Hitachi UTOPIA RAS-4HVRP2E - Initial Troubleshooting; Power Supply Failure to the Indoor Unit and the Remote Control Switch (PC-ARFP1 E); Ras-3 Hvrc2; Simple Checking Procedure by Means of the 7-Segment Display

10 Troubleshooting
Initial troubleshooting
SMGB0136 rev.0 - 07/2021
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10
10.1 Initial troubleshooting
10.1.1 RAS-3HVRC2
10.1.1.1 Simple checking procedure by means of the 7-segment display
1 Turn on the indoor unit connected to the outdoor unit.
2 Turn on the outdoor unit
3 Auto-addressing starts. (Outdoor unit printed circuit board PCB1).
During the auto-addressing, the following items can be checked by means of the 7-segment display of the outdoor unit.
• Disconnection of the power supply to the Indoor Unit.
• Disconnection of the operating line between the outdoor and the indoor units.
• Normal case:
The 7-segment display of the outdoor unit is not indicated.
• Abnormal case:
If there is something wrong, the 7-segment display of the outdoor unit displays the following indications:
Cause Indication Remarks
A. The indoor unit is not supplied with power.
03
Continuestoashafter30seconds.
B. Disconnection of the operating line between the outdoor units
and the indoor unit.
03
Continuestoashafter30seconds.
C. Duplicated settings of the indoor unit number on the rotary
switch RSW, see the description of the alarm code “35”).
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10.1.1.2 Power supply failure to the indoor unit and the remote control switch (PC-
ARFP1E)
• The LED and the Unit controller are not indicated.
• Not operated
If the fuses are blown out or a breaker is activated, investigate the cause of the overcurrent and take the necessary
action.
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Power failure or power is not ON
Measure the voltage by means of
the voltmeter
Supply the power
Blown out fuse or activation of
the breaker at the power source
Short circuit supplied
between the wires
Check for any uncovered part of
the wires
Remove the cause of the short
circuit and replace the fuse
Short circuit of the wires to
earth
Measure the insulation resistance
Remove the cause of the short
circuit and replace the fuse
Blown out fuse at the control
circuit
Short circuit supplied
between the wires
Check for any uncovered part of
the wires
Remove the cause of the short
circuit and replace the fuse
Short circuit of the control
circuit to earth
Measure the insulation resistance
Remove the cause of the short
circuit and replace the fuse
Disconnected cable of the remote control switch Connect the cable
Replace the cable or repair the
cable
Insufcientcontactingatthe
connectors of the remote control
switch
Insufcientconnectionor
incorrect connection of the
indoor unit PCB
Check the connectors Correctly connect the connector
Insufcientconnectionor
incorrect connection of the
indoor unit PCB in the remote
control switch
Failure of the remote control switch
Check the remote control switch
by means of the self-check mode
Replace the remote control
switch if it failed
Failure of PCB
Unconnected wires to PCB Check the connectors Correctly connect the wires
Failure of PCB
Check PCB by means of the self-
check mode
Replace PCB if it failed
Incorrect wiring connection
Take action according to the procedure explained in “7.3 Test run
using the PC-ARFP1E remote control switch (example)” chapter