Abnormal Transmission Between The Remote Control Switch And The Indoor Unit; Abnormal Operation Of The Devices - Hitachi RAS-5HVRNM1E 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
299.

8.1.4 Abnormal operation of the devices

Phenomenon
Failure of the indoor unit
Failure of the outdoor
RUN LED is ON and the
LCD is indicated.
Failure of the magnetic
However, the system
switch for the outdoor
does not operate (For
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
SMGB0060 rev. 1- 12/2010
Cause
Disconnected wire to PCB
Failure of PCB
Cause
Disconnected coil
fan motor
Burnt-out coil
Disconnected coil
unit fan motor
Burnt-out coil
Insufficient contacting
unit fan motor
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
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)
switch, see on page 301.
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 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
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