Opening The Casing - Ferroli DIVAtop MICRO LN 24 C Instrucciones De Uso, Instalación Y Mantenimiento

4.3 Maintenance
Periodical check
To ensure proper operation of the unit over time, have qualified personnel carry out a
yearly check, providing for the following:
• The control and safety devices (gas valve, flowmeter, thermostats, etc.) must func-
tion correctly.
• The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. - The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
• The air/fume terminal and ducts must be free of obstructions and leaks
• The burner and exchanger must be clean and free of deposits. For cleaning do not
use chemical products or wire brushes.
• The electrode must be free of scale and properly positioned.
• The gas and water systems must be tight.
• The water pressure in the cold water system must be approx. 1 bar; otherwise bring
it to that value.
• The circulating pump must not be blocked.
• The expansion tank must be filled.
• The gas flowrate and pressure must match that given in the respective tables.
The boiler casing, control panel and aesthetic parts can be cleaned with a soft
A
damp cloth, if necessary soaked in soapy water. Do not use any abrasive de-
tergents and solvents.

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.
36
EN
Table of faults
Table. 2
Code
fault
A01
A02
toA03
F04
A06
F10
F11
3
F14
F34
F35
F37
2
F39
F40
A41
F42
F43
F47
F50
cod. 3540S351 - Rev. 01 - 02/2015
DIVAtop MICRO LN C
Fault Possible cause
No gas
No burner ignition
Ignition/detection electrode fault
Defective gas valve
Ignition power too low
Electrode fault
Flame present signal
with burner off
Card trouble
Heating sensor damaged
Over-temperature pro-
tection trips No water circulation in the system
Air in the system
Fume thermostat acti- Fume thermostat contact open
vated (after activation
Wiring disconnected
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-
tion phase
Burner minimum pressure setting
Sensor damaged
Delivery 1 sensor fault Wiring shorted
Wiring disconnected
Sensor damaged
Tap water sensor fault Wiring shorted
Wiring disconnected
Sensor damaged
Delivery 2 sensor fault Wiring shorted
Wiring disconnected
Supply voltage under
Electric mains trouble
170V.
Irregular mains fre-
Electric mains trouble
quency
Pressure too low
Incorrect system water
pressure
Sensor damaged
Probe damaged or wiring shorted
External sensor fault
Sensor disconnected after activat-
ing the sliding temperature
Incorrect system water
Pressure too high
pressure
Sensor positioning Delivery sensor detached from pipe
Heating sensor fault Sensor damaged
No system H O circulation
Exchanger protection
2
trips.
Air in the system
System water pres-
Wiring disconnected
sure sensor fault
Modureg fault Wiring disconnected
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
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
Check the circulator
Vent the system
Check the wiring
Check the wiring