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Trane Manuals
Heat Pump
A4AC4018B1000B
Installer's manual
Trane A4AC4018B1000B Installer's Manual page 24
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Troubleshooting
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Compressor won't run
Contactor is closed
Check for high
voltage to contactor
Is high voltage present
at T1 and T2 ?
Check power
supply from
disconnect and/or
breaker panel.
24
TROUBLESHOOTING
Check for open IOL
YES
(Internal Overload)
Check resistance of
C to S and C to R
NO
Does the
resistance check
show an open
circuit from C to S
or C to R?
Check for open
windings.
Does a resistance check
show an open circuit
between R and S?
Check for locked
rotor
Is voltage present
at C to S and C
to R with locked
rotor amps on C?
Check wiring to
compressor
C, S and R
Allow compressor
YES
time to cool and
re-test
NO
YES
Replace the
compressor
NO
Check Start-
YES
Capacitor and
Relay (if present)
and Run Capacitor
NO
Do the start
components and
run capacitor
check good?
Replace start
components and/
or run capacitor
YES
Replace the
compressor
NO
88-A4AC4001-1F-EN
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A4ac4060a1000b
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