Troubleshooting - Hitachi HC-A32MB Installation And Operation Manual

Troubleshooting

4. Troubleshooting
Nº ALARM CODE
→61
1
→63
2
3 D7 is always OFF
4 D12 is never flickering
5 D13 is not flickering
D4 & D11 are not
6
flickering
0
O→88
7
88
Where is a
number.
DESCRIPTION
Indoor Units have not communicated
with HC-A32MB for more than 10
min.
Indoor Units have never
communicated with HC-A32MB
No LED is flickering on PCB and 7
segments are OFF
HC-A32MB is not reading/sending
data (D12 is never flickering)
HARC is not operating
(D13 is not flickering)
There is no H-LINK communication
from HC-A32MB
O
HC-A32MB starting shows
and the firmware version number.
If Modbus wiring is wrong, they will
be showed all time.
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 Nº1, countermeasure 1
1. Check the Modbus wiring connection.
PMML0191A rev.2 - 05/2013
21