Lennox LI018CI-180P432 Service Manual page 49

1.Capacity charging malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit)
Main detection point:
● Detect if the voltage of L and N terminal of wiring board is between 210AC-240AC by alternating voltage meter;
● Is reactor (L) well connected? Is connection wire loosened or pull-out? Is reactor (L) damaged?
Malfunction diagnosis process:
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?
Measure the AC voltage between
terminal L and N on wiring board
XT(power supply)
Voltage within
210VAC~250VAC?
Shut down the power and wait 20 mi
use DC voltmeter to measure the voltage
on the two ends of capacitor (test3), until
the voltage is lower than 20V
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
reactor L is normal?
Replace the control
panel AP1
46
Fault with the voltage
testing circuit on
Y
control panel AP1
N
Shut down the power
and repair the power
N
supply to restore the
range
210VAC~250VAC
Y
nutes; or
Connect the reactor
Laccording to Elec-
N
trical Wiring Diagr-
am correctly
Y
End
Replace the control
panel AP1
power on and
If the fault is
restart the unit
eliminated?
N
Re-energize and If the fault is
turn on the unit eliminated?
N
Service Manual
Y
Y
Installation and Maintenance