Panasonic Aquarea H43 fault code
Panasonic Aquarea heat pumps
What it means
Abnormal water temperature sensor, Zone 1
With the optional PCB (CZ-NS4P) fitted the system needs a zone water sensor and cannot see it. H44 is the Zone 2 twin.
UK models this code applies to
From the Panasonic service literature we hold (Panasonic Aquarea installation guide 1.2 (Monobloc H & J generation, ProClub UK) — Error Codes during commissioning) — not a scraped list.
Aquarea Monobloc J 5 kW (WH-MDC05J3E5)Aquarea Monobloc J 7 kW (WH-MDC07J3E5)Aquarea Monobloc J 9 kW (WH-MDC09J3E5)Aquarea bi-bloc split WH-UD03EE5Aquarea bi-bloc split WH-UD05EE5Aquarea Monobloc WH-MDC12H6E5Aquarea Monobloc WH-MDC12J6E5Aquarea Monobloc WH-MDC16H6E5Aquarea Monobloc WH-MDC16J6E5Aquarea Monobloc WH-MXC09H3E5Aquarea Monobloc WH-MXC09J3E5Aquarea Monobloc WH-MXC12H6E5Aquarea Monobloc WH-MXC12J6E5Aquarea Monobloc WH-MXC12H9E8Aquarea Monobloc WH-MXC12J9E8Aquarea Monobloc WH-MXC16H9E8Aquarea Monobloc WH-MXC16J9E8
Now the harder half: proving what caused it
H43 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.
Chase H43 on your machine →Free, no sign-up. Pick the model and follow Panasonic Aquarea's own chart for it, one question at a time.
Or watch one get chased — free demo →