27
ERROR
CODE
MALFUNCTION
OR PROTECTION
FAILURE CAUSE
AND CORRECTIVE ACTION
High pressure protection
Heating mode, DHW mode:
1. The water flow is low; water temp is high, whether there is air in
the water system. Release the air.
2. Water pressure is lower than 0.1Mpa, charge the water to let the
pressure in the range of 0.15~0.2Mpa.
3. Over charge the refrigerant volume. Recharge the refrigerant in
right volume.
4. Electrical expansion valve locked or winding connector is
loosen. Tap-tap the valve body and plug in/ plug off the connector
for several times to make sure the valve is working correctly. And
install the winding in the right location DHW mode: Water tank heat
exchanger is smaller .Cooling mode:
1.Heat exchanger cover is not removed. Remove it.
2. Heat exchanger is dirty or something is block on the surface.
Clean the heat exchanger or remove the obstruction.
Compressor overcurrent
protection.
1.The same reason to P1.
2. Power supply voltage of the unit is low, increase the power
voltage to the required range.
High discharge temperature
protection.
1.The same reason to P1.
2.TW_out temp.sensor is loosen Reconnect it..
3. T1 temp.sensor is loosen. Reconnect it.
4. T5 temp.sensor is loosen. Reconnect it.
Module protection
1. Power supply voltage of the unit is low, increase the power
voltage to the required range.
2. The space between the units is too narrow for heat exchange.
Increase the space between the units.
3. Heat exchanger is dirty or something is block on the surface.
Clean the heat exchanger or remove the obstruction.
4. Fan is not running. Fan motor or fan is broken, Change a new
fan or fan motor.
5. Over charge the refrigerant volume. Recharge the refrigerant in
right volume.
6. Water flow rate is low, there is air in system, or pump head is not
enough. Release the air and reselect the pump.
7. Water outlet temp.sensor is loosen or broken, reconnect it or
change a new one.
9.Module wires or screws are loosen. Reconnect wires and screws.
The thermal conductive adhesive is dry or drop.Add some thermal
conductive adhesive.
10.The wire connection is loosen or drop. Reconnect the wire.
11. Inverter module board is defective, replace a new one.
12. If already confirm the control system has no problem, then
compressor is defective, replace a new compressor.
13.The shut valves are closed,open the shut valves.