Safety Devices - Immergas NIKE Mini 24 Export Manual

Technical Documentation
Circulator antiblock device /
3-way valve
Electromechanical contacts
block
(safety thermostat and flue
safety thermostat)
Parasite flame block
No ignition block
Flue safety
thermostat block
(E6)
Safety thermostat block
(E4)
Insufficient circulation
Post-circulation pump
NTC probe breakage
(B1)
STNM ed 07/07

Safety devices.

The circulator (M1) and 3-way valve (M30) are turned on for 30 seconds after:
- 24 hours of inactivity with the boiler in the SUMMER (
- 3 hours of inactivity with the boiler in the WINTER ( )mode.
If there is strong resistance of the safety thermostat or flue safety thermostat contact
(contact not perfectly closed or worn), the integrated board performs a reset and starts a
new contact verification cycle; if, after 6 such cycles the problem hasn't been solved, the
boiler is blocked.
To get the boiler working again, press the "Reset" button (S3) and then make either a
d.h.w. or central heating request.
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 (without the gas valve being open)
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.
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
If the flue safety thermostat contact opens (poor stack draught) the boiler stops working
for 30 minutes.
If normal conditions are restored the boiler restarts without having to be reset.
To start the boiler before this time is up (30 minutes) power has to be cut off to the boiler,
taking the plug out of the mains socket momentarily.
If the overtemperature safety thermostat contact opens, boiler operation is blocked.
To get the boiler working again, press the "Reset" button (S3) and then make either a
d.h.w. or central heating request.
To prevent the water-gas exchanger from overheating in the case of a blocked pump or
very little water circulating in the primary circuit, when the central heating NTC delivery
probe (B1) detects as increase in the temperature that exceeds 5°C /second, the burner is
switched off. It restarts when the delivery temperature drops below 42°C.
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.
Breakage of the central heating delivery probe (B1) is signalled with the visual display of
error code 05 on the boiler display panel and stops operation in both the central heating
and d.h.w. mode.
30
Technical Documentation
(Stand-by) position or cutting power off to the circuit.
) mode.
NIKE Mini Export