Section 11: Fault Finding Page 57
Error
code
Error Method of check Troubleshooting
Figure/
table
Error
reset
C8 Main PCB error Main PCB
Turn off the power supply, wait for about 3
minutes, then power up again
If the same error code appears,
Main PCB should be replaced
-
Power
OFF
Check loose cable connections and contacts
of reactor
E4
Outgoing water
temp. sensor error
Sensor, Temp.
Outgoing water
Check the resistance by tester If the sensor is faulty, it should be replaced
Figure
11-15
Auto
E5
Return water temp.
sensor error
Sensor, Temp.
Return water
Check the resistance by tester If the sensor is faulty, it should be replaced
FU
High pressure switch
is operating
(HPID13R32 &
HPID17R32)
Outside air
recirculation
Check temperature difference of Outgoing/
Return water (see Monitor display function)
Large difference means flow rate is too low
Make sure the position doesn’t block the air
inlet and outlet
-
Manual
Clogged water
circuit
Remove the blockage, then restart operation
P1 Pump error
Pump (*2)
Check the voltage of Pump
If the voltage is normal, Pump should be
replaced
If the voltage is abnormal, Main PCB should
be replaced
Figure
11-6
Main PCB
The pump is
blocked/air-locked
or water circuit
restricted.
Check the pump and water circuit Remove the blockage, then restart operation -
P3
High pressure switch
error
(HPID13R32 &
HPID17R32)
High pressure switch Check loose cable connections and contacts
If the same error code appears, high pressure
switch should be replaced
-
Power
OFF
U1
Compressor
overheat protection
relay operation
(HPID13R32 &
HPID17R32)
Compressor
overheat protection
relay
Check the resistance by tester
If the compressor overheat protection relay is
blown, it should be replaced
Figure
11-10
Manual
Gas leakage
Check the service valve and refrigerant circuit
(pipe)
Correct refrigerant once, then recharge with
prescribed mass
-
Water not getting warm
Fuse CF2
0639U : 250V T3.15A
1039U : 250V T3.15A
1639U : 250V T5A
Check the electric continuity of Fuse CF1 by
tester
If CF2 is blown,it should be replaced and
check the resistance of 4way valve and the
resistance of Defrost heater by tester
Figure
11-9
-
4way valve Check the resistance of 4way valve by tester If 4way valve is blown,it should be replaced
Figure
11-7
Defrost heater
Check the resistance of Defrost heater by
tester
If Defrost heater is blown,it should be replaced
Figure
11-8
Short cycle
(insufficient air
circulation)
Check the blockage of air inlet & outlet
Ensure the installation position to avoid
blockage of air inlet & outlet
-
Sensor,Temp.
Outgoing water and
Return water
Check the resistance by tester
If any of these sensors is faulty, it should be
replaced
Figure
11-15
Gas leakage
Check the service valve and refrigerant circuit
(pipe)
After fixing the leakage point,collect the
refrigerant once,then recharge with prescribed
mass
-
Clogged water
circuit
Check temperature difference of Outgoing/
Return water (see Monitor display function)
Large difference means flow rate is too low
Remove the blockage,then restart operation -
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