Error H65 trips when the internal flow sensor detects insufficient or zero water circulation during an active defrost cycle. The system enforces a safety lockout to prevent the plate heat exchanger (brazed PHE) from freezing and rupturing.

⏱ 30-45 Mins Troubleshoot →

CODE H91 Aquarea L Series Indoor Hydrokit High

Tank Booster Heater Thermal Cut-Out

Error code H91 indicates an open circuit on the domestic hot water (DHW) tank booster heater thermal cut-out safety circuit. The mechanical high-limit thermostat (typically tripping at ~85°C) has opened due to localized overheating, poor water circulation, scale accumulation, or dry firing.

⏱ 30-45 Mins Troubleshoot →

CODE H62 Aquarea Generation L Series Critical

Water Flow Switch Contact Defect

Error H62 trips when the indoor PCB detects that the water flow switch contact remains open for over 10 seconds during water pump operation, or detects an abnormal contact state (short/open mismatch against pump status), halting heating/cooling to prevent heat exchanger freeze-up or dry firing.

⏱ 30-45 Mins Troubleshoot →

CODE H62 Aquarea Generation L Series High

Primary Circuit Flow Failure

Error H62 indicates an abnormal hydronic flow condition detected by the vortex flow sensor or flow switch, where water flow drops below the operational threshold (< 7-9 L/min depending on unit capacity) during compressor operation, triggering protective shutdown to prevent heat exchanger freezing or thermal runaway.

⏱ 30-45 Mins Troubleshoot →

CODE H76 Aquarea L Series R290 High

Remote Controller Communication Fault

Error code H76 designates a bidirectional serial communication failure between the indoor control board and the remote controller (RC/display interface). When communication is lost for more than 60 consecutive seconds, the outdoor unit is forced into an operational lockout to prevent unmonitored compressor cycling.

⏱ 30-45 Mins Troubleshoot →

CODE H62 Aquarea L Series R290 Air-to-Water Heat Pump High

Water Flow Switch Bypass Alarm

Error H62 trips when the outdoor/indoor main PCB detects a continuous closed contact signal from the primary water flow switch prior to the circulation water pump starting, indicating a stuck closed microswitch, mechanical paddle seizure, or shorted sensor circuit bypass.

⏱ 30-45 Mins Troubleshoot →