Fault Diagnosis Process - Lennox LI036CI-180P432 Service Manual

Service Manual
Outdoor unit
(1) Capacitor charge fault (Fault with outdoor unit) (AP1 below refers to the outdoor control panel)
Main Check Points:
Use AC voltmeter to check if the voltage between terminal L and N on the wiring board is within 210VAC~240VAC.
If the reactor (L) is correctly connected? If the connection is loose or fallen? If the reactor (L) is damaged?

Fault diagnosis process:

use DC voltmeter to measure the voltage
on the two ends of capacitor , until
the voltage is lower than 20V
Installation and Maintenance
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor
Voltage higher than 200V?
Y
N
Measure the AC voltage between
terminal L and N on wiring board
XT(power supply)
Voltage within
210VAC~250VAC?
Y
Shut down the power and wait 20 minutes;or
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
N
reactor L is normal?
Y
Replace the control
panel AP1
End
Fault with the voltage
Replace the control
testing circuit on
control panel AP1
Shut down the power
power on and
and repair the power
N
supply to restore the restart the unit
range
210VAC~250VAC
Connect the reactor
Laccording to Elec-
Re-energize and
trical Wiring Diagr-
turn on the unit
am correctly
N
panel AP1
If the fault is
eliminated?
N
If the fault is
eliminated?
Y
Y
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