171
Troubleshooting
Error
code
Malfunctioning
or protection
Cause of the problem and corrective action
P6 Module protection.
• The unit's power supply voltage is low, increase it to the required
value.
• The space between the units is too narrow for heat exchange.
Increase the space between units.
• The heat exchanger is dirty or its surface is obstructed. Clean
the heat exchanger or remove the obstruction.
• The fan is not working. The fan motor is faulty, replace the fan
or the motor.
• Increase the volume of refrigerant. Top up the refrigerant to the
required volume.
• The water flow-rate is low, there is air in the system or the pump
head is not sucient. Expel the air and reset the pump.
• The leaving water temperature sensor is loose or faulty,
reconnect it or replace it.
• The domestic hot water storage tank has coils that are not
suitable for the power to be dissipated.
• The wires or screws on the module are loose. Reconnect the
wires and screws.
• The heat-conducting adhesive is dry or detached. Add heat-
conducting adhesive.
• The wire connector is loose or detached. Reconnect the wire
• The control board is defective, replace it.
• If the control system is working properly, it means that the
compressor is faulty
P9 Fan protection. Contact the Distributor
Pd
Protection for high
refrigerant outlet
temperature in the finned
coil in cooling mode.
• The heat exchanger cover is attached.
• The heat exchanger is dirty or its surface is obstructed.
• The space around the unit is not sucient for heat exchange.
• Review the installation.
• The fan motor is faulty.
Pb Antifreeze protection. The unit will automatically return to normal operation.
PP
The inlet water temperature
is higher than the outlet
water temperature in
heating mode.
• The inlet/outlet water sensor connector is loose.
• The inlet sensor (TW_in) or outlet sensor (TW_out) is faulty.
• The 4-way valve is blocked. Restart the unit to make the valve
change direction.
• The 4-way valve is faulty.
F1
DC generatrix voltage too
low.
• Check power supply.
• If the power supply is OK, check if the LED light is OK, check
the PN voltage, if it is 380 V, the problem is with the main board.
If the light is o, disconnect the power supply, check the IGBT,
check the diodes, if the voltage is not correct, the inverter board
is damaged, replace it.
• If the IGBT is OK, which means the inverter board is OK, the
rectifier bridge of the power module is not correct, check the
bridge. Same method as for the IGBT, disconnect the power
supply, check whether the diodes are damaged or not.
• Usually if F1 trips when the compressor starts, the reason is
possibly the motherboard. If F1 trips when the fan starts, it may
be due to the inverter board.
To Next Page
Loading...
Need help?
General