Question 1

What does error code H62 (Panasonic Aquarea) u Panasonic Aquarea & NIBE mean and how to fix it?

Accepted Answer

Abnormally low heating water flow rate (Flow Switch / flow sensor below minimum). Troubleshooting & fix: Clean the magnetic dirt separator and the stainless steel water strainer mesh (Y-filter) inside the hydrobox, bleed air from the system, and ensure underfloor heating loops are open.

Question 2

What does error code H11 (Panasonic Aquarea) u Panasonic Aquarea & NIBE mean and how to fix it?

Accepted Answer

Communication error between indoor unit (hydrobox) and outdoor unit. Troubleshooting & fix: Turn off the main heat pump circuit breaker for 3 minutes to perform a hard reset; if the error persists, inspect the interconnecting cable terminals (1-2-3) and the outdoor PCB fuse.

Question 3

What does error code F20 / H70 (Panasonic Aquarea) u Panasonic Aquarea & NIBE mean and how to fix it?

Accepted Answer

Compressor overload (high discharge temperature) or tripped backup heater thermal cut-out (H70). Troubleshooting & fix: For code H70, press the manual reset thermal cut-out button on the backup heater inside the hydrobox; for code F20, check the refrigerant charge and electronic expansion valve.

Question 4

What does error code A11 / EB101 (NIBE) u Panasonic Aquarea & NIBE mean and how to fix it?

Accepted Answer

Loss of communication between SMO / VVM indoor controller and NIBE outdoor unit. Troubleshooting & fix: Tripped outdoor unit breaker, interference on the shielded LiYY/LiYCY communication cable, or frozen outdoor PCB – perform a full power-cycle restart of both units.

Question 5

What does error code A21 / LP Alarm (NIBE) u Panasonic Aquarea & NIBE mean and how to fix it?

Accepted Answer

Refrigerant circuit Low Pressure (LP) alarm in the outdoor unit. Troubleshooting & fix: Heavy ice buildup on the outdoor evaporator coil restricting airflow, blocked fan blades, ice-clogged condensate drain pan, or refrigerant leak.

Panasonic Aquarea & NIBE Fault Codes: H62, H11, F20 / H70, A11 / EB101, A21 – Error Code Meaning, Troubleshooting & Repair

Error Code Reference Table for Panasonic Aquarea & NIBE and step-by-step repair procedure:

Error Code	Meaning / Fault Symptom	Most Common Cause & Repair Procedure
H62 (Panasonic Aquarea)	Abnormally low heating water flow rate (Flow Switch / flow sensor below minimum)	Clean the magnetic dirt separator and the stainless steel water strainer mesh (Y-filter) inside the hydrobox, bleed air from the system, and ensure underfloor heating loops are open.
H11 (Panasonic Aquarea)	Communication error between indoor unit (hydrobox) and outdoor unit	Turn off the main heat pump circuit breaker for 3 minutes to perform a hard reset; if the error persists, inspect the interconnecting cable terminals (1-2-3) and the outdoor PCB fuse.
F20 / H70 (Panasonic Aquarea)	Compressor overload (high discharge temperature) or tripped backup heater thermal cut-out (H70)	For code H70, press the manual reset thermal cut-out button on the backup heater inside the hydrobox; for code F20, check the refrigerant charge and electronic expansion valve.
A11 / EB101 (NIBE)	Loss of communication between SMO / VVM indoor controller and NIBE outdoor unit	Tripped outdoor unit breaker, interference on the shielded LiYY/LiYCY communication cable, or frozen outdoor PCB – perform a full power-cycle restart of both units.
A21 / LP Alarm (NIBE)	Refrigerant circuit Low Pressure (LP) alarm in the outdoor unit	Heavy ice buildup on the outdoor evaporator coil restricting airflow, blocked fan blades, ice-clogged condensate drain pan, or refrigerant leak.