113
8-3-4. How to diagnose by check code
Failure mode detected by the Hydro Unit
Check
code
Diagnostic functional operation
Determination and action
Number of
abnormalities
for
confirmation
Detailed
item
Operational cause
Backup
operation
Automatic
reset
A01
Flowing quantity failure
8 106
A02
Temperature increase failure
O
1.
sensors.
2.
1 107
A03
Temperature increase failure
O
Hot water
O
1.
2.
1 108
A04
Antifreeze operation (1)
O
•
•
short.
•
•
heater.
Hot water 8
109
A05
Piping antifreeze operation
of TWO < 4 or TWI < 4 or THO < 4 does
O O
1.
2.
3.
1 110
A08
Low pressure sensor operation
failure
O
1.
2.
3.
4.
5.
8 111
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