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Opening the casing
To open the boiler casing:
1.
Undo the screws A (see fig. 22).
2.
Turn the casing (see fig. 22).
3.
Lift the casing.
B
Before carrying out any operation inside the boiler, disconnect the power supply
and close the gas cock upstream
A
1
A
fig. 22 - Opening the casing
Combustion analysis
1.
Insert the probe into the flue;
2.
Check that the relief valve is connected to a drain funnel;
3.
Activate TEST mode;
4.
Wait 10 minutes for the boiler to stabilize;
5.
Take the measurement.
4.4 Troubleshooting
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault,
the display will flash together with the fault symbol (detail 22 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation just press the RESET button (detail 8 - fig. 1) for 1 second or RESET on the
optional remote timer control if installed; if the boiler fails to start, it is necessary to first
eliminate the fault.
Other faults (marked with the letter "F") cause temporary shutdowns that are automati-
cally reset as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 2
Code
Fault
Possible cause
fault
No gas
A01
No burner ignition
Ignition/detection electrode fault
Defective gas valve
Ignition power too low
Electrode fault
Flame present signal
A02
with burner off
Card trouble
Heating sensor damaged
Over-temperature pro-
toA03
tection trips
No water circulation in the system
Air in the system
Fume thermostat acti-
Fume thermostat contact open
vated (after activation
Wiring disconnected
F04
of the fume thermostat,
Flue not correctly sized or
boiler operation is pre-
obstructed
vented for 20 minutes)
Low pressure in the gas system
No flame after the igni-
A06
tion phase
Burner minimum pressure setting
Sensor damaged
F10
Delivery 1 sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
F11
Tap water sensor fault
Wiring shorted
Wiring disconnected
34
EN
Code
3
2
Recommended cure
Check the regular gas flow to the
boiler and that the air has been
eliminated from the pipes
Check the wiring of the electrode
and that it is correctly positioned
and free of any deposits
Check and change the gas valve
Adjust the ignition power
Check the ionisation electrode wir-
ing
Check the card
Check the correct positioning and
operation of the heating sensor
Check the circulator
Vent the system
Check the thermostat
Check the wiring
Change the flue
Check the gas pressure
Check the pressures
Check the wiring or replace the sen-
sor
Check the wiring or replace the sen-
sor
cod. 3540S270 - 02/2010 (Rev. 00)
DIVAtop MICRO C
Fault
Possible cause
fault
Sensor damaged
F14
Delivery 2 sensor fault
Wiring shorted
Wiring disconnected
Supply voltage under
F34
Electric mains trouble
170V.
Irregular mains fre-
F35
Electric mains trouble
quency
Pressure too low
Incorrect system water
F37
pressure
Sensor damaged
Probe damaged or wiring shorted
F39
External sensor fault
Sensor disconnected after activat-
ing the sliding temperature
Incorrect system water
F40
Pressure too high
pressure
A41
Sensor positioning
Delivery sensor detached from pipe
F42
Heating sensor fault
Sensor damaged
No system H
Exchanger protection
F43
trips.
Air in the system
System water pres-
F47
Wiring disconnected
sure sensor fault
F50
Modureg fault
Wiring disconnected
Recommended cure
Check the wiring or replace the sen-
sor
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the wiring or change the
sensor
Reconnect the external sensor or
disable the sliding temperature
Check the system
Check the safety valve
Check the expansion tank
Check the correct positioning and
operation of the heating sensor
Change the sensor
O circulation
Check the circulator
2
Vent the system
Check the wiring
Check the wiring
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