Friedrich FSHW091, Service And Parts Manual

Page: 139 / 171

139 PB
TROUBLESHOOTING
High-pressure Protection
High-pressure Protection
High-pressure protection
Use pressure gauge to
measure if the pressure is
really high?
Check if the operation mode of
indoor unit is set properly?
Check if the gas valve and
liquid valve are fully open?
Check if the front panel of
outdoor unit is covered tightly?
Check if the air inlet and outlet of
the indoor and outdoor
exchanger is smooth ?
Check if the indoor and
outdoor fans operate normally?
Check if the indoor swing
louver is fully open?
Check if the capacity output of
outdoor unit is equal to the
capacity demand of indoor units?
Clean the fins
The system pipe is blocked
Check if the indoor / outdoor
filters or radiating fins are dirty or
blocked ?
Refer to the dial-up of indoor
and outdoor unit
Measure the swing motor and
signal input
Measure the fan motor and
signal input
Remove the obstructions
Cover up the front panel
properly
Fully open the valve
Set the correct operation
mode
Measure if the pressure switch
is normal
Replace the pressure switch
no
no
no
no
no
no
no
no
no yes
yes
yes
yes
yes
yes
yes
yes
yes
no
no
Replace the mainboard of
outdoor unit
Replace the blocked parts or
pipe