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for the user
Cause 1: Burner flame has not been successfully ignited or it has suddenly stopped.
Solution: Press ‘Reset’ button to re-ignite boiler.
If problem occurs again, check boiler and main gas tap, verifying gas network too.
Cause 2: Electrical connections are wrong.
Solution: Press ‘Reset’ button to re-ignite boiler.
If problem still exists, call a qualified technician to check Live, Neutral and Earth wirings, in
particular Live and Neutral must not be reversed. Otherwise, boiler can’t detect flame on
burner, and blocks.
The problem may be located in electrical distribution network too (unbalanced Neutral).
E02 Safety device interference
Red light: constantly on Alarm type: reset
Cause 1: Flue has not perfectly evacuated (maybe temporary, maybe on account of sudden
strong wind gust)
Solution: Press ‘Reset’ button to re-ignite boiler. If block insists:
• Check flue chimney
On “E” models:
• Check that the outlet which communicates with the outdoor, compulsory according to the
law, is not obstructed by pieces of furniture against the wall or by other objects. It is however
normal that the outlet is realized behind a radiator. The outlet must be of the dimension
prescribed by the law and must be cleaned inside: some types have an anti-insects net
which could have been dirtied by dust or by spider’s webs. Call a Qualified Technician
when it is necessary. [place here references to national laws or rules about openings requirements
(if any)]
• If in the room where the boiler is installed there are fireplaces, mantelpieces, stoves, coal
stoves or similar, fans for the Air Outlet, such as wall fans, aspiring cowls for cooking
boards with outlet pipe, let the technician check that the inlet is correctly OVERSIZED or
that there are the ADDITIONAL inlets as prescribed by the laws in force, because, otherwise,
these devices interfere with the evacuation of the Boiler’s Flue. [place here references to
national laws or rules about this matter]
On “SE” models:
• Check that the Inlet/Outlet Ducts, the respective terminals and the device for the checking
of the correct Flue Outlet (Flue Pressure Switch) are clean and in good condition. During
the Installation Process it is necessary to respect the prescriptions included in the national
and local regulations and laws, in addition to the slopes and measurement included in the
paragraphs “Chimney connections” and “Flue systems”.
Cause 2: Boiler is overheated and safety thermostat forced boiler to block.
Solution: Wait 20/30 minutes to cool boiler down then press ‘reset’. If block happens again,
please contact a [Hermann Technical Centre] [qualified technician].
E05 Heating system flow temperature sensor damaged
Red light: flashing Alarm type: service
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