170
Troubleshooting
Error
code
Malfunctioning
or protection
Cause of the problem and corrective action
P0 Low pressure protection.
• There is no refrigerant in the system. Charge with refrigerant to
the required volume.
• In heating or hot water mode, the external heat exchanger is
dirty or clogged. Clean the heat exchanger.
• The water flow is low in cooling mode.
• The electrical expansion valve is blocked or the winding
connector is loose. Tap the valve body and insert/remove the
connector several times to check that the valve is working
properly. Install the winding in the correct position.
P1 High pressure protection.
Heating mode, domestic hot water mode:
• The water flow-rate is low; the water temperature is high, check
if there is air in the system. Expel the air.
• The water pressure is less than 0.1 Mpa, fill with water to increase
the pressure to 0.15-0.18 Mpa.
• Increase the volume of refrigerant. Top up the refrigerant to the
required volume.
• The electrical expansion valve is blocked or the winding
connector is loose. Tap the valve body and insert/remove the
connector several times to check that the valve is working
properly. Install the winding in the correct position.
Domestic hot water mode:
• The heat exchanger storage tank has an insucient area.
Increase parameter DT1s5 to 20 °C (DT DHW). Caution: this will
lower the maximum setpoint that the unit can fulfil.
Cooling mode:
• The external heat exchanger cover is attached. Remove it.
• The external heat exchanger is dirty or its surface is obstructed.
Clean the heat exchanger or remove the obstruction.
• Ensure that functional spaces and proper ventilation are
respected. Check for ventilation faults during operation.
P3
Compressor overcurrent
protection.
See P1.
The unit's power supply voltage is low, increase it to the required
value.
P4
Protection for high
discharge temperature.
• See P1.
• The volume of refrigerant in the system is insucient, charge
with the required volume.
• The TW_out temperature sensor is loose. Reconnect it.
• The T1 temperature sensor is loose. Reconnect it.
• The T5 temperature sensor is loose. Reconnect it.
P5
Protection against high
temperature dierence
between entering and
leaving water of the plate
heat exchanger.
• Check that all shut-o valves in the water circuit are fully open.
• Check that the water filter is clean.
• See paragraph “6.7 Filling / topping up with water” on page
47.
• Check that there is no air in the system (vent the system if
necessary).
• Check that the water pressure is sucient on the pressure
gauge. The water pressure must be >1 bar (cold water).
• Check that the pump speed is set to the maximum value.
• Check that the expansion tank is intact.
• Check that the characteristic of the water circuit is not too high
for the pump. See “START-UP AND CONFIGURATION - Pump
speed control”).
To Next Page
Loading...
Need help?
General