Ariston Clas 24 FF Installation And Servicing Instructions page 74

user' manual
Appliance shut-off conditions
The boiler is protected from malfunctions by means of internal
checks performed by the electronic P.C.B., which stops the boiler
from operating if necessary. In the event of the boiler being shut off
in this manner, a code appears on the control panel display which
refers to the type of shut-off and the reason behind it.
Two types of shut-off may occur:
Safety shut-off
This type of error is "volatile", which means
that the boiler starts up again automatically
as soon as the problem which caused the
shut-off is removed. The display will fl ash
"Err" and the error code.
In fact, as soon as the cause of the shut-off disappears, the boiler
starts up again and continues to operate normally.
While the boiler is shut off for safety reasons, it is possible to attempt
to restore normal operation by switching the appliance off and on
again using the ON/OFF button on the control panel.
If the boiler still indicates a safety shut-off , switch it off . Make sure
the external electric switch is in the OFF position, close the gas tap
and contact a qualifi ed technician.
Safety shut-off due to insuffi cient water pressure
If the water pressure inside the heating circuit is insuffi cient, the
boiler will perform a safety shut-off . (See table).
To re-pressurise the boiler, it will be necessary to connect
the silver fl exible hose supplied to the two isolating points
underneath the boiler, once the hose is connected, open up both
of the black quarter turn handles, once the pressure reads 1.5 bar
on the display, close both handles and disconnect the hose .
If the pressure drops very frequently, there may be a water leak
at some point in the system. If this is the case please contact your
installer and ask them to check it.
Operation shutdown
This type of error is "non volatile", which means that it is not
removed automatically. The display will fl ash Err and the error
code and the red led lights up "3"
In this case the boiler does not restart automatically, but it may
be reset by pressing the
itself again after several attempts to reset the appliance, contact a
qualifi ed technician.
IMPORTANT
IF THIS SHUTDOWN OCCURS FREQUENTLY, CONTACT AN
AUTHORISED SERVICE CENTRE FOR ASSISTANCE. FOR SAFETY
REASONS, THE BOILER WILL ALLOW A MAXIMUM OF 5 RESET
OPERATIONS TO TAKE PLACE IN 15 MINUTES (INDIVIDUAL
PRESSES OF THE BUTTON).
6
.
button. If the problem manifests
Operation shutdown error table
Display Description
1 01 Overheating
5 01 No fl ame detection
1 03
1 04
1 05
Insuffi cient circulation
1 06
1 07
3 05 P.C.B error
3 06 P.C.B error
3 07 P.C.B error
Anti-frost Device.
The anti-frost function acts on the central heating fl ow temperature probe,
independently from other settings, when the electrical supply is turned
on.
If the primary circuit temperature falls below 8°C the pump will run for 2
minutes.
After the two minutes of circulation (fi xed) the boiler will check the fol-
lowing:
a) if the central heating fl ow temperature is > 8°C, the pump stops;
b) if the central heating fl ow temperature is between 4 and 8°C, the pump
will run for another two minutes;
c) if the central heating fl ow temperature is < 4°C, the burner will fi re
(heating position) at minimum power until the temperature reaches
33°C, the burner will go off and the pump will continue to run for two
minutes.
The anti-frost device activates only when (with the boiler operating cor-
rectly):
- the system pressure is correct,
- the boiler is electrically powered,
- there is a supply of gas.