4 Troubleshooting
Analysis and countermeasure of abnormalities
SMGB0120 rev.0 - 11/2017
121
4
4.9
Analysis and countermeasure of abnormalities
Phenomenon
Cause
Check Item
Action · Countermeasure
No operation
at all, even
if performing
operation
activation
Power failure
Measure voltage with a
tester
Wait for power return
Power is not coming in
Check main power switch
Turn main power switch ON
Power source
fuse blown
Short circuit between wires
Check wire coating
damage
Replace fuse after correcting
short circuit
Ground fault (Earth) of
wiring
Measure insulation
resistance
Replace fuse after correcting
ground fault
Faulty compressor motor
Measure resistance
between wires and
insulation resistance
Replace compressor and fuse
Control circuit
fuse blown
Short circuit between wires
Check wire device damage
Replace fuse after correcting
short circuit
Ground fault (Earth) of
control circuit
Measure insulation
resistance
Replace fuse after correcting
ground fault
Faulty electromagnetic
contactor coil of compressor
motor
Measure the coil
resistance
Replace electromagnetic
contactor and fuse
Faulty electromagnetic
switch coil of pump motor
Faulty coil of the auxiliary
relay
Replace auxiliary relay and
fuse
Faulty solenoid valve coil
Replace solenoid valve and coil
Faulty oil heater
Adherence of conductive
dirt
Remove dirt and replace fuse
Faulty transformer coil
Measure secondary
voltage of transformer
Replace transformer
Miswiring of remote control wiring
Check wiring
Change wiring
Open phase or reverse phase connection of
power source phases R, S, T
Check connection of R, S,
T phases
Connect in-phase.
Defective remote control switch
PCB switch is set to "Local".
Check the direction of the
switch
Replace remote control switch,
and set switch to "Remote".
Faulty PCB
Bad connection of wiring
Check connection with a
tester
Correct wiring connection
Faulty PCB
Replace PCB
Faulty
electromagnetic
switch of Pump
(52C)
Disconnection of coil
Replace electromagnetic
switch of pump
Bad connection of contact
Voltage measurement
between contacts of
electromagnetic switch
Pump stops
before
compressor
operation.
Activation of
electromagnetic
relay for pump
(51P)
Pump locked
Check frozen water,
clogging by foreign bodies,
etc.
Remove
Inappropriate RC value of
overcurrent relay for Pump
Check RC value and pump
operating current
Change RC value or replace
electromagnetic switch
Faulty overcurrent relay for
Pump
Press reset button.
Check running current
Replace electromagnetic
switch