Fer FALCON II Installation, Servicing & User Instructions page 35

Check cold water
inlet pressure
Check cold water
Check if water
inlet pressure
filter is clean
Check if water
filter is clean
Go to
chart 4
Go to
chart 4
DHW taps closed
Put CH temperature selector
to maximum
DHW taps closed
Ensure external controls
are calling for heat
Put CH temperature selector
to maximum
Is LED4 flashing?
YES
Ensure external controls
are calling for heat
Wait 2 minutes
Is LED4 flashing?
Is LED4 flashing?
YES
YES
Check and if is necessary
Wait 2 minutes
replace main board
Is LED4 flashing?
YES
Open DHW taps
Check Domestic Hot Water operation
Open DHW taps
DHW flow rate at
NO
least 2,5 litre/min?
DHW flow rate at
NO
least 2,5 litre/min?
Is LED3 on?
YES
Is LED3 on?
Is LED4 flashing?
YES
Is LED4 flashing?
Is relay RY100 switch on?
YES
NO
Check and if necessary
Is relay RY100 switch on?
YES
replace limit thermostat
NO
Check and if necessary
replace limit thermostat
Check Central Heating operation
Does C.H. pump run?
NO
NO
NO
NO
FALCON II
Chart 2
YES
NO
YES
NO
YES
NO
Check and if necessary
replace main board
YES
NO
Check and if necessary
replace main board
Chart 3
Does C.H. pump run?
YES
Go to chart 4
YES
Is relay RY100
switch on
Go to chart 4
YES
Go to chart 4
Is relay RY100
switch on
YES
Go to chart 4
Check and if necessary
replace DHW Sensor
Check and if necessary
Check and if necessary
replace DHW Sensor
replace Flow Sensor
Check and if necessary
replace Flow Sensor
Is relay RY101
NO
switch on
NO
Check and if
necessary replace
Is relay RY101
main board
NO
switch on
NO
NO
Check and if
necessary replace
main board
Check
limit thermostat
NO
Check
limit thermostat
YES
Check pump
wiring
connection
YES
Check and if
necessary
replace pump
Check pump
wiring
connection
Check and if
necessary
replace pump
35