Fujitsu · Air to Water Heat Pumps
The hydraulic unit's green LED flashes six times and the red LED flashes twice. This indicates a fault with the main Printed Circuit Board (PCB) in the outdoor unit.
Click steps to track your progress.
Power cycle the entire heat pump system by turning off the main breaker for 60 seconds, then switching it back on.
Check for any obvious loose connections or signs of burning around the outdoor unit's main PCB (only if you are a qualified technician).
Ensure the power supply to the outdoor unit is stable and free from voltage fluctuations.
If the error persists, it is highly likely that the main PCB needs to be replaced by a qualified service technician.
Avoid attempting to repair the PCB yourself, as this can cause further damage or personal injury.