Dsw Setting And Led Indication; Troubleshooting - Hitachi PC-ARF Technical Catalogue

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8 Control support devices

8.5.3.3 DSW Setting and led indication

Setting of DIP switches

DSW1: Not used

Factory setting

(Do not change)

LED indication

Monitor led 1 is ON while PC-AMTB is power supplied.

Monitor led 2 flickers from time to time when there is traffic at HLINK bus 1.

Monitor led 3 flickers from time to time when IU is ON and there is traffic at HLINK bus 2.

Monitor led 4 is used for system diagnosis.

The indoor unit is not recognized by the outdoor unit despite being powered ON.

Check that PC-AMTB is power-supplied by checking monitor LED1. If it is OFF, please check fuse state, and in case it is

fused, replace it by a 5x20 mm, 250 mA, 250V compatible fuse.

TCGB0106 rev.0 - 12/2014