Hitachi RAS-(3-6)HVNC1(E) Service Manual page 298

8 Troubleshooting
If you are using a wireless remote control switch with the built-in receiver part of the wall-type indoor unit and you need to
perform the above checking, perform the following procedure:
1 Turn OFF the power supply.
2 Disconnect the connector (CN25) on PWB(M).
3 Connect the PC-ART.
4 Turn ON the power supply.
After finishing the checking, turn OFF the power supply again and reconnect the connectors according to the previous
situation before the checking.
From previous page
Result
After 1 second
Repeat
Release PCB check mode
N O T E
• If this indication continues and the alarm code "1" is not displayed, this means that each one of indoor unit is not con-
nected to the remote control switch. Check the wiring between the remote control switch and the indoor unit.
• In this troubleshooting procedure, checking of the following parts of the PCB is not available.
PCB in indoor unit: relay circuit, DIP switch, option circuit, fan circuit, protection circuit.
PCB in outdoor unit: relay circuit, DIP switch, option circuit.
• If this troubleshooting is performed in the system using the central station, the indication of the central station may
change during this procedure. However, this is not abnormal.
• After this troubleshooting, the memory of the abnormal operation occurrence counter, which was described before, will
be deleted.
284
SMGB0087 rev.0 - 12/2013
If there is a next unit
Press
Press
Press
(ex.) Indication of unit No. "
After 1 to 5 seconds
After 7 seconds
1 "