Immergas EOLO STAR 24 5E, Instruction Manual

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3.3 TROUBLESHOOTING

NOTE: 

maintenance operations must be carried 

out by an authorised company (e.g. After-Sales 

Technical Assistance Service).
-  Smell of gas. Caused by leakage from gas circuit 

pipelines. Check sealing efficiency of gas intake 

circuit.

- The fan works but ignition discharge does not 

occur on the burner ramp. The fan may start but 

the safety air pressure switch does not switch 

the contact over. Make sure:

1)  the intake-exhaust duct is not too long (over 

allowed length).

2)  the intake-exhaust pipe is not partially blo-

cked (on the exhaust or intake side).

3)  the diaphragm of the fume exhaust is adequa-

te for the length of the intake-exhaust duct.

4)  the sealed chamber is kept in good condi-

tions.

5)  the fan power supply voltage is not less than 

196 V.

- Irregular combustion (red or yellow flame). 

Can be caused by: dirty burner, clogged lamel-

lar pack, intake - exhaust terminal not installed 

properly. Clean the above components and 

ensure correct installation of the terminal.

- Frequent activation of the temperature over-

load thermostat. It can depend on reduced 

water pressure in the boiler, little circulation 

in the heating system, the blocked pump or 

an anomaly of the boiler P.C.B. Check on the 

pressure gauge that the system pressure is 

within established limits. Check that radiator 

valves are not all closed.

-  Presence of air in the system. Check opening of 

the special air vent valve cap (Fig. 1-28). Make 

sure the system pressure and expansion vessel 

factory-set pressure values are within the set 

limits; the factory-set value for the expansion 

vessel must be 1.0 bar, and system pressure 

between 1 and 1.2 bar.

- Ignition block. (Par. 2.4).
- Low water flow: if, as a result of limescale 

(calcium and magnesium), the domestic hot 

water system does not work properly, contact 

a qualified technician for descaling e.g. After-

Sales Technical Service. Descaling must be 

carried out on the domestic hot water side of 

the bithermal heat exchanger in accordance 

with good practice. To preserve integrity and 

efficiency of the heat exchanger, a non corro-

sive descaler must be used. Cleaning must be 

carried out without the use of tools which can 

damage the heat exchanger.

3.4  CONVERTING THE BOILER TO 

OTHER TYPES OF GAS.

If the boiler has to be converted to a different 

gas type to that specified on the data nameplate, 

request the relative conversion kit for quick and 

easy conversion.

The gas conversion operation must be carried 

out by an authorised company (e.g. After-Sales 

Technical Assistance).

To convert to another type of gas the following 

operations are required:

- remove the voltage from the appliance;
-  replace the main burner injectors, making sure 

to insert the special seal rings supplied in the 

kit, between the gas manifold and the injectors;

- apply voltage to the appliance;
- select, using the boiler key, the gas parameter 

type (P01) and select (

nG

) in the case of me-

thane supply or (

LG

) in the case of LPG supply 

and save it;

-  Carry out complete calibration of the gas valve:

• adjust the boiler nominal heat output;
• adjust the boiler nominal heat output in 

domestic hot water phase;

-  adjust the boiler nominal heat output in heating 

phase (para. 3.7 parameter “P5”);

- adjust (eventually) the maximum heating 

power (para. 3.7 parameter “P6”);

-  after completing conversion, apply the sticker, 

present in the conversion kit, near the data-

plate. Using an indelible marker pen, delete 

the data relative to the old type of gas.

These adjustments must be made with reference 

to the type of gas used, following that given in 

the table (Par. 3.15).

3.5  CHECKS FOLLOWING 

CONVERSION TO ANOTHER TYPE 

OF GAS.

After making sure that conversion was carried 

out with a nozzle of suitable diameter for the 

type of gas used and the settings are made at the 

correct pressure, check that:

- there is no flame in the combustion chamber
-  the burner flame is not too high or low and that 

it is stable (does not detach from burner);

- the pressure testers used for calibration are 

perfectly closed and there are no leaks from 

the gas circuit.

NOTE:

 all boiler adjustment operations must be 

carried out by an authorised company (e.g. After-

Sales Technical Assistance). Burner adjustment 

must be carried out using a differential "U" or 

digital type pressure gauge connected to the 

pressure socket located above the sealed cham-

ber (part. 9 Fig. 1-28) and the gas valve pressure 

outlet (part. 1 Fig. 3-3), keeping to the pressure 

value given in the table (Par. 3.15) according to 

the type of gas for which the boiler is prepared.

3.6  GAS VALVE CALIBRATION.

The valve calibration must be carried out when 

the gas valve or the P.C.B. is replaced or in the 

case of conversion to a different type of gas.
To access the calibration phase, proceed as de-

scribed below (references Fig. 2-1):

Attention:

 it is not possible to carry out the 

complete calibration or the correction of the gas 

valve calibration in case of anti-freeze function 

enabled.

Attention:

 ensure a sufficient DHW flow, in 

order to avoid high temperatures of the water.

Complete calibration.

Access the valve calibration function.

Note:

 there must be no D.H.W. demand to access 

the gas valve calibration function.
Set parameter P15 to 5 and exit from the menu.
• Adjustment of boiler nominal thermal heat 

output.

- Press buttons (2) and (5) simultaneously for 5 

seconds until "Au" + "to" appears alternately on 

the display.

Note:

 press buttons (2) and (5) again for 5 

seconds or wait 2 minutes without implemen-

ting any adjustment to exit from the complete 

calibration phase.

- Wait until the parameter b02 appears 

(adjustment of the boiler nominal heat output).

Note:

 the boiler starts up in heating mode; if 

you wish to adjust the D.H.W., open a hot water 

tap after the burner goes on.

-  Adjust parameter b02, observing the maximum 

pressure values stated in the tables (Para. 3.15) 

depending on the type of gas.

- Press the button (5) to increase the thermal 

power and button (6) to decrease it. After the 

adjustment, press and hold the reset button 

(1) to save the parameter. Confirmation that 

the parameter has been saved is given by the 

value flashing.

SGV 100 B&P GAS valve

Key:

  1  -  Gas valve outlet pressure 

point

  2 -  Coil

  3  -  Wiring connector

  4  -  Gas valve inlet pressure 

point

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