67
Installation and Maintenance
Service Manual
12. Capacity charging malfunction PU
(AP1 below means control board of outdoor unit)
Main detection points:
Main detection points:
(1) wiring board XT (2) reactor Malfunction diagnosis process:
N
Y
N
Y
N
Y
N
Y
N
Y
to turn on the unit and
Put through the power
then wait for 1min
There's malfunction
for the voltage
detection circuit of
control board.
Measure the voltage at both
ends of electrolytic capacitor
with DC voltmeter.
Replace the control
board
Is the
voltage higher than 85% of
rated voltage?
Turn off the power
and maintain the
Measure the AC voltage between
terminal L and terminal N of wiring
board XT.
power supply to
make the voltage
resume to ±10%
of rated voltage.
Is the voltage is
within ±10% of rated
voltage?
Put through the
power and turn
on the unit again
Eliminate
malfunction
Check the connection status
of reactor (L in the electric
wiring diagram).
Connect the wires
of reactor L according
to the electric wiring
Wait for 20min after turning off the
power or use DC voltmeter to measure
the voltage at both ends of capacity
until it's lower than 20V.
diagram.
Is the wire connection
of reactor L normal?
Put through the
power and turn
on the unit again.
Eliminate
malfunction
Replace the control
board
End
9. Maintenance
