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5
AIR CONDITIONER
TROUBLESHOOTING
AIR CONDITIONER
“4. Disassembly and assembly, Air conditioner”
A The outlets temperature cannot be changed
Note:
1. After completion of repair work, make sure to reinstall the connectors removed for inspection.
2. Check if there is warm water at the IN side of the water valve.
3. By referring to the wiring diagram, check for continuity of the lines between the air conditioner harness connectors
beforehand.
The attenuator is
faulty
Replace
Check the temperature controlling operation
YES
T
urn on the starter switch and then the air conditioner
switch (10R20R3). Turn the attenuator and check if the
voltage changes from 0 to 5 V between the following
wires of Connector (2).
• The green/black and green/white
• The green/black and yellow/black
(See the description about the temperature adjusting
switch below.)
NO
Is
the voltage be-
tween
the green/
black and yellow/
white wires 5 V?
NO
Replace the amplifier
YES YES
Does
the water valve rod in the control box move with
the output of the temperature control dial?
YES
W
ater valve is
faulty
Remove Connectors (1) and (2).
Check for continuity of the wires (yel-
low/white,
yellow/black, green/white,
green/black of Connector (1)) and Con-
nector (2)
NO NO
Repair the wire break/disconnection
Check if something is interfering with the link of the wa-
ter
valve assembly or the operation of the water valve
motor actuator. Is there anything interfering?
YES
Remove
the interfering thing or repair
or replace faulty parts
NO
T
urn off the starter switch and remove Connectors (1),
(11), (12). Check for continuity in the wires (light green,
blue, yellow, green/yellow, red/white, white) of Connec-
tors (1) and (11). Ar
e they electrically continuous?
NO
Repair the wir
e break/disconnection
YES
Check
for mutual short-circuiting in the six wires con-
necting
the motor actuator and the lamp. Is there a
short circuit?
YES
After
repairing, perform a test opera-
tion.
If the problem still exists, replace
the control amplifier (it could be dam-
aged by short-cir
cuiting)
NO
Replace
with a water valve motor actuator for testing,
and connect the connectors removed. Perform a test
operation. Is the operation normal?
NO
Contr
ol amplifier
is faulty
Replace the contr
ol amplifier
YES
W
ater valve motor
actuator is faulty
Replace
the water valve motor actua-
tor
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