Mitsubishi Electric E Series, Service Handbook

Page: 130 / 170

[
IX
Troubleshooting ]
- 121 -
HWE1417B GB
Problem Check item Cause Solution
The unit has
stopped during
operation and
does not restart.
Automatic Start/Stop
thermistor has tripped.
Water temperature is
high.
Normal
Water temperature is
low.
The setting for the automatic Start/Stop
thermistor is too low.
Change the setting for the automatic Start/
Stop thermistor.
The high-pressure
switch has
tripped.1302, 1303
Water temperature is
not high.
Dirty condenser Clean the condenser.
Refrigerant overcharge Evacuate the system, and charge the sys-
tem with refrigerant.
Air in the refrigerant circuit Evacuate the system, and charge the sys-
tem with refrigerant.
Water flow shortage Secure enough water flow rate.
The vacuum protection
has tripped.
1301
Outdoor temperature is
not low.
Refrigerant undercharge, refrigerant
gas leakage
Perform a leakage test, repair the leaks,
evacuate the system, and charge the refrig-
erant circuit with refrigerant.
Dirty evaporator Clean the evaporator.
LEV fault in the main circuit Replace the LEV in the main circuit.
Clogged strainer Replace the strainer.
Clogged check valve Replace the check valve.
Excessive frosting Install a snow hood to keep snow from ac-
cumulating on the unit.
The discharge
temperature thermistor
has tripped.
1102
Suction gas is
overheated.
Refrigerant undercharge, refrigerant
gas leakage
Perform a leakage test, repair the leaks,
evacuate the system, and charge the refrig-
erant circuit with refrigerant.
LEV fault in the main circuit Replace the LEV in the main circuit.
Clogged strainer Replace the strainer.
The cooling fan is stopped. Check the fan for proper operation, and re-
place it if necessary.
High pressure is too high. Check the items above and make neces-
sary adjustments so that the suction gas
temperature falls within the specified tem-
perature range.
The unit has
stopped during
operation and
does not restart.
Overcurrent
passed through the
compressor.
4250
Outdoor temperature is
high.
Overload operation
Burnt motor
Seized compressor
Reduce the operation load, and check the
operation patterns.
Replace the compressor.
A water supply cutoff
was detected.
2500, 2501, 2550
The pump is operating
normally.
Water flow shortage Increase the water flow rate.
Flow switch fault Replace the flow switch.
The pump does not
operate.
Problem with the solenoid contactor for
the pump
Replace the electromagnetic contactor.
Pump fault Replace the pump.
The freeze-up
protection function has
tripped.
1503
Water flow shortage Plate heat exchanger freeze-up Increase the water flow rate.
The water flow rate is
sufficient.
4-way valve fault Replace the 4-way valve.
The unit is in
operation, but the
water does not
heat up/cool
down.
Water temperature is
low/high.
The water inlet/outlet
temperature differen-
tial is normal.
The water-heating/cooling load is too
high.
Install more units
Low refrigerant charge due to a leak. Perform a leakage test, repair the leaks,
evacuate the system, and charge the refrig-
erant circuit with refrigerant.
The water inlet/outlet
temperature differen-
tial is small.
LEV fault in the main circuit Replace the LEV in the main circuit.
Compressor failure Replace the compressor.
High pressure is too high, or low pres-
sure is too low.
Operate the units within the specified pres-
sure range.
Water temperature is
high/low.
Water flow shortage Increase the water flow rate.
Problem with the external devices Repair the devices.
The unit is mak-
ing a great deal of
vibrations and
noise.
The compressor is
being flooded.
LEV fault in the main circuit Replace the LEV.
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