Display Diagnostic - Biasi Activ A 25C Service Manual

4.1

Display diagnostic

An help for the fault finding may be given by the display
indications.
The display on the control panel gives many informa-
tion.
Only the indications useful for the fault finding are here
described.
The following table gives the relationship between the
indications of error of the display and their meaning.
Er 01 + RESET Lack of burner ignition
Er 02 + RESET Safety thermostat lockout
Er 03 + RESET Other faults
Faulty primary circuit (no water or
Er 04 +
absence of flow)
Er 05 + Faulty fan control system
Faulty c.h. temperature probe
Er 06 +
NTC
Faulty d.h.w. temperature probe
Er 07 +
NTC
Faulty external temperature probe
Er 08 +
NTC (if fitted)
Faulty flue temperature probe
Er 09 +
NTC
Lockout --- flue temperature probe
Er 10 + RESET
NTC (Flue temperature > 120 ˚C)
Er 11 + RESET Parasite flame
Faulty primary circuit (no water or
absence of flow) (temperature in-
Er 14 +
crease > 2K/s) (the boiler can't
restart for 10 minutes)
Faulty pump (absence of water
Er 14 + RESET flow in the main circuit) or primary
temperature above 105 ˚C
Primary circuit temperature limit
Li 01
during d.h.w. operation
10