Abnormal Transmission Between The Remote Control Switch And The Indoor Unit; Abnormal Operation Of The Devices - Hitachi RAS-(3-6)HVRNM2E 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 of the remote control
• *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
Failure of the outdoor
unit fan motor
RUN LED is ON and
the LCD is indicated.
Failure of the magnetic
However, the system
switch for the outdoor
does not operate (For
unit fan motor
example, the indoor
fan, the outdoor fan or
the compressor does
not operate)
Failure of the magnetic
switch for comp.
Failure of one of PCBs
198
SMGB0064 rev.0 - 08/2011
Cause
Disconnected wire to PCB
Failure of PCB
Cause
Disconnected coil
fan motor
Burnt-out coil
Disconnected coil
Burnt-out coil
Insufficient contacting
Failure of the comp. motor
Failure of the comp.
Insufficient contacting
Disconnected wiring
to PCB
Failure of PCB
Check item
Check the cable and the connec-
tions
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)
switch, see on page 301.
Check item
Measure the coil resistance by
means of the tester
Measure the insulation resist-
ance
Measure the coil resistance by
means of the tester
Measure the insulation resist-
ance
Measure the voltage between
the contacting parts
Measure the resistance be-
tween two wires
Check for an abnormal sound
from the Comp.
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, see on page 299.
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