Electrolux EXH09HL1W, Service Manual

Page: 47 / 62

210-10 ADL 47/62 599 75 60-77
(11) PFC Over Current Protection
HC is displayed on indoor unit
Yellow LED lamp of outdoor unit blinks for 14 times
# Check if the power supply voltage is normal
# Check if there is short circuit between any two pins. If so, IGBT is damaged. Replace the IGBT and turn on the unit again. If
IGBT is still burnt out, the PFC drive circuit is damaged, replace the mainboard.
# Check if voltage of PFC is normal (15V). If not, check switch power module.
(12) IPM Protection
H5 is displayed on indoor unit
Yellow LED lamp of outdoor unit blinks for 4 times
# Check if the compressor module is normal: check if it is short circuit of the outdoor unit mainboard bus bar (the left side of
R201, see test point 2) and phase U, V, W, check if it is short circuit of earth wire (Radiator U404, see test point 2) and phase
U, V, W, if so, the module is damaged. If not, check the AC with following steps
Because there are over 6 times of over
current protection for IPM module, refer
to recoverable conditions.
De-energize the unit and wait for at least
5min (when voltage between P and N is
lower than 40V). Unplug U,V,W terminals
connecting to compressor and check if
IGBT on IPM is damaged by universal
meter.
Replace IPM
module or
mainboard
Check if power supply (15V, detection
point 3) for IPM module is normal.
D304 or switch power board is
damaged Control terminal
inside IPM module
is damaged
Replace D304 or mainboard
De-energize the unit and wait for over 5min and then energize it again( set
COOL or HEAT mode). Observe if IPM protection occurs within 1min after
turning on the unit.
After turning on the unit, observe
if outdoor fan is operating (keep
operating for about 1min and
then stops operation)
Keep the unit operating and observe
if IPM module protection will occur
again.
Over current protection
occurs for power supply
module incurs IPM
module protection Normal IPM
protection which
may be incurred
by abnormal
power supply or
other reasons
Check if voltage of power supply is
lower than 165V; If condenser is
blocked; De-energize the unit and wait
for at least 5min. Then open outdoor
electric box to check if screws of IPM
module are screwed up. And check if
thermal grease is spread evenly.
Clean condenser of outdoor unit;
spread thermal grease on the bottom of
IPM module; reassemble IPM module.
IPM module protection occurs
（
H5 is displayed
on indoor unit
）
Wait over 3min and
，
check if the unit can resume
normal operation.
Recoverable Unrecovera
ble
Y N Y
N
Y
Normal Abnormal
N
Y
N
Check if
compressor is
damaged or
blocked. Replace IPM
module or
mainboard