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for the technician
First firing, regulation and servicing instructions
Crypt Warnings for Technical experts
On account of a malfunctioning, boiler can block and shows an alarm code in the middle of the
display.
Said alarms are displayed together with ‘Service’ writing which means that end user cannot reset
boiler by himself without a technical expert.
Note: All the alarms that can be reset by end user autonomously are described in section ‘User
instruction’.
E05 Heating system flow temperature sensor damaged
Cause: Control PCB has verified an anomaly in heating sensor (open or short circuit).
Solution: Disconnect sensor and measure its electric resistance. If it is found open or shorted,
replace it, otherwise check cables and electrical connections.
E12 Domestic Mini tank sensor damaged
Cause: Control PCB has verified an anomaly in Domestic Mini tank sensor (open or short
circuit).
Solution: Disconnect sensor and measure its electric resistance. If it is found open or shorted,
replace it, otherwise check cables and electrical connections.
E19 Filling not completed within available time
Cause: Automatic system filling has not be completed within 4 minutes.
Solution: Before switching boiler off, check water pressure on to the internal manometer: in
normal condition, with cold water, it should be 0.4÷0.9 bar. If problem is due to hydraulic
system a lower pressure will be found. Switch boiler off by pressing
and disconnect
electrical line. Switch boiler on again and check water pressure on the internal manometer
during filling.
If there is still a problem, verify water network pressure, automatic valve for filling, air
inside heating plant. Check if any drain valve has been opened or if there is a water
leakage in the heating system plant and repair it.
E21 Low water pressure in the primary/heating system (3 automatic filling already
executed)
Cause: During the last 24 hours boiler has executed 3 automatic filling to reset correct working
water pressure without success.
Solution: Before switching boiler off, check water pressure on to the internal manometer: in
normal condition, with cold water, it should be 0.4÷0.9 bar. If problem is due to hydraulic
system a lower pressure will be found.
Check if any drain valve has been opened or if there is a water leakage in the heating
system plant and repair it.
Switch boiler off by pressing
and disconnect electrical line. Switch boiler on again and
check water pressure on the internal manometer during filling.
