41
User instructions
for the user
Moreover, the boiler in stand-by activates periodically the main internal components to prevent the
exceptional cases of Lock out due to the inactivity in presence of water and scale. This happens
also if the boiler goes in Lock Out state (red lamp on or flashing).
Note: if you want to use the “room anti-freeze” function that is often available in common room
thermostats or chronothermostats, it is necessary to leave the boiler in Winter
mode and
NOT in stand-by.
Incidental not functioning
THE BURNER DOESN’T TURN ON
— If the room thermostat is installed, check that this is regulated with an higher temperature in
respect of that of the place where it is installed;
—
check that there is electrical supply and that the Summer/Winter Selector isn’t on 0 (stand-by)
but on SUMMER
or WINTER
. The GREEN lamp must be constantly ON (see details
in the paragraph “Working and warning indicators”);
—
if the Lock Out red lamp is on or flashing, see the paragraph “Working and warning indicators”;
—
check on the gauge that the boiler pressure is correct (1÷1.5 bar in a
cold
state) or at least not
lower than 0.5 bar.
— On SE models, the burner could not ignite because of an incorrect flue flow, or a fault to the
relevant safety device. Ask the technician to check that inlet and outlet ducts are clean and in a
good state. During installation, all laws and rules in force, and slopes and lenghts described in
“Chimney connections” and “Flue systems”, must be respected. Ask the technician to check the
correct functioning of the flue safety device (flue pressure switch) considering that a wrong
slope of the outlet duct may make some condense to reflow to the boiler and damage the flue
pressure switch.
SHORTAGE OF DOMESTIC HOT WATER PRODUCTION
— make sure that D.H.W. thermostat
is not set on a too low position;
— call a qualified technician to check gas valve regulation;
— call a qualified technician to check, and eventually clean, d.h.w. exchanger.
Remark: where the water hardness value is too high, it is suggested the installation of a
softening device, in order to prevent the limestone precipitation; this operation avoids a
frequent cleaning of the coil.
Do not try to repair the gas boiler by yourself.
For any intervention on the electrical, hydraulic or gas circuit exclusively call a qualified
technician.
The gas boilers must be fitted with original accessories only.
HERMANN Ltd. is not responsible for damages caused by the incorrect, wrong or
unreasonable use of non-original materials.
Summary of Contents for Supermicra 23 E
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