Troubleshooting; Ignition Cycle - Immergas EOLO Mini Manual

Technical Documentation

Troubleshooting.

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.

Ignition cycle

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
Yes
LED n°5 flashes
LEDs n°1-7 flash
HEATING PHASE
Main selector switch in winter position.
Turn the heating selector switch to maximum and interrupt any domestic
hot water requests.
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,
The pump starts.
CRD, programming clock, etc...
N.B.: LED n°3 must
No
light-up at the same Check the effective request from any external
time corresponding devices (TA, CAR, CRD, programming
clock).
t o t h e " h e a t i n g
request". Se e a l s o " O f f - l i n e re m o t e c o n t r o l
anomaly".
See section B
No
Yes
The 3-way valve
goes to the heating See section C
No
position.
The fan starts-up.
Yes
LED n°8 flashes.
No
The ignition electrodes perform the
discharge.
Yes
The burner ignites.
Yes
STEMkW Special ed 01/08
No See section A
Yes See "NTC flow probe anomaly"
Yes See" parasite flame block"
No LED n°8 flashes
No LED n°7 flashes
Yes See "flue pressure switch anomaly" - b
LED n°6 flashes
No
(wait for the board to perform 2 ignition cycles).
LED n°6 flashes
No
(wait for the board to perform 2 ignition cycles).
LEDs n° 2-7 flash
No
(wait for the board to perform several ignition attempts)
Technical Documentation
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 off and
remove the voltage from the appliance for at least 5 seconds.
This is to allow the boiler to start a new ignition cycle.
No
DOMESTIC HOT WATER PHASE
Main selector switch in summer position.
Turn the DHW selector switch to maximum and open the cock.
LED n°2
c o r re s p o n d i n g t o See section F
No
"DHW request" on.
Yes
The circulation pump
See section B
starts. No
Yes
The 3-way valve goes
to domestic hot water See section C
No
position.
Yes
38
See "flue pressure switch anomaly"
- a
See "no overheating safety thermostat"
- a
See "no ignition block" - a
See "no ignition block" - b
See "electro-mechanical contacts
block"
EOLO Mini kW Special