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User instructions 15 – 30 – 40 EN
5
Blocking operation (permanent status indication)
The burner stopped burning due to an incorrect situation. The display gives a permanent indication (not flashing) and the
operation can be restored by switching it off and on (volatile block).
U/
code
Reversed neutral and line
Power supply line not correctly connected
1 Flow sensor open circuit
Faulty flow sensor
Wiring interrupted or not correctly connected
1. Flow sensor short circuit
Faulty flow sensor
Faulty wiring
2 Return sensor open circuit
Faulty return sensor
Wiring interrupted or not correctly connected
2. Return sensor short circuited
Faulty return sensor
Faulty wiring
4 Flue gas sensor open circuit
Faulty flue gas sensor
Wiring interrupted or not correctly connected
6 Cold water sensor open circuit
Faulty internal tank sensor
Wiring interrupted or not correctly connected
6. Cold water sensor short circuited
Faulty internal tank sensor
Faulty wiring
A Flue gas temperature > 80°C The burner is reduced to low load
H Flow sensor > 105°C while the burner was off Reset the supply power by the on/off switch
E Internal error Reset the supply power by the on/off switch
P Pump test / Start function blocking / Water pressure
Check the central heating system pressure
Seized or faulty pump or faulty pump wiring
Faulty pressure sensor or wiring
nc Burner Manager fault Reset the supply power by the on/off switch
Lock-out (flashing status indication)
In case of lock-out the display gives a flashing indication and the operation can be restored by pressing the reset button, placed
on the control panel.
1 Boiler does not pass start temperature test Check system water flow; second system pump
2 Too many restarts
3
Internal regulation fault / A/D conversion fault /
external sensor fault /Too many restarts
5 Fan fault
7 Gas valve fault
8 Flame detected with closed gas valve Check gas valve
A Flue gas temperature > 95°C Check why flue gas becomes temperature > 95°C
E Internal interlock fault Reset the supply power by the on/off switch
H Flow sensor > 105°C with burner on Check system water flow
F Too many ignition attempts
O Gas valve connection Check short cut wire on print board terminal X4
5


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