Friedrich FSHW091, Service And Parts Manual

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141 PB
Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting
Malfunction of the IDU fan motor The IDU fan motor can’t operate Refer to troubleshooting for H6 for mainte‑
nance method in details
Malfunction of the ODU fan motor The ODU fan motor can't operate Refer to point 4 of maintenance method for
details
Malfunction of compressor Compressor can't operate Refer to point 5 of maintenance method for
details
Horizontal Louver Will Not Swing
Wrong wire connection, or poor connection
Check the wiring status according to circuit
diagram Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly
Stepping motor is damaged Stepping motor can't operate Repair or replace stepping motor
Main board is damaged Others are all normal, while horizontal louver
can't operate Replace the main board with the same model
ODU Fan Moto Can’t Operate
Wrong wire connection, or poor connection
Check the wiring status according to circuit
diagram "Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly"
Capacity of the ODU fan motor is damaged "Measure the capacity of fan capacitor with
an universal meter and find that the capacity
is out of the deviation range indicated on the
nameplate of
fan capacitor." Replace the capacity of fan
"Power voltage is a little low or
high" "Use universal meter to measure the power
supply
voltage. The voltage is a little high or low" Suggest to equip with voltage regulator
Motor of outdoor unit is damaged "When unit is on, cooling/heating performance
is bad and ODU compressor generates a lot of
noise and heat." Change compressor oil and refrigerant. If no
better, replace the compressor with a new one
Compressor Can’t operate
Wrong wire connection, or poor connection
Check the wiring status according to circuit
diagram "Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly"
Capacity of compressor is damaged "Measure the capacity of fan capacitor with
an universal meter and find that the capacity
is out of the deviation range indicated on the
nameplate of
fan capacitor." Replace the compressor capacitor
"Power voltage is a little low or
high" "Use universal meter to measure the power
supply
voltage. The voltage is a little high or low" Suggest to equip with voltage regulator
Coil of compressor is burnt out "Use universal meter to measure the resis‑
tance
between compressor terminals and it's 0" Repair or replace compressor
TROUBLESHOOTING
Troubleshooting for Malfunction without Active Error Code