67
ERROR
CODE
MALFUNCTION
OR PROTECTION
FAILURE CAUSE
AND CORRECTIVE ACTION
Inverter 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.
8. Water tank heat exchanger is smaller than the required
1.7m2.(1016kW unit)or 1.4m2(5-9kW unit).
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. Drive 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.
Anti-freeze mode protection
Unit will return to the normal operation automatically.
High temperature protection of
refrigerant outlet temp. of
condenser.
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.
3. There is no enough space around the unit for heat exchanging.
4. fan motor is broken, replace a new one.
Water inlet temperature is
higher than water outlet in
heating mode
1.Check the resistance of the sensor.
2.The water inlet/outlet sensor wire connector is loosen. Reconnect it.
3.The water inlet/outlet
（
TW_in /TW_out
）
sensor is broken,
Change a new sensor.
4. Four-way valve is blocked. Restart the unit again to let the valve
change the direction.
5.Four-way valve is broken, change a new valve.
V.2
Summary of Contents for ETH220VMA
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