Analysis And Countermeasure Of Abnormalities - Hitachi SAMURAI Series Service Manual

4. Troubleshooting

Analysis and countermeasure of abnormalities

4.9 Analysis and countermeasure of abnormalities
Phenomenon
Power is not coming in
Power
source
fuse blown
Control
circuit fuse
blown
No operation
at all, even
if performing
operation
activation
Miswiring of remote control wiring
Open phase or reverse phase connection of
power source phases R, S, T
Defective remote control switch
PCB switch is set to "Local".
Faulty
PCB
Faulty
electro-
magnetic
switch
of Pump
(52C)
Activation
Pump stops of electro-
before magnetic
compressor relay for
operation. pump
(51P)
121
SMGB0097 rev.0 - 07/2015
Cause
Power failure
Short circuit between wires
Ground fault (Earth) of
wiring
Faulty compressor motor
Short circuit between wires
Ground fault (Earth) of
control circuit
Faulty electromagnetic
contactor coil of compressor
motor
Faulty electromagnetic switch
coil of pump motor
Faulty coil of the auxiliary
relay
Faulty solenoid valve coil
Faulty oil heater
Faulty transformer coil
Bad connection of wiring
Faulty PCB
Disconnection of coil
Bad connection of contact
Pump locked
Inappropriate RC value of
overcurrent relay for Pump
Faulty overcurrent relay for
Pump
Check Item
Measure voltage with a tester
Check main power switch
Check wire coating damage
Measure insulation resistance
Measure resistance between
wires and insulation resistance
Check wire device damage
Measure insulation resistance
Measure the coil resistance
Adherence of conductive dirt
Measure secondary voltage of
transformer
Check wiring
Check connection of R, S, T
phases
Check the direction of the
switch
Check connection with a tester
Voltage measurement between
contacts of electromagnetic
switch
Check frozen water, clogging
by foreign bodies, etc.
Check RC value and pump
operating current
Press reset button.
Check running current
Action · Countermeasure
Wait for power return
Turn main power switch ON
Replace fuse after correcting
short circuit
Replace fuse after correcting
ground fault
Replace compressor and fuse
Replace fuse after correcting
short circuit
Replace fuse after correcting
ground fault
Replace electromagnetic
contactor and fuse
Replace auxiliary relay and fuse
Replace solenoid valve and coil
Remove dirt and replace fuse
Replace transformer
Change wiring
Connect in-phase.
Replace remote control switch,
and set switch to "Remote".
Correct wiring connection
Replace PCB
Replace electromagnetic switch
of pump
Remove
Change RC value or replace
electromagnetic switch
Replace electromagnetic switch
4