check steps

Check connectors on the indoor controller board for secure connection
Measure the resistance value of the indoor thermistor

Affected parts

TH5 pipe thermistor
Indoor controller board connector

Safety note

Disconnect power supply before working on sensors.

Source: Mitsubishi Electric resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Mitsubishi Electric Mr. SLIM Indoor Unit — Malfunction-diagnosis method at maintenance service, PLY-ZM50EA / PLY-M60,80,100,125EA / PEY-M50,60,80,100,125JAL / PCY-M125KAL, rev. 20241024, page 3, Output pattern A table: "P9 | Pipe (TH5) sensor error". Cross-verified with Mr. SLIM Outdoor Unit manual, PUY-P42,48,125VKA…

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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Related fault codes

Refrigerant circuit abnormal (check code not oPL Indoor/outdoor communication error.E6 High discharge temperature — compressor overheU2 Outdoor thermistor fault (open/short).U4 Pipe temperature error (often defrost/thermistP8 Serial / panel communication error.0403