All Panasonic error codes
This page brings together Panasonic error codes sorted by type of fault: what each code means, its likely causes, and what you can safely check before calling a professional.
Can’t find your Panasonic code in the list?
Describe your issue to Cody. It identifies the code, tells you what’s happening, and what you can check yourself. If it doesn’t know the code, it looks it up in the manufacturer’s documentation.
Find your code quickly
The Panasonic codes on this page, grouped by type of fault.
communication
water flow
reversing valve
Temperature sensor — Panasonic
These codes indicate a sensor that’s no longer returning a consistent value. The fault almost always comes from the sensor itself or its connector, rarely from the unit.
Code F43Informationair-to-water
Outdoor defrost sensor fault
Models affected: Aquarea T-CAP H series
Code F49Informationair-to-water
Bypass outlet sensor fault
Models affected: Aquarea T-CAP H series
Code H14Medium severityair-to-air
Indoor temperature sensor fault
Possible causes
- Faulty room thermistor
- Loose connection
- Short circuit
What you can check
- Turn off power for 30 minutes, then restart
Models affected: CS-TZ, CS-MZ, CS-Z, CS-HZ
This fault requires a qualified technician. Do not open the unit.
Code H67Informationair-to-water
Outdoor thermistor 1 fault
Models affected: Aquarea T-CAP H series
Code H68Informationair-to-water
Outdoor thermistor 2 fault
Models affected: Aquarea T-CAP H series
General fault — Panasonic
These codes don’t point to a specific part: the unit is signaling that an internal safety feature has been triggered.
Code F23Critical severityair-to-water
DC peak current anomaly
Possible causes
- Short circuit on the compressor
- Faulty power module
- Damaged compressor cable
What you can check
- Turn off power — do not restart — call a technician
Models affected: Aquarea T-CAP, WH-UD, WH-UX
This fault requires a qualified technician. Do not open the unit.
Code F32Informationair-to-water
Internal thermostat fault
Models affected: Aquarea T-CAP H series
Code F99Critical severityair-to-water
Repeated DC peak current detection
Possible causes
- Compressor short circuit
- Faulty power module
- Damaged compressor wiring
What you can check
- Turn off power — do not restart — call a technician
Models affected: Aquarea T-CAP, WH-UD, WH-UX
This fault requires a qualified technician. Do not open the unit.
Code H75Informationair-to-water
Low water temperature protection
Models affected: Aquarea T-CAP H series
Compressor — Panasonic
The compressor is the unit’s most critical and most expensive part. These codes protect the system by shutting it down before damage occurs: never force repeated restarts.
Code F90Critical severityair-to-air
PFC (Power Factor Correction) circuit protection
Possible causes
- Faulty outdoor board
- Voltage at the PFC level
Models affected: CU-TZ, CU-MZ
This fault requires a qualified technician. Do not open the unit.
Code H16Critical severityair-to-air
Compressor current fault (CT)
Possible causes
- Faulty current sensor
- Compressor overload
- Faulty CT wiring
What you can check
- Turn off power for 30 minutes, then restart
Models affected: CU-TZ, CU-MZ
This fault requires a qualified technician. Do not open the unit.
Communication — Panasonic
The indoor unit and outdoor unit are no longer communicating. This is often the connecting cable or a circuit board, not the refrigerant circuit.
Code H74Informationair-to-water
Board communication fault
Affected models: Aquarea T-CAP H series
Water Flow — Panasonic
The water flow in the heating circuit is insufficient. The circulator pump, filter, valves, and air in the system are the usual suspects.
Code F29Informationair-to-water
Overheating from low flow
Affected models: Aquarea T-CAP H series
This issue requires a qualified technician. Do not open the unit.
Reversing Valve — Panasonic
Code F11Critical severityair-to-air
4-way reversing valve fault (cycle reversal)
Possible causes
- Stuck 4-way valve
- Faulty valve coil
- Incorrect circuit pressure
What you can check
- Turn off the power for 30 minutes, then restart
Affected models: CU-TZ, CU-MZ, CU-Z
This issue requires a qualified technician. Do not open the unit.
All Panasonic codes published on the site
This list updates automatically with every new guide.
Technical information provided for guidance only, based on manufacturer documentation and field feedback. It does not replace a diagnosis by a qualified professional. Found an error on this page? Report it.