Troubleshooting - Fer MIKRO P7 Instrucciones De Uso

Burner lighting
• Switch on the power, operating the main switch ahead of the burner.
• To fill the auger with pellets, see sec. 3.4.
• close the thermostat line (boiler/room).
Burner setting
1. Connect a combustion analyser to the boiler outlet and leave the burner working at
max. for 30 minutes; meanwhile, check the efficiency of the flue pipe.
2. MAKE SURE THE COMBUSTION CHAMBER IS IN NEGATIVE PRESSURE
3. Check the combustion at max. burner power (adjusted according to boiler nominal
power).
4. Combustion parameters:
• O between 5% and 9%
2
• CO between 150 and 1000 ppm
To set the burner, change the fan set point by modifying the relevant parameter (see
the section "Service parameters menu" and and table 2 in cap. 2.4).
The CO value depends on the quality of pellets, the amount of dirt in the combustion
head and boiler draught.
To operate the burner in MODULATING mode, it is necessary to modify the param-
eter "T18" and then carry out points 5 and 6 described below.
5. Check the other burner steps, reducing the value of parameter u02 to 1 (see the sec-
tion "Service parameters menu" and table 1 in cap. 2.4).
6. Set the parameter u02 to the correct value.
4.3 Maintenance
Checks and controls
Periodically check the cleanness of the burner parts which will tend to get dirty
A
depending on the quality of the pellets or due to incorrect burner adjustment.
Periodically check the pellet hopper and remove dust from the bottom. An ex-
A
cessive amount of dust can affect the proper supply of fuel to the burner.
The burner requires periodical maintenance which must be performed by qualified per-
sonnel at least once a year.
The basic operations to carry out are:
• check and cleaning of the internal parts of the burner and boiler as indicated in the
following sections;
• complete combustion analysis (after at least 10 minutes' operation) and check of
correct settings;
Opening the casing and removing the burner
B
Before carrying out any checking or cleaning inside the burner, disconnect the
power to the burner by means of the main system switch.
To open
Undo the screws (A) and remove the casing (B). The internal components, motor, shut-
ter, etc., can be directly accessed.
To disassemble
Undo the screws (A) and remove the casing (B), undo the nut (C) and disconnect the
body, undo the fixing screws (D) and remove the nozzle (E).
22
EN
E
D
C
B
fig. 10
cod. 3540T988 - Rev. 01 - 01/2014
Checks on parts and components
Fan
Make sure no dust has accumulated inside the fan and on the blades: it reduces the air
flow, thus causing pollutant combustion.
Combustion head
Make sure all parts of the combustion head are intact, not warped by the high tempera-
ture, free of impurities coming from the room, and correctly positioned.
Photoresistance
Remove any dust on the glass. The photoresistance is press-on; to remove, pull it out-
wards.

4.4 Troubleshooting

The burner is equipped with an advanced self-diagnosis system. In case of a burner
anomaly, the display (Detail 7 - fig. 1) flashes indicating the fault code.
There are faults that cause permanent shutdowns (marked with the letter "A"): to restore
operation press the button "P" (Detail 5 - fig. 1) for 1 second; if the burner fails to start,
it is necessary to firstly eliminate the fault.
Other faults cause temporary shutdowns (marked with the letter "F") which are automat-
ically reset as soon as the value returns within the burner's normal working range.
Table. 3 - List of faults
Code Fault
A01 No ignition shutdown
Parasite flame elimination
F02
A02 Shutdown for parasite flame
A04 Auger safety thermostat block
F05 Faulty pipe pressure adjustment
Pressure transducer fault
F06
(disconnected)
Boiler shell probe fault
F10
(if enabled)
A03 Wiring fault
A
MIKRO P7 - P12
Cause Cure
Pellet container empty Fill the container with pellets
Auger cable broken or disconnected Restore the connection
Replace and empty the head
Faulty igniter resistance
of pellets
Combustion head dirty Empty and clean it
Free it, make sure the combustion
Pellet feed duct obstructed head is not clogged and empty it if
necessary
The demand for heat has ended,
Wait for end of post-ventilation
but the burner detects flame
Photoresistance short circuit Replace the photoresistance
Extraneous light strikes the
Eliminate light source
photoresistance
Check the transparent parameters
Incorrect ignition parameters
03=51 and 04=12
Clean it and check correct minimum
Boiler under pressure
flue draught (10Pa)
Faulty safety thermostat Replace it
Pressure sensor connection tube
Replace
squashed
Fan motor damaged Replace
Fan dirty Clean it
Check the wiring or replace
Wiring disconnected
the sensor
Sensor damaged
Check the wiring or replace
Wiring shorted
the sensor
Wiring disconnected
Jumper of terminals 13-14
Check the wiring
not connected