23
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
To prevent the water-gas exchanger from overheating in the case of a blocked pump or
if there is not much water circulating in the primary circuit, when central heating NTC
delivery probe (B1) detects an increase in temperature that exceeds 5°C/second, the burner
is switched off.
It restarts when delivery temperature drops below 42°C.
Insufficient circulation
Breakage of the central heating delivery probe (B1) is signalled with the visualisation of
error code 05 on the boiler display and stops operation in both the central heating and
domestic hot water mode.
Breakage of the d.h.w. probe (B2) is signalled with the visualisation of error code 06 on
the boiler display and stops operation in the d.h.w. mode but the central heating mode
is still allowed.
NTC probe breakage
(B1 and B2)
If the overtemperature safety thermostat contact opens, boiler operation is blocked.
To get the boiler working again press the “Reset” (S3) push button and then make either
a domestic hot water or central heating request.
Safety thermostat
block
(E4)
To prevent the water-gas exchanger from overheating, at the end of each central heating, an-
tifreeze or “chimneysweep” request, the circulator (M1) keeps working for 30 seconds.
Post-circulation pump
After the burner has been switched off at the end of any type of request, the combustion
chamber is washed, keeping the fan working for 30 seconds.
Sealed chamber post
ventilation
To prevent the water-gas exchanger from overheating, if the boiler temperature detected by
the NTC delivery probe (B1) exceeds 90°C, the fan is switched on until the temperature
drops below 85°C.
Delivery overtemperature
ventilation
If the flue pressure switch contact opens while the fan is working, the boiler stops.
If normal conditions are restored, the boiler restarts without having to be reset.
If it closes with the fan off, it does not enable start of the ignition cycle.
Flue pressure
switch block
(S6)
Boiler operation is blocked if there is a dispersion in the detection circuit or a malfunction
of the flame control that generates an ionisation current lasting at least 20 seconds.
To get the boiler working again, press the “Reset” button (S3) and then make either a
d.h.w. or central heating request.
Parasite flame block
(from October 2005)
If, within 10 seconds from the start of the ignition cycle the detection electrode (E2) fails
to detect the flame on the burner, boiler operation is blocked.
The integrated board makes 2 ignition attempts lasting 10 seconds with an interval of 30
seconds after which it shuts down.
To get the boiler working again, press the “Reset” button (S3) and then make either a
d.h.w. or central heating request.
NOTE:
The malfunction can be reset up to 5 consecutive times after which the function is
inhibited for at least one hour and you gain one attempt each hour; or you gain 5 attempts
putting the boiler in the Stand-by ( ) position or cutting power off to the circuit.
No ignition block
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