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
C1
13
Micro-computer input/
output in outdoor unit
C2
Indication of unit stoppage cause
14 Cause of stoppage
d1 01
Abnormal operation occurrence counter
15
Abnormal operation
occurrence counter
E1 01
16
Instantaneous power
failure occurrence
counter in indoor unit
E2 00
17
Transmission error
occurrence counter
between remote control
switch and indoor unit
E3 00
18
Abnormal operation
occurrence counter on
inverter
E4 00
Indication of automatic louver condition
19 Louver sensor
F1 00
00: Normal
FF: Abnormal
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