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FORCE B
164
EN
cod. 3541T170 - Rev. 00 - 09/2019
F14
Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F15
Fan fault
No 230V power supply
Check the 3-pin connector wiring
Tachometric signal interrupted
Check the 5-pin connector wiring
Fan damaged
Check the fan
F26
RESET button on con-
troller on gas valve,
fault.
RESET button on controller on gas valve, blocked
or faulty.
Check the RESET button and replace the con-
troller on the gas valve if necessary.
F34
Supply voltage under
170V
Electric mains trouble
Check the electrical system
F35
Faulty mains frequency Electric mains trouble
Check the electrical system
F37
Pressure switch con-
tact open
Low system pressure
Check the system water pressure
F39
External probe fault
Probe damaged or wiring shorted
Check the wiring or replace the sensor
Probe disconnected after activating the sliding tem-
perature
Reconnect the external probe or disable the sli-
ding temperature
A41
Sensor positioning
Delivery sensor disconnected from the pipe
Check the correct positioning and operation of
the heating sensor
A42
Heating sensor fault
Sensor damaged
Replace the sensor
F50
Cascade temperature
sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F52
Heating sensor fault
Sensor damaged
Replace the sensor
A61
Controller fault
Controller internal error
Check the ground connection and replace the
controller if necessary.
A62
No communication bet-
ween controller and gas
valve
Controller not connected
Connect the controller to the gas valve
Valve damaged
Replace the valve
A63
A64
A65
F66
Controller fault
Controller internal error
Check the ground connection and replace the
controller if necessary
F99
No communication bet-
ween controller and dis-
play
Wiring disconnected
Check the wiring of the 6 wires between contro-
ller and display
Fault
code
Fault
Possible cause
Cure