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3 Press the RESET button to reset. The unit then

reverts to the last operating mode selected.

▷ Possible faults:

Display

4 If the burner control unit does not respond even

though all the possible faults have been rectified

as described below, contact your supplier.

? Fault

! Cause

• Remedy

? The 7-segment display has gone out despite

the voltage supply being OK?

! Fuse F2 is defective.

• Check the fuse contacts.

There is a spare fuse directly next to the fuse

holder.

Attention! Fit the correct fuse for 4 A.

? Error code F. and 1 flash alternately?

On burner start-up, the burner control unit has

not detected a flame during the safety time. Sev-

eral automatic start-up attempts will be com-

D – 49018 Osnabrück, Germany

pleted if a restart has been programmed.

ACU

! Inadequate inlet pressure available.

• Check the inlet pressure.

! Ignition is not working properly.

• Check the connection of the ignition cables for

damage or moisture. The spark plug must be

fitted correctly.

• Check the ignition spark acoustically during the

3-second ignition time from the burner fan side.

• Clean the spark electrode.

• Check the ignition transformer and replace it if

necessary.

! Poor flame signal due to incorrect burner adjust-

ment.

• Readjust the CO

ing the heater).

RGA100_NF.indd 15

Fault type

Flame fault

Air fault

Temperature fault

Electronics fault

Other possible faults

value, see page 10 (Adjust-

! Poor flame signal due to dirty or badly connected

flame rod.

• Check the flame rod and clean it with fine abra-

sive paper if necessary.

• Check the cable connection, cable and terminal

boot for damage or moisture. The terminal boot

must be fitted correctly.

• Check the yellow and green burner ground cable

for corrosion and to ensure it is firmly connected.

• The flame rod is defective and must be replaced.

! Air in the gas pipe.

• Vent the gas pipe.

! Valves do not open.

• Disconnect the valve plug on the gas combina-

tion control and measure the voltage at the valve

plug during the safety time.

• If the voltage is not adequate, first check fuse F2

(4 A). If the display and the LEDs are not lit, it is

defective.

• If the voltage is not adequate, replace the gas

combination control and return it to the supplier.

? Error code F. and 1 flash alternately and the

light is red?

The fault could not be rectified. All start-up at-

tempts have been used and the burner control

unit goes into lock-out.

▷ Reset is only possible by pressing the RESET

button on the burner control unit or using the

remote reset if there is one.

• Rectify the cause of the fault as described above

for warning F.1.

? Error code F. and 2 flash alternately?

The flame has gone out during operation. If a

restart has been programmed, an automatic

restart will be completed.