Abnormal Transmission Between The Remote Control Switch And The Indoor Unit; Abnormal Operation Of The Devices - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
8.1.3 Abnormal transmission between the remote control switch and the indoor unit
RUN LED on the remote control switch:
•
Flickering every 2 seconds.
Phenomenon
Disconnection or insufficient contacting of the remote control
cable
Failure of the remote control switch
Failure of PCB (in the indoor
unit and the remote control
switch)
N O T E
• *1): Refer to section "Self-checking procedure of the remote control switch"
• *2): Refer to section "Self-checking procedure of PCB by means of the Remote Control
8.1.4 Abnormal operation of the devices
Phenomenon
Failure of the indoor
unit fan motor
Failure of the outdoor
unit fan motor
RUN LED is ON and
Failure of the
the LCD is indicated.
magnetic switch for
However, the system
the outdoor unit fan
does not operate
motor
(For example, the
indoor fan, the
Failure of the comp. motor
outdoor fan or the
compressor does not
operate) Failure of the compressor
Failure of the mag-
netic switch for comp.
Failure of one of
PCBs
210
SMGB0087 rev.0 - 12/2013
Cause
Disconnected wire to PCB
Failure of PCB
Cause
Disconnected coil
Burnt-out coil
Disconnected coil
Burnt-out coil
Insufficient contacting
Insufficient contacting
Disconnected wiring
to PCB
Failure of PCB
Check item
Check the cable and the
connections
Check the remote control
switch by means of the
self-check mode *1)
Check the connectors
Check PCB by means of the
self-check mode *2)
Check item
Measure the coil resistance
by means of the tester
Measure the insulation
resistance
Measure the coil resistance
by means of the tester
Measure the insulation
resistance
Measure the voltage
between the contacting parts
Measure the resistance
between two wires
Check for an abnormal
sound from the compressor
Check that the magnetic
switch activates correctly
or not
Check the connections
Check PCB by means of the
self-check mode *1)
Action
(Turn OFF the main switch)
Repair the cable or connect the
cable
Replace the remote control
switch if the remote control
switch is faulty
Correctly connect the wires
Replace PCB if it failed
Switch".
Action
(Turn OFF the main switch)
Replace the Indoor unit fan
motor
Replace the outdoor unit fan
motor
Replace PCB for the outdoor
unit
Replace the compressor
Replace the magnetic switch
Correctly connect the wiring
Replace PCB if it failed