ES AWH11-V5+, User Manual

Page: 77 / 86

4.8 Trouble shooting
4. Maintenance
Failure
1. No power supply
2. Fuse is broken or circuit
breaker is disconnected
2. Check if it's open circuit or if the unit is earthed.
Then change a fuse and reset the breaker, check if the
circuit is stable or the connection is well.
3. Some kind of protection works
3. Check which protection is working, and clear the
protection, then restart the unit.
4. Wiring is loose
4. Check the wire connection and tighten the screws on the
terminal
5. compressor fails 5. Change a compressor
1. Fan motor wire loose 1. Check the wire connections.
2. fan motor failure
2. Change fan motor.
1. The coil fins are very dirty
2. Air inlet is blocked
3. Insufficient of refrigerant
1. Clean the evaporator coil
2. Remove any object that blocks the air circulation of the
unit.
3. Inspect the unit for leakage and fix it if any.
Discharge all refrigerant and charge the unit again with
correct amount.
1. Lacking of water in water
system
2. Air exists in water system
3. Valves in water system are
not completely opened
4. Water filter is dirty or blocked
1. Check the water filling device. Fill the system with
enough water.
2. Purging the air out.
3. Check all the valves to ensure they are fully opened.
4. Clean the water filter
Cause Solution
1. Check the power supply
1. Too much refrigerant
2. Air exists in refrigerantion
system
3. Inadequate water flow
4. Too high water temperature
1.Discharge all refrigerant and charge the unit again with
right amount.
2. Discharge all refrigerant and charge the unit again with
right amount.
3. Check the water flow of the system. Use a bigger pump
to increase the water flow if necessary.
4. Check the value of the water temperature sensor, to
ensure it works properly.
1. Drier filter is blocked
2. Electronic expansion valve is
not opened
3. Leakage of refrigerant
1. Change a new one
2. Repair or change a new one
3.Inspect the unit for leakage and fix it if any.
Discharge all refrigerant and charge the unit again with
right amount.
Unit can’t start up
Fan fails to run
Low heating
performance
Too high noise from
the water pump, or
no water flow
when the water pump
is running
Too high compressor
discharge pressure
Too low suction
pressure
Unit can not defrost
properly
1. Coil temperature sensor failure
2. Air inlet/outlet is blocked
1. Check the position and value of the coil temperature
sensor. Replace it if necessary.
2.Remove any object that blocks the air circulation of the
unit. Clean the evaporator coil occasionally.
77