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93
AST 14 C 255/00
Boiler shut-down, picture
flashes:
CH system water
pressure is low
Low water inside heating
system
Fill up system
Leaks in the CH system
Check system
Boiler shut-down, picture
flashes:
Double flow probe fault
One of the two probes is
disconnected or in short-
circuit
Reconnect or replace
it
The difference between the
temperatures detected by
the double probe is higher
than 5°C
Replace the probe
Boiler shut-down, picture
flashes:
DHW probe is not
working
(only CTFS)
Disconnected or short-
circuited probe
Reconnect or replace
it
Boiler is not supplying
DHW
No triggering of DHW
flowmeter
System insufficient pressure
or flow rate
Check system
Check condition of
flowmeter filter
Flowmeter sensor is faulty or
disconnected
Connect or replace it
DHW probe does not
output enabling
Probe not correctly set
Replace the probe
Boiler shut-down, picture
flashes:
Automatic filling failed
(filing pressure not
reached within the valve
opening time)
Oversized heating system
Increase opening time
Too low system pressure
Reduce filling
threshold
Fouled filling solenoid valve
Clean it
Solenoid valve is not working
Check coil integrity
The boiler is working but
the image is flashing:
Too high system
pressure
System overload
Check pressure when
the system is not
heated
Expansion tank discharged
or faulty
Check pressure when
the system is empty
Undersized expansion tank
Add a supplementary
vessel
Boiler shut-down, picture
flashes:
Boiler probe fault
(only
for RTFS with water
heater)
Disconnected or short-
circuited probe
Reconnect or replace
it
Cold water inlet probe
fault
(CTFS)
