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3 Press the RESET button to reset. The unit then
reverts to the last operating mode selected.
▷ Possible faults:
Display
F
A
C
E
U
P
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.
L
N
There is a spare fuse directly next to the fuse
holder.
Attention! Fit the correct fuse for 4 A.
? Error code P. and 1 flash alternately and the
light is red?
D – 49018 Osnabrück, Germany
ACU
! Pressure switch does not switch.
• Check inlet pressure p
! Gas pressure on the burner too low.
• Readjust gas pressure p
control, see page 8 (Adjusting the heater).
! Fuse F2 defective.
• Replace fuse (3.15 A, slow-acting, H). Ensure
that only one heater is directly wired to the ther-
mostat, see page 3 (Wiring).
GP_95_ACU_NF.indd 13
Fault type
Flame fault
Air fault
Temperature fault
Electronics fault
Other possible faults
Gas-related faults
LT
L
N
L
N
N
.
u
on the combination
G
? Error code P. and 2 flash alternately and the
light is red?
! During three consecutive restarts, the gas pres-
sure switch has tripped during the safety time
or flame proving period (gas pressure switch
oscillates).
• Inlet pressure fluctuates. Establish stable gas
supply.
• Gas pressure p
G
sure p
, see page 8 (Adjusting the heater).
G
? Error code A. and 1 flash alternately?
! Vane switch switches off during burner operation.
• Check the function of the vane switch, see
page 18 (Maintenance).
LV
• Vane, fan or grille are dirty. Clean, see page 18
1
2
1
L
i
(Maintenance).
• Fuse F1 defective (8 A, slow-acting, H). Check
the function of the fan and replace fuse F1 if
necessary.
! Motