Lennox MS8 SERIES Installation And Service Procedures page 76

CAPACITOR CHARGE FAULT (OUTDOOR UNIT) (9-12K BTU SYSTEMS)
NOTE— Reactor (choke) line test procedure
reference here is applicable for both the
115V and 208-230V systems.
Switch unit on and wait one
minute.
Use DC voltmeter to measure the voltage
on the two ends of the capacitor.
Voltage higher than 103.5V
(115V units) and 187V for
208-230V units.
N
Measure the AC voltage between
terminals (L and N) or (L1 and L2) on
outdoor unit terminal strip.
Voltage within 103.5V and
126.5V for 115V units and
187-253V for 208-230V units)
Y
Switch off the power and wait 20 minutes; or
use DC voltmeter to measure the voltage on
the two ends of capacitor, until the voltage is
lower than 20V.
Is connection good?
Y
Replace the outdoor
control.
End
MS8C / MS8H (208-230V)
APPLICABLE ERROR CODE(S): PU, PH
VERIFY VOLTAGE
* 115VAC Systems: Use AC voltmeter to check voltage between L and
N on outdoor control.
There is a fault with the
tested circuit on the
Y
outdoor (control)
Switch off the power
and repair the supply
N power to restore the
previously reference
voltage ranges.
Check the reactor (choke) line connection on the
outdoor control to verify that it is connected using the
unit wiring diagram.
Reconnect to
N
terminal.
Replace outdoor
control
Restore
power and
switch on the
unit
N
Apply power
to unit and
turn on.
N
FIGURE 85
Page 76
Fault
Y
eliminated?
Did this eliminate
Y
the fault?