Immergas EOLO STAR 24 5E, Instruction Manual

21

INS

TALLER

US

ER

MAINTEN

AN

CE TECHNI

CI

AN

Error 

Code

Anomaly signalled

Cause

Boiler status / Solution

27

Insufficient circula-

tion

This occurs if there is overheating in the boiler due to insufficient water 

circulating in the primary circuit; the causes can be: 
-  low system circulation; check that no shut-off devices are closed on 

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

- circulating pump blocked; free the circulating pump.

If normal conditions are restored the boiler 

restarts without having to be reset (1).

28

Domestic hot water 

leakage

If during the heating phase, a rise in domestic hot water temperature 

occurs, an anomaly is signalled and heating temperature is reduced 

to limit the formation of limescale in the heat exchanger.

Check that all domestic hot water system 

cocks are closed and are not drawing and 

check also that there are no leaks in the 

system. Once good conditions are restored 

in the domestic hot water system, the boiler 

returns to normal functioning (1)

31

Loss of remote control 

communication.

This occurs if an incompatible remote control is connected, or if 

communication between the boiler and the remote control is lost.

Disconnect and reconnect the power to the 

boiler. If the Remote Control is not de-

tected on re-starting the boiler will switch 

to “Summer” local operating mode. In this 

case, the controls on the control panel of 

the boiler are enabled again (1).

36

IMG BUS communi-

cation loss

Communication loss on the IMG BUS protocol

The boiler does not satisfy the room heating 

requests (1).

37

Low power supply 

voltage

This occurs when the power supply voltage is lower than the allowed 

limits for the correct boiler operation. 

If normal conditions are restored the boiler 

restarts without having to be reset (1).

38

Loss of flame signal

This occurs when the boiler is ignited correctly and the burner 

flame switches off unexpectedly; a new attempt at ignition is 

performed and if normal conditions are restored, the boiler does 

not have to be reset.

Note:

 when attempting ignition, the minimum heat output of 

the boiler increased to a maximum of two consecutive ignitions; 

the minimum heat output conditions are reached once again, 

as per gas valve calibration, following the "P.C.B. PERIODIC 

AUTO-VERIFICATION" function or simply disconnecting the 

power supply to the boiler.

(1).

43

Block due to loss of 

flame signal

This occurs if the ''Flame signal loss (38)'' error occurs many times 

in a row within a preset period.

Press the Reset button (1).

44

Block for exceeding 

the maximum ope-

nings close to the gas 

valve

This occurs if the gas valve remains open for longer than required 

for normal operation, without

the boiler switching on. 

Press the Reset button (1).

59

Supply voltage fre-

quency anomaly

The board detects a main supply voltage frequency anomaly.

The boiler does not start (1).

80

Block - gas valve 

driver issue

- This occurs in the event of malfunctions of the P.C.B. that controls 

the valve.

Press the Reset button (1).

85

Afterburner problem 

block

Potential gas valve, electrode or P.C.B. problem.

Press the Reset button (1).

98

Block - maximum no. 

of software errors

The maximum number of software errors possible has been reached. Press the Reset button (1).

(1) If the shutdown or fault persists, contact an authorised company (e.g. Technical After-Sales Service).