Immergas MINI EOLO 28 3E, Instruction And Warning Booklet

20

INS

TALLER

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 MAINTEN

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2.4  USING THE BOILER.

Before ignition, make sure the heating system 

is filled with water and that the manometer (7) 

indicates a pressure of 1 ÷ 1.2 bar.

- Open the gas cock upstream from the boiler.
- Press the button (2) until the display switches 

on, after which press the button in sequence 

(2) and take the boiler to the summer (

) 

or winter (

) position.

• 

Summer 

(

)

:

 in this mode the boiler func-

tions only to heat the DHW, the temperature 

is set via the buttons (3-4) and the relative 

temperature is shown on the display via the 

indicator (16).

• Winter 

(

)

:

 in this mode the boiler func-

tions both for heating domestic hot water and 

heating the environment. The temperature of 

the DHW is always regulated via buttons (3-4), 

the heating temperature is regulated via buttons 

(5-6) and the relative temperature is shown on 

the display via the indicator (16).

From this moment the boiler functions auto-

matically. With no demand for heat (heating or 

domestic hot water production) the boiler goes to 

“standby” function, equivalent to the boiler being 

powered without presence of flame. Each time 

the burner ignites, the relative flame present sym-

bol is displayed (10) with relative power scale.
• 

Operation with Comando Amico Remoto

V2 

remote control (CAR

V2

) (Optional).

 If the 

CAR

V2

 is connected, the (

) symbol will 

appear on the display. The boiler regulation pa-

rameters can be set via the CAR

V2

 control panel 

and the reset button (1) remains active on the 

boiler control panel, along with the switch-off 

button (2) (“off” mode only) and the display 

where the functioning state is shown.

Important:

 if the boiler is put into “off” mode 

on the CAR

V2

 the “CON” connection error 

symbol will appear on the CAR

V2

. The CAR

V2

 is 

however powered constantly so as not to loose 

memorised programs.

• 

Functioning with optional external probe 

(

)

.

 In the case of a system with optional 

external probe, the boiler flow temperature for 

room central heating is managed by the exter-

nal probe depending on the external tempera-

ture measured (Par. 1.6). The flow temperature 

can be modified by selecting the functioning 

curve via buttons (5 and 6), selecting a value 

from “0 to 9” (Fig. 1-7).

  With external probe present, the relative 

symbol will appear on the display (12). In the 

central heating phase, if the temperature of the 

water contained in the plant is sufficient to heat 

the radiators, the boiler can only function with 

the activation of the boiler pump.

• 

“Stand-by” mode.

 Press button (2) in suc-

cession until the (

) symbol appears. The 

boiler remains active from this moment and the 

anti-freeze function, pump anti-block function 

and 3-way and signalling of any anomalies is 

guaranteed.

N.B.:

 in these conditions the boiler is consid-

ered still live.

• 

“Off” mode.

 By holding the button (2) down 

for 8 seconds, the display switches-off and the 

boiler is off completely. The safety functions are 

not guaranteed in this mode.

N.B.:

 in these conditions the boiler is considered 

still live even if there are no functions active.

• 

Display functioning.

 The display lights up 

during the use of the control panel, after 15 

seconds inactivity, the brightness drops until 

just the active symbols are displayed. The light-

ing mode can be varied via parameter P2 in the 

circuit board customisation menu.

2.5 TROUBLESHOOTING.

The boiler signals out anomalies by flashing on 

the display and relative error codes, listed on the 

table, are displayed.

Anomaly signalled

code  

displayed  

(flashing)

No ignition block

01

Safety thermostat block 

(over-temperature), flame 

control anomaly

02

Fan anomaly

03

General boiler board anomaly

04

Flow probe anomaly

05

Domestic hot water probe 

anomaly

06

Maximum N° of reset

08

Insufficient system pressure

10

Flue pressure switch failure

11

Configuration error

15

Parasite flame

20

Push button control panel 

anomaly

24

Insufficient circulation

27

Loss of remote control 

communication

31

Low power supply voltage

37

Loss of flame signal

38

Block due to loss of 

continuous flame signal

43

Ignition block.

