EASY TECH D F
Fault
Fault
code
F11
DHW sensor fault
F14
Flow sensor 2 fault
A16
Gas valve fault
A23
Card parameter fault
A24
Card parameter fault
F34
Supply voltage under 180V.
F35
Faulty mains frequency
F37
Incorrect system water pressure
F39
External probe fault
Sensor positioning
A41
Flow temperature not increased
F42
Heating sensor fault
Exchanger protection interven-
F43
tion.
F50
Gas valve fault
EN
Possible cause
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
Wiring disconnected
Faulty gas valve
Wrong card parameter setting
Wrong card parameter setting
Electric mains trouble
Electric mains trouble
Pressure too low
Water pressure switch damaged or dis-
connected
probe damaged or wiring shorted
probe disconnected after activating the
sliding temperature
Flow sensor or DHW sensor detached
from the pipe
No complete burner ignition
Sensor damaged
No system H
O circulation
2
Air in the system
Modulating Operator wiring discon-
nected
Faulty gas valve
cod. 3542B960 - Rev. 01 - 04/2023
Cure
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring
Check the gas valve and replace it if neces-
sary
Check the card parameter and modify it if
necessary
Check the card parameter and modify it if
necessary
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the wiring or replace the sensor
Reconnect the external probe or disable the
sliding temperature
Check the correct positioning and operation
of the sensors
Increase parameter P1 up to a maximum of
19
Replace the sensor
Check the circulating pump
Vent the system
Check the wiring
Check the gas valve and replace it if neces-
sary
65