Hitachi UTOPIA RAS-4HVRP2E - Abnormal Operation of the Devices

10 Troubleshooting
Initial troubleshooting
SMGB0136 rev.0 - 07/2021
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10
10.1.2.5 Abnormal operation of the devices
In the case no anomalies are detected (alarm codes) in the remote control switch, and normal operation is not available,
carry out the required actions in accordance with the procedures described below.
“RUN” light is ON
and LCD is indicated.
However, the system
does not operated.
(ex. The indoor,
outdoor fans or
compressor does not
operate).
The Compressor
does not stop or start
even if the setting
temperature on LCD
is changed (**)
Measure coil resistance by
tester
Measure insulation
resistance
Measure insulation
resistance
Measure resistance between
wires
Check for abnormal sound
from compressor
Check magnetic switch
activates correctly or not
Check connections
Check PCB by self-checking
Check PCB by self-checking
Check it by Check mode (*)
Check it by Test Run
Measure coil resistance by
tester
Replace indoor unit fan
motor
Replace outdoor unit fan
motor
Replace compressor
Replace magnetic switch
Correctly connect wiring
Replace PCB if failed
Replace PCB if failed
Replace or correctly connect
wires if abnormality exists
Disconnected
Coil
Disconnected
Coil
Burnt-Out Coil
Burnt-Out Coil
Failure of
Indoor Unit Fan
Motor
Failure of
Outdoor Unit
Fan Motor
Failure of
Magnetic Switch
for Compressor
Insufcient
Contacting
Disconnected
Wiring to PCB
Failure of PCB
Failure of
Thermistor
Disconnection
of Thermistor
Abnormality of Remote Control
Switch Cord
Failure of Indoor Unit PCB
Failure of One
of PCBs (for
outdoor unit,
indoor unit,
remote control
switch)
Failure of Air
Inlet Thermistor
Failure of Compressor Motor
Failure of Compressor
Phenomenon
Cause
Check Item
Action (Turn OFF
Main Switch)
Failure of
Outdoor Unit
PCB
Contact failure
Measure voltage between
contacting parts
Replace outdoor unit PCB1