 The boiler ignites automati-

cally with each demand for room heating or hot 

water production. If this does not occur within 

10 seconds, the boiler goes into ignition block 

(code 01). To eliminate “ignition block” the Reset 

button (1) must be pressed. On commissioning 

or after extended inactivity it may be necessary 

to eliminate the “ignition block”. If this phe-

nomenon occurs frequently, contact a qualified 

technician for assistance (e.g. Immergas After-

Sales Technical Assistance Service).

Overtemperature thermostat block.

 During 

normal functioning, if a fault causes excessive 

overheating internally, the boiler goes into over-

temperature block (code 02). After allowing to 

cool, eliminate the “overtemperature block” by 

pressing the Reset key (1). If this phenomenon 

occurs frequently, contact a qualified technician 

for assistance (e.g. Immergas After-Sales Techni-

cal Assistance Service).

Fan anomaly.

 This occurs if the fan is blocked 

or if the intake or drain pipes are obstructed. If 

normal conditions are restored the boiler restarts 

without having to be reset. If this anomaly per-

sists, contact a qualified technician for assistance 

(e.g. Immergas After-Sales Technical Assistance 

Service).

General boiler board anomaly.

 This takes place 

if the boiler board microprocessor erroneously 

recognises a signal (code 04). To eliminate 

the “generic boiler board anomaly block”, it is 

necessary to press the Reset button (1). If this 

phenomenon occurs frequently, contact a qua-

lified technician for assistance (e.g. Immergas 

After-Sales Technical Assistance Service).

Delivery probe anomaly.

 If the board detects 

an anomaly on the delivery probe (code 05), the 

boiler will not start; contact a qualified technician 

for assistance (e.g. Immergas After-Sales Techni-

cal Assistance Service).

Domestic hot water probe anomaly.

 If the board 

detects an anomaly on the domestic hot water 

NTC probe, the boiler signals the anomaly. In this 

case the boiler continues to produce domestic 

hot water but not with optimal performance. 

Moreover, the anti-freeze function is prevented 

and an authorised technician must be called (e.g. 

Immergas After-Sales Service).

Maximum N° of reset.

 To eliminate any 

“anomaly” the Reset button (1) must be pressed. 

The Anomaly can be reset 5 times consecutively, 

after which the function in inhibited for at least 

one hour. One attempt is gained every hour for 

a maximum of 5 attempts.

Insufficient system pressure.

 Water pressure 

inside the heating system (code 10), sufficient to 

guarantee the correct functioning of the boiler, 

is not detected. Check that the system pressure 

is between 1÷1.2 bar.

Fumes pressure switch failure.

 It occurs in the 

case of an error on the circuit board that gives 

consent for fan start-up incorrectly or in the 

case of flue-gas pressure switch fault (code 11). 

If normal conditions are restored the boiler re-

starts without having to be reset. If this anomaly 

persists, contact a qualified technician for as-

sistance (e.g. Immergas After-Sales Technical 

Assistance Service).

Configuration error.

 If the board detects an 

anomaly or incongruency on the electric wiring, 

the boiler will not start. If normal conditions are 

restored the boiler restarts without having to be 

reset. If this anomaly persists, contact a qualified 

technician for assistance (e.g. Immergas After-

Sales Technical Assistance Service).

Parasite flame.

 This occurs in case of a leak on 

the detection circuit or anomaly in the flame 

control unit. (code 20), try to reset the boiler. 

If the anomaly continues contact a qualified 

technician (e.g. Immergas After-Sales Technical 

Assistance Service).

Push button control panel anomaly.

 This occurs 

when the circuit board detects an anomaly on the 

push button control panel. If normal conditions 

are restored the boiler restarts without having 

to be reset. If this anomaly persists, contact a 

qualified technician for assistance (e.g. Immergas 

After-Sales Technical Assistance Service).

Insufficient circulation. 

This occurs if the boiler 

overheats due to insufficient water circulating in 

the primary circuit (code 27); the causes can be:
- low circulation; check that no interception 

devices are closed on the central heating circuit 

and that the system is free of air (deaerated);

- pump blocked; free the pump.
If this phenomenon occurs frequently, contact a 

qualified technician for assistance (e.g. Immergas 

After-Sales Technical Assistance Service).