Immergas MAGIS M4-30 Use And Installation page 127

Supervision
Error
System Error Operation or protection anomaly
Code
Code
P0 20 Low pressure protection switch.
P1 21 High pressure protection switch.
Protection against compressor overcur-
P3 23
rent.
Protection against flow temperature
P4 24
of the compressor too high
High temperature difference be-
tween water inlet and water outlet
P5 25
of the plate heat exchanger. (Tw_out-
Tw_in)
Cause of fault and corrective action
1. The system is without refrigerant volume. Charge the refrigerant
at the right volume.
2. In heating mode or in DHW mode, the external heat exchanger is
dirty or something is blocked on the surface. Clean the external heat
exchanger or remove the obstruction.
3. The water flow is too low in cooling mode. Increase the water flow.
4. The electric expansion valve is blocked or the winding connector
is loose. Touch the body of the valve and connect/disconnect the
connector several times to make sure that the valve works properly.
Heating mode, DHW mode:
1. The water flow is low; the temperature of the water is high, if there
is air in the water system. Release the air.
2. The water pressure is lower than 0.1 MPa, load the water to leave
the pressure in the range 0.15-0.2 MPa.
3. Refrigerant volume overload. Recharge the refrigerant at the right
volume.
4. The electric expansion valve is blocked or the winding connector
is loose. Touch the body of the valve and connect/disconnect the
connector several times to make sure that the valve works properly.
Also install the winding in the right position. DHW mode: The stor-
age tank coil is small.
Cooling mode:
1. The protection of the heat exchanger has not been removed. Re-
move the protection.
2. The heat exchanger is dirty or something is blocked on the surface.
Clean the heat exchanger or remove the obstruction.
1. The same reason as for P1.
2. The supply voltage of the unit is low, increase the supply voltage
to the required range.
1. The same reason as for P1.
2. The system is without refrigerant volume. Charge the refrigerant
at the right volume.
3. The sensor Tw_out temp. is loose. Reconnect it.
4. The sensor T1 temp. is loose. Reconnect it.
5. The sensor T5 temp. is loose. Reconnect it.
1. Check that all the shut-off valves of the water circuit are completely
open.
2. Check whether the water filter needs to be cleaned.
3. Chap. 9.5 Filling with water.
4. Make sure there is no air in the system (de-aeration).
5. Check the pressure of the water. The water pressure must be >1
bar (with cold water).
6. Check that the pump speed is set at the maximum speed.
7. Make sure that the expansion vessel is not damaged.
8. Check that the pressure drops of the hydraulic system are not too
high for the pump (Chap. 10.4 The circulation pump).
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