Judgment Of Trouble By Every Symptom - Toshiba RAS-18YKH-E Service Manual

Details of Table 9-2-2

Judgment of Trouble by Every Symptom

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