Troubleshooting - Hitachi HARC-MODBUS Installation And Operation Manual

HARC-MODBUS - Installation Manual
18 HARC-MODBUS - xxxxxxxxxxxxxxxxxx

7. Troubleshooting

Nº Alarm Code
Ö
1
Ö
2
3 D7 is always OFF
4 D12 is never flickering
5 D12 is not flickering
D4 & D11 are not
6
flickering
Description
Indoor Units have not communicated
with HARC-MODBUS for more than
10 min.
Indoor Units have never
communicated with HARC-MODBUS
No LED is flickering on PCB and
7 segments are OFF
HARC-MODBUS is not reading/
sending data (D12 is never flickering)
HARC is not operating
(D13 is not flickering)
There is no H-LINK communication
from HARC-MODBUS
Countermeasure
1. Ensure that H-LINK connection is correctly done
in HARC (K1) and also Indoor Units.
2. Ensure that Power are supplied to Air Conditioners.
1. Ensure that H-LINK connection is correctly done
in HARC (K1) and also in Indoor Units.
2. Ensure that Power are supplied to Air Conditioners.
1. Ensure that 230 are supplied to Power Source.
2. Ensure that +5V DC is supplied to K3.
Notes:
- Power source output DC signal has a rotary switch
that must be correctly set to get +5V DC.
- D7 must be in ON.
1. Check connection between MODBUS devices
and K5.
1. Check SW3 is in RUN position. If no, set RUN
and push reset.
1. D4 is flickering but D11 is not flickering.
See line Nº6, countermeasure 1.
2. D4 neither D11 are not flickering.
See line Nº3, countermeasure 1.
PMML0175A-rev.1 - 6/2008