34
for the technician
First firing, regulation and servicing instructions
E22 Imprecise data storing
Cause: Mistake while setting data, storing an unlikely value.
Solution: Switch boiler off by pressing
and disconnect electrical line. Switch boiler on
again.
If problem still exists, check and NOTE all parameter values. Then set all parameters to
DEFAULT values (see “Regulation programming”) taking care to press
to store each
value. Switch boiler off and then on again by pressing and set:
• Heating temperature = 40°C (using
and );
• Domestic water temperature = 45 °C (using
and ).
This “rewriting default settings” operation should restore boiler functioning. If problem still
exists, substitute modulation PCB, set all previously noted values and make usual regulation.
Otherwise, if alarm disappears, try to re-insert all previously noted values, or perform all
boiler regulations.
E29 Modulation gas valve coil damaged (short circuit)
Cause: Control PCB has detected a short circuit in Gas modulation valve coil. In this case
coil is not fed and boiler works at minimum power.
Solution: Unplug connectors from modulation gas valve coil and measure coil electric
resistance (47.7÷52.3 ohm at 20°C). If it is found faulty replace it and regulate boiler,
otherwise check cables and electrical connections.
E31 Remote control* (Hermann optional kit only) not working
* This applies to Hermann Remote Control optional kit only, and not to third parties chrono
thermostats.
Cause: Control PCB has verified the presence of a remote control but data are not readable.
Solution: Check remote control and its connections.
Remark: in case of Remote Control malfunctioning, boiler works in DHW only. To make
boiler provisionally work in heating, restore TA jumper on main PCB (see “Electrical
connections” in Installation section), turn boiler in Winter mode by pressing knob
and adjust heating elements’ temperature using and . DHW temperature will
be adjusted manually too, using and .
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