Boiler Safety - Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions

3.8. B S
OILER AFETY
S The boiler is protected from malfunctioning by means of internal checks by the P.C.B.,
YSTEMS
which brings the boiler to a stop if necessary.
In the event of the boiler being shut off in this manner, a code appears on the display
which refers to the type of shut-off and the reason behind it.
There are two types of shut-off:
- SAFETY SHUTDOWN: for this group of errors (characterised on the display by
the letter "E E ") the situation is automatically removed as soon as the cause behind
it is resolved.
As soon as the origin of the shutdown disappears, the boiler starts up again and
returns to its normal operation.
SHUTDOWN: (characterised on the display by the letter "A A "), is not removed
-
unless a manual intervention is made.
The boiler may return to operation only if reset by pressing the button "H" located
at the centre of the display.
There follows a list of the shutdown modes and the respective codes shown on the
display.
Shutdown ("A A " type): if such a situation occurs, it is necessary to reset the boiler using
the appropriate key. If this shutdown occurs again, your local Service Agent should be
contacted.
DISPLAY
A A 0 0 1 1 Too many attempts to ignite on starting up
A A 0 0 2 2 After three attempts at ignition, no increase in DT was detected
A A 0 0 3 3
The heating flow temperature exceeds 100°C during operation
A A 0 0 7 7 Too many failures to flame in one period during operation
A A 1 1 9 9 The flame was detected after the gas valve had closed
A A 2 2 0 0 The flame was detected before the gas valve opened
A A 2 2 1 1 The flow switch does not close
A A 2 2 2 2
The flow switch does not open
A A 3 3 3 3 Problem with the fan
A A 9 9 9 9 Problem with the electronic monitoring
N : When there is no ignition, check that the gas cock is open.
OTE
Safety shutdown: In the event that a safety shutdown occurs, it is necessary to contact an
Authorised Service Centre.
DISPLAY
E E 0 0 1 1 Insufficient water pressure
E E 5 5 6 6 Heating flow temperature probe in open circuit
E E 6 6 6 6 Heating flow temperature probe short-circuited
E E 0 0 4 4 Domestic hot water temperature probe in open circuit
E E 0 0 5 5
Domestic hot water temperature probe in short circuit
E E 0 0 8 8 Under floor heating temperature probe in open circuit
E E 2 2 0 0 Flame detected with gas valve closed
E E 2 2 1 1 Error in the electrical connection (live and neutral crossed)
E E 2 2 2 2 Problem with the 50Hz power supply
E E 2 2 3 3
Flame detection electrode short-circuited
E E 6 6 4 4 Heating return temperature probe in open circuit
E E 7 7 4 4 Heating return temperature probe in short circuit
E E 9 9 9 9 Problem within the electronic system
D T .
AILY EST
In order to prevent the shutdown of the components, the boiler carries out a self-
diagnosing test every 24 hours: the pump turns on for 3 seconds and the diverter valve
moves.
A - D
NTI FROST
The boiler is fitted with an anti-frost device consisting of three separate functions:
- Monitoring of the system flow temperature: if this temperature goes below 5°C, the
CAUSE
CAUSE
.
EVICE
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