Atmos
Heating Systems
Installation and user manual EN_FMT
19
4.11. Display
A = display
B = + button
C = Set / Reset
D = Status display
E = - button
During operation, the display shows the status of the
unit in the form of a code. To be able to read the codes,
open the cover in front of the display. The display
consists of three 7-segment LED’s + three decimal
points and three pushbuttons.
The left 7-segment LED shows the status or the menu
step.
The two right 7-segment LED's show the temperature,
the pressure or the parameter value.
4.11.1. Normal operation (permanent status indication)
The Normal operation is to indicate the burner action.
- -
Initialisation after restoration of supply power
O
No heat demand, stand-by
C
Central heating heat demand, burner off
C. Central
heating
heat demand, burner on
P/C. Central
heating heat demand, low load water pressure
A/C. Central
heating
heat demand, low load chimney temperature
c
Central heating pump post-running
b
Burner off / post-running of pump for external HWS cylinder
b. Burner
on
P/b.
Boiler, low load by water pressure
A/b.
Boiler, low load by chimney temperature
O
Frost protection burner off pump running 8C
o.
Frost protection burner on 3C
C (flashing)
Chimney function (temp display max/min/ionisation)
4.11.2. 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
n.a.
6.
Cold water sensor short circuited
n.a.
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
4.11.3. 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
