Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
336
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Power failure or no power supply
Measure the voltage
using the tester
Supply the power
Blown out fuse
for the power
source or ac-
tivation of the
outdoor unit
breaker
Short circuit between wires
Check the insulation
material for breaks
Remove the short circuit and
replace the fuse
Short-circuited wire to ground
Measure the insulation
resistance
Remove the short circuit to
ground and replace the fuse
Faulty comp. motor
Measure the resistance
between the wires and
the insulation resistance
Replace the comp.
and the fuse
Faulty outdoor unit fan motor
Measure the resistance
between the wires and
the insulation resistance
Replace the outdoor unit fan
motor and the fuse
Blown out fuse
for
control circuit
or activation
of outdoor unit
breaker
Short circuit between wires
Check the insulation
material for breaks
Remove the short circuit and
replace the fuse
Short circuit of the control
circuit (to ground)
Measure the insulation
resistance
Remove the short circuit and
replace the fuse
Faulty solenoid coil for the magne-
tic switch for the comp. motor
Measure the
resistance of coil
Replace the magnetic switch
and the fuse
Failure of the outdoor unit
fan motor
Measure the resistance
between the wires and
the insulation resistance
Replace the outdoor unit fan
motor and fuse
Faulty transformer
Measure input voltage
(PCB1 output voltage)
*1)
Replace transformer
Disconnected
wires insuffi -
cient contacting
or incorrect
connection
Between outdoor unit and indoor
unit
Check the continuity
of the wires. Check for
looseness of the con-
nection screws. Check
the terminal nos.
Replacing wires repairing and
tightening the screws and the
correct wiring
Power source wiring for the outdo-
or unit
Faulty PCB
(outdoor unit,
indoor unit)
Disconnected wires to PCB Check the connections Correctly connect the wires
Faulty PCB - Replace PCB if faulty
Incorrect wiring
Disconnected wire; insufficient
contacting
Check the continuity
and the looseness of
connection screws
Replacing wires, repairing and
tightening the screws
Incorrect wiring Check the terminal nos Correctly connect the wires
*1)
PCB1 output voltage Voltage
Vcc 12 - GND2 12VDC
Vcc 05 - GND1 5 VDC
Vcc 15 - GND1 15 VDC
Vcc 24 - GND1 24 VDC
Vcc 12T - GND1 12 VDC