Hitachi RAS-(4-6)HVRNS2E - Indication of Micro-Computer Input;Output

8 Troubleshooting
286
SMGB0064 rev.0 - 08/2011
PCB
Relay
Part name
YH2: Relay for drain pump (MD) and/or
dew heater (EHW).
52H: Relay for electric heater (CEH)
Y21: Relay for 4-way valve
Y52C: Relay for compressor
Y20A: Relay for Selonoid Valve (SVA2)
Y20B: Relay for Selonoid Valve (SVA1)
Y20F: Relay for Selonoid Valve (SVF)
Outdoor
Fan:
Relay for Outdoor Fan.
YCH: Relay for Cranckcase heater
(Note 1)
Indication of micro-computer input/output
12
Micro-computer input/
output in indoor unit
 
13
Micro-computer input/
output in outdoor unit
 
Indication of unit stoppage cause
14 Cause of stoppage
 
Abnormal operation occurrence counter
15
Abnormal operation
occurrence counter
 
16
Instantaneous power
failure occurrence
counter in indoor unit
 
17
Transmission error
occurrence counter
between remote control
switch and indoor unit
 
18
Abnormal operation
occurrence counter on
inverter
 
Indication of automatic louver condition
19 Louver sensor
 
: Normal
: Abnormal