Panasonic Heat Pumps

Panasonic Heat Pumps: manuals, user guides and error codes

Looking for a Panasonic heat pump manual, user guide, or error code explanation? ServiceMy has created a dedicated resource hub to help homeowners quickly find the information they need for their system.

Our guide library includes downloadable manuals, setup instructions, troubleshooting advice and clear explanations of common error codes. If your Panasonic heat pump is showing a fault code, not heating properly, or you simply want to understand how to operate it more efficiently, our guides are designed to help you identify the issue and keep your system running smoothly. These resources are regularly updated and written by experienced heat pump engineers to help you get the most from your heating system, improve efficiency and avoid unnecessary breakdowns.

These apply for the following air source heat pump models:

WH-MDC05J3E5
WH-MDC07J3E5
WH-MDC09J3E5
WH-MDC12J6E5
WH-MDC16J9E5
WH-MXC09J3E5
WH-MXC12J6E5

WH-MXC16J9E5
WH-MDC05H3E5
WH-MDC09H3E5
WH-MDC12H6E5
WH-MDC16H6E5
S2125-20
S2125-8

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Heat pump malfunctions: Panasonic Error Codes

If you cannot find the error code explanation or need help resolving any issues, ServiceMy can help diagnose and arrange a professional heat pump service to restore your system to optimum performance.

Error Code	Title	Explanation
H00	No Fault	System operating normally; no active error.
H11	Indoor-Outdoor Communication Fault	Communication error between indoor and outdoor units; check wiring and connections.
H12	Capacity Mismatch Fault	Indoor and outdoor unit mismatch or incorrect configuration.
H14	Indoor Air Temperature Sensor Fault	Fault with indoor air temperature sensor.
H15	Outdoor Compressor Temperature Sensor Fault	Compressor temperature sensor failure.
H16	Current Transformer Fault	Electrical current detection fault.
H19	Indoor Fan Motor Lock	Indoor fan motor not rotating or obstructed.
H23	Indoor Heat Exchanger Sensor Fault	Fault with indoor coil temperature sensor.
H24	Indoor Heat Exchanger Sensor Fault (Secondary)	Secondary indoor coil sensor failure.
H25	Air Ion / Air Quality Fault	Fault with air purification system (if fitted).
H26	External Device Fault	Fault triggered by external control or accessory.
H27	Outdoor Air Temperature Sensor Fault	External air sensor failure; affects system efficiency.
H28	Outdoor Heat Exchanger Sensor Fault	Outdoor coil sensor fault.
H29	Outdoor Pipe Temperature Sensor Fault	Fault with refrigerant pipe sensor.
H30	Discharge Temperature Sensor Fault	Compressor discharge sensor failure.
H31	Room Temperature Sensor Fault	Room sensor failure or incorrect reading.
H32	Outlet Water Temperature Sensor Fault	Water flow temperature sensor fault.
H33	Inlet Water Temperature Sensor Fault	Return water sensor fault.
H34	Outdoor Heat Sink Sensor Fault	Fault with inverter heat sink temperature sensor.
H35	Indoor / Outdoor Connection Fault	Incorrect wiring or system connection error.
H36	Water Flow Switch Fault	No water circulation detected; possible pump or airlock issue.
H37	Water Pump Fault	Circulation pump not operating correctly.
H38	Water Pressure Fault	System pressure too low or high; check filling loop or expansion vessel.
H39	Defrost Fault	Defrost cycle not operating correctly.
H41	Freeze Protection Activated	System protecting against freezing conditions.
H42	Water Temperature Too High	Flow temperature exceeded safe limits.
H43	Low Water Temperature Fault	Water temperature too low; may indicate system imbalance.
H50	Ventilation Fan Fault	Ventilation or auxiliary fan failure.
H51	Overload Protection Fault	System overloaded; compressor or electrical issue.
H52	Voltage Supply Fault	Supply voltage outside acceptable limits.
H59	Indoor Unit Communication Fault	Internal communication error within indoor unit.
F90	Compressor Overload Protection	Compressor operating outside safe limits.
F91	Refrigeration Cycle Fault	General refrigerant circuit issue.
F92	Compressor Discharge Temperature High	Compressor overheating; possible flow or refrigerant issue.
F93	Compressor Abnormal Rotation	Compressor not operating correctly.
F95	High Pressure Protection	Refrigerant pressure too high; poor heat transfer or flow issue.
F96	Power Transistor Module Overheat	Inverter module overheating.
F97	Compressor Overheat Protection	Compressor temperature exceeded safe limit.
F98	Total Current Protection	Excess electrical current detected.
F99	DC Peak Current Fault	Electrical surge or inverter issue.
U02	Power Supply Fault	Voltage too high or low; unstable power supply.
U03	Communication Fault (Wiring)	Communication wiring issue between components.
U04	Communication Fault (Indoor-Outdoor)	Loss of communication between units.
U07	Communication Fault (Controller)	Remote controller communication issue.
U10	Data Transmission Fault	Internal data communication error.
U12	Addressing Fault	Incorrect system addressing or configuration.
U14	Sensor Communication Fault	Sensor data transmission error.

Schedule Your Heat Pump Service Today

Don’t wait until efficiency drops, or your pump encounters issues. Investing in routine maintenance for your air source heat pump is the best way to keep your household energy-efficient, cosy, and cost-effective year-round.

Get in touch with our professional servicing team today to schedule your appointment. With extensive experience in heat pump servicing and home energy solutions, we’re here to help you stay warm, save money, and protect your investment.

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Maintain your heat pump, and it will reward you with years of efficient and reliable performance.