Friedrich FPHFC36A3B Wi-Fi Service & Parts Manual page 121

Test System Flow
Unsolder the capillary tube
ASS'Y(or electronic expansion
valve). Clear the capillary tube
with compessed nitrogen.
NO
121
COMPONENTS TESTING
Cooling mode
Test system
The pressure is high.
pressure. Is the
pressure normal at the
low service port ?
Recharge refrigerant
after air purging with
The pressure is low.
pump. Is the low
pressure normal?
The system needs
refrigerant.
Recharge refigerant.
Did the low pressure rise ?
Air remaining at the
refrigerant system.
yes
NO
Recharge
refrigerant .
The refrigerant system
blocked. Please check
the Capillary Tube （or
electronic expansion
valve) for blockage?
yes
Heating mode
Test system
pressure. Is the pressure
normal at the high
pressure service port??
The pressure is low.
The system needs
refrigerant. Add refrigerant.
Is the pressure normal.
NO
Is the pressure close
to static pressure?
yes
4-way valve clogged or
compressor exhaust blocked.
NO
the vacuum
NO
yes
4-way valve clogged or
compressor exhaust blocked.
NO
Check check valve and 4-
way valve.
The pressure is high.
Recharge refrigerant
after air purging with
the vacuum
pump. Is the high
pressure normal?
yes
Air remaining at the
refrigerant system.
yes
Recharge refrigerant
Is the pressure is
close to static
pressure?
yes
NO
Remove the back
panel."see"the
capillary tube1 and
capillary tube2. Are
they defrosting?
yes
The capillary tube
blocked. Unsolder the
NO
capillary tube ASS'Y. Blow out
capillary tube1 and capillary
tube2 with compressed
.
nitrogen
Check heat exchanger and
4-way valve.