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 Section V. TROUBLESHOOTING
4-8. General
This manual cannot list all the malfunctions that
This section contains troubleshooting for locating
m a y occur nor all tests or inspections and corrective
a n d correcting most of the operating troubles which
actions. If a malfunction is not listed or is not
may develop in the air conditioners. Malfunctions
corrected by listed corrective actions. notify your
which may occur are listed in Table 4-2. Each
supervisor.
malfunction for an individual component, unit, or
s y s t e m is followed by a list of tests or inspections
NOTE
which will help you to determine probable causes
Before you use this table, be sure you have performed
a n d corrective actions to take. You should perform
all applicable operating checks.
the
tests/inspections
and
corrective
actions
in
the
order listed.
Table 4-2.
Troubleshooting
Malfunction
Corrective
Action
Probable
Cause
a.
Motor
defective.
1. F a n m o t o r w i l l n o t r u n .
b.
Open
thermal
overload
protector
on
motor.
motor (para 4-34).
c. Refer to fig. 1-5 for electrical
c.
Defective wiring in motor
control
checkpoints.
Check connectors for
and power circuits.
tightness
and
wiring
for
d.
Defective
fan
speed
e.
Defective
motor
run
capacitor.
f. D e f e c t i v e
mode
selector
switch.
g. C o n d e n s e r o r
fan
binding.
a.
Defective wiring in motor control
2. Fan motor runs at low speed only.
and power circuits.
c. R e p l a c e f a n s p e e d r e l a y ( p a r a 4 -
52).
d. R e p l a c e c a [ a c o t p r ( p a r a 4 - 4 7 ) .
e. R e p l a c e t i m e d e l a y r e l a y ( p a r a 4 -
40).
f. R e p l a c e f a n s p e e d s w i t c h ( p a r a 4 -
46).
g. S e e m a l f u n c t i o n n u m b e r 5 .
Fan motor runs correctly.
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