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STEMkW Special ed 01/08 EOLO Mini kW Special
Technical DocumentationTechnical Documentation
Apply voltage to the boiler and turn the main selector switch to "summer" or "winter".
A LED from n°4 to n°8 lights up
No
See section A
Yes
LED n°5 ashes
Yes
See "NTC ow probe anomaly"
LEDs n°1-7 ash
Yes
See" parasite ame block"
No
Before every intervention:
Check that gas, water and electricity have been correctly
connected to the boiler, according to that indicated in the plate
data and in the instruction manual.
Also ensure that:
- the gas valve and the boiler parameters have been correctly
adjusted;
- any devices outside of the boiler function and are appropriately
adjusted;
- internal and external fuses are integral.
Before a maintenance intervention or replacement of
components, remove the electric power supply upstream from
the components.
For correct use of the troubleshooting table, on intervention
it is recommended to reset any errors, with the boiler o and
remove the voltage from the appliance for at least 5 seconds.
is is to allow the boiler to start a new ignition cycle.
Ignition cycle
HEATING PHASE
Main selector switch in winter position.
Turn the heating selector switch to maximum and interrupt any domestic
hot water requests.
e pump starts.
N.B.: LED n°3 must
light-up at the same
time corresponding
to the "heating
request".
No
Check the presence of the TA jumper on clamps
40-41 of the P.C.B.
N.B.: the jumper must not be present when
external devices are installed such as TA, CAR,
CRD, programming clock, etc...
Check the eective request from any external
devices (TA, CAR, CRD, programming
clock).
See als o "Of f- line re mo te control
anomaly".
No
See section B
Yes
The 3-way valve
goes to the heating
position.
No
See section C
DOMESTIC HOT WATER PHASE
Main selector switch in summer position.
Turn the DHW selector switch to maximum and open the cock.
LED n°2
co rresp on din g to
"DHW request" on.
No
See section F
Yes
e circulation pump
starts.
No
See section B
Yes
e 3-way valve goes
to domestic hot water
position.
No
See section C
Yes
e fan starts-up.
No
LED n°8 ashes
See "ue pressure switch anomaly"
- a
No
LED n°7 ashes
See "no overheating safety thermostat"
- a
Yes
LED n°8 ashes.
Yes
See "ue pressure switch anomaly" - b
No
e ignition electrodes perform the
discharge.
No
LED n°6 ashes
(wait for the board to perform 2 ignition cycles).
See "no ignition block" - a
Yes
e burner ignites.
No
LED n°6 ashes
(wait for the board to perform 2 ignition cycles).
See "no ignition block" - b
No
LEDs n° 2-7 ash
(wait for the board to perform several ignition attempts)
See "electro-mechanical contacts
block"
Yes
Troubleshooting.
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