– 25 –
Is operation of
four-way valve normal?
Does LED (Orange) on
outdoor P.C. board flash?
Is connection of
connector normal?
Are 1, 2, and 3 crossover
wires normal?
NO
YES
YES
YES
Correct crossover wires.
Correct connection
of connector.
Check outdoor P.C. board.
Failure
Check indoor P.C. board.
Failure
NO
NO
NO
NO
YES
NO
YES
YES
NO
YES
NO
NO
NO
YES
YES
YES
Is characteristic of
TC sensor resistance
value normal?
• Refer to the Characteristic diagram.
10k at 25˚C
Replace
Does LED (Green) on
outdoor P.C. board flash?
Are circuit
wires normal?
Outdoor P.C. board
check?
Unsatisfied
Satisfied
Four-way valve check
Failure
Circuit check/modification
(CN11 220–240V)
Outdoor P.C. board check
Failure
Replace TC sensor.
Indoor P.C. board check
Failure
Has coil
terminal 220–240V
in heating?
Replace
P.C. board.
Replace
P.C. board.
Replace
P.C. board.
Replace
P.C. board.
Does outdoor
unit operate?
Does LED (Orange)
on indoor
P.C. board flash?
Details of Table 9-2-2
Judgment of Trouble by Every Symptom
[04 Serial signal error]
[08 Four-way valve error]
