Immergas ZEUS Mini Manual De Instrucciones Y Advertencias página 83

Ignition block. Each time heating or hot water production is required the boiler
is turned on automatically. If this does not occur within 10 seconds, the boiler
activates an "ignition block" (red indicator lamp 2 ON). To eliminate the block,
rotate the main switch (3) temporarily to the Reset position. On initial ignition
or following a prolonged period of disuse the ignition block may need to be
inhibited. If this function is activated repeatedly, contact a qualified technician
for assistance (e.g. Immergas Technical Services Centre).
Overtemperature block. During operation, if a fault causes excessive overheating
inside, the boiler goes on overtemperature block (indicator lamp 2 flashing). To
eliminate the "overtemperature block", turn the main switch (3) temporarily to
the Reset position. If this function is activated repeatedly, contact a qualified
technician for assistance (e.g. Immergas Technical Services Centre).
Air pressure switch activation failure. This fault condition occurs if the intake
or exhaust pipes are blocked or there is a fan fault or a flame check unit fault. If
normal conditions are restored the boiler resumes operation without requiring
reset. If this anomaly persists, contact a qualified technician for assistance (e.g.
Immergas Technical Assistance Service).
Lack of water in boiler. Not enough water pressure detected in the heating
circuit to guarantee correct boiler operation. Make sure that the pressure in the
system is between 1÷1,2 bar.
System delivery NTC sensor fault. If the unit detects an anomaly in the system
delivery NTC sensor, the boiler will not start; call a qualified technician (e.g. the
Immergas Technical Assistance Service).
Domestic circuit NTC sensor fault. If the unit detects an anomaly in the do-
mestic circuit NTC sensor, the boiler will not produce domestic hot water; call
a qualified technician (e.g. the Immergas Technical Assistance Service).
No water circulating. This occurs if there is overheating in the boiler due to
insufficient water circulating in the primary circuit; the causes can be:
- low circulation; check that no shutoff devices are closed on the heating circuit
and that the system is free of air (deaerated);
- circulating pump blocked; free the circulating pump.
If this function is activated repeatedly, contact a qualified technician for assistance
(e.g. Immergas Technical Services Centre).
Restoring heating system pressure.
Periodically check the system water pressure. The boiler pressure gauge should
read a pressure between 1 and 1.2 bar.
If the pressure falls below 1 bar (with the circuit cool) restore normal pressure via the
valve located at the bottom of the boiler (see figure).
N.B.: close the valve on completion.
If pressure values reach around 3 bar the safety valve may be activated.
In this case contact a professional technician for assistance.
In the event of frequent pressure drops, contact qualified personnel for assistance
to eliminate system leakage.
GAS COCK
FILLER COCK
Draining the system.
To drain the boiler, use the special drain cock.
Before draining, ensure that the filling valve is closed.
Draining the boiler.
To drain the boiler, use the special drain cock.
N.B.: Before carrying out this operation, close the boiler cold water inlet cock
and open any domestic circuit hot water cock to allow air to enter the boiler.
Anti-freeze protection.
The boiler comes standard with an anti-freeze function that starts the pump
and burner when the water temperature inside the boiler falls below 4°C and
stops on exceeding 42°C. The anti-freeze function is guaranteed if the boiler is
fully operative and not in "block" status, and is electrically connected with the
DOMESTIC WATER
INLET COCK
main switch is set to Summer or Winter. To avoid continued operation in the
event of prolonged absence, the system must be drained completely or anti-
freeze substances should be added to the heating system water. In both cases the
boiler domestic water circuit must be drained. In appliances subject to frequent
draining, the system must be refilled with suitably treated water to eliminate
hardness that may cause limescale formation.
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