Mynute Boiler
23
3A SWITCHING OFF
Temporary switching off
In case of absence for short periods of time, set the mode selector
(3 - fig. 1a) to (OFF).
In this way (leaving the electricity and fuel supplies enabled), the
boiler is protected by the following systems:
-
Anti-frost device:
when the temperature of the water in the boil-
er falls below 5°C, the circulator and, if necessary, the burner are
activated at minimum output levels to bring the water tempera-
ture back to the values for safety (35°C). During the anti-frost
cycle, the symbol
appears on the digital monitor.
-
Circulator anti-blocking function:
an operation cycle is acti
-
vated every 24 hours.
Long period switching off
In case of absence for long periods of time, set the mode selec-
tor (3 - fig. 1a) to (OFF). Then, close the gas tap present on
the system. In this case, anti-frost device is deactivated: empty the
systems, in case of risk of frost.
4A CONTROLS
At the beginning of the heating season, and occasionally during
use, make sure the hydrometer-thermohydrometer indicates cold
system pressure values between 0.6 and 1.5 bar: this avoids sys
-
tem noise levels due to the presence of air. In case of insufficient
water circulation, the boiler will switch off. Under no circumstances,
water pressure must be below 0.5 bar (red field).
If this condition is checked, it is necessary to restore water pres
-
sure in the boiler proceeding as follows:
- set the mode selector (3 - fig.1a) to (OFF)
- turn on the filling tap (B fig. 15) until the pressure value is be
-
tween 1 and 1.5 bar.
Carefully close the tap. Replace the mode selector on the initial
position. If pressure drop is frequent, contact the Technical Assis-
tance Service.
5A LIGHT SIGNALS AND FAULTS
The operating status of the boiler is shown on the digital display,
below is a list of the types of displays.
BOILER STATUS
DISPLAY
Stand-by
-
OFF status
OFF
ACF module lockout alarm
A01
ACF electrical fault alarm
A01
Limit thermostat alarm
A02
Air pressure switch alarm (B.S.I. models)
Fumes thermostat
(B.A.I. models)
A03
H2O pressure switch alarm
A04
NTC water tank fault
A06
NTC heating fault
A07
Parasite flame
A11
Electric calibration min and max heating
ADJ
Transient awaiting ignition
88°C
flashing
Air pressure switch intervention (B.S.I. models)
flashing
H2O pressure switch intervention
flashing
External probe present
Domestic water heat request
60°C
Heating heat request
80°C
Anti-freeze heat request
Flame present
To restore operation (deactivate alarms):
Faults A 01-02-03
Position the function selector to
(OFF), wait 5-6 seconds then
set it to the required position
(summer mode) or
(winter
mode). If the reset attempts do not reactivate the boiler, contact the
Technical Assistance Centre.
Fault A 04
In addition to the fault code, the digital display shows the symbol
.
Check the pressure value indicated by the water gauge:
if it is less than 0.3 bar, position the function selector to
(OFF)
and adjust the filling tap (B fig. 15)
until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position (sum-
mer) or
(winter).
If pressure drops are frequent, request the intervention of the Tech-
nical Assistance Service.
Fault A 06
The boiler operates normally but cannot reliably maintain a con
-
stant domestic hot water temperature, which remains set at around
50°C. Contact the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
