28
Warning Er10
PROBLEM
The boiler water pressure exceeded the value set in the SP02 technical parameter (2300 mbar).
ACTION
After restoring the correct pressure by unloading the system, unlock the boiler by long pressing
the control panel on and off button.
CAUSE
A.
The system's faucet is not perfectly closed. Check that it is closed correctly.
B.
Load pressure is too high. Allow the heating water to cool until it reaches room
temperature. If cold the water pressure of the heating system is > 1 bar (1000mbar),
decrease the amount of water in the system until you have a pressure equal to 1 bar (1000
mbar). To do this, simply open the vent valve of any radiator in the heating system and let
out the necessary amount of water.
C.
Closed expansion vessel not enough. If the water pressure of the plant is cold 1 bar
(1000mbar), check the correct sizing of the closed expansion vessel or check that it is loaded
correctly
D.
Pressure transducer not working. Measure the power voltage of the pressure transducer
on contacts 37 and 39 of the electronic control unit. If the Voltage is different from 5 Volts
(VDC) replace the electronic control unit that does not power the pressure transducer.
Otherwise, measure the Pressure Transducer Signal Tension on contacts 38 (-) and 39(-) of
the electronic control unit. If the Tension is proportional to the water pressure (0.8bar plus
0.8 Volts – 1 bar plus 1 etc etc) then replace the electronic control unit that does not
correctly detect the pressure transducer signal. If the Tension is not proportional to the
water pressure, replace the transducer and its connecting cable because they do not work
properly.
Warnong Er11
PROBLEM
The watch of the electronic control unit does not work correctly because the data storage is
incorrect.
ACTION
Remove the 3-volt CR2032 button battery from the battery holder on the control board. Measure
the Battery Voltage which must be > 2.8 Volts (VDC).
Warning Er12
PROBLEM
The boiler was turned on, but the combustion did not start within the maximum allowed time;
Failed-Ignition
