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Fault
Fault
code
12 DHW sensor fault
13 Fume sensor fault
14 Heating sensor 2 (Safety) fault
15 Fan fault
RESET button on controller on
26
gas valve, fault.
34 Supply voltage under 170V
35 Faulty mains frequency
37 Pressure switch contact open Low system pressure
39 External probe fault
No +/-1°C variation of flow
41
sensor
Protection for temperature
difference > 21° between flow
42
sensor and safety sensor
Cascade temperature sensor
50
fault
Protection for temperature
52
difference > 18° between flow
sensor and safety sensor
61 Controller fault
No communication between
62
controller and gas valve
63
64
Controller fault
65
66
No communication between
99
controller and display
240
Possible cause
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
No 230V power supply
Tachometric signal interrupted
Fan damaged
RESET button on controller fitted on gas valve blocked or faulty.
Electric mains trouble
Electric mains trouble
Probe damaged or wiring shorted
Probe disconnected after activating the sliding temperature
Flow sensor disconnected from pipe
Insufficient circulation in boiler
Incorrect flow sensor position
Sensor damaged
Wiring shorted
Wiring disconnected
Insufficient circulation in boiler
Controller internal error
Controller not connected
Valve damaged
Controller internal error
Wiring disconnected
cod. 3541Q764 - Rev. 00 - 05/2021
FORCE W
Cure
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the 3-pin connector wiring
Check the 5-pin connector wiring
Check the fan
Check the RESET button and replace the controller on the
gas valve if necessary.
Check the electrical system
Check the electrical system
Check the system water pressure
Check the wiring or replace the sensor
Reconnect the external probe or disable the sliding tempera-
ture
Check the correct positioning and operation of flow sensor
Check boiler/system water circulation
Check the integrity of sensor
Check the wiring or replace the sensor
Check boiler/system water circulation
Check the integrity of flow and safety sensor
Check the ground connection and replace the controller if
necessary.
Connect the controller to the gas valve
Replace the valve
Check the ground connection and replace the controller if
necessary
Check the wiring of the 6 wires between controller and display
EN
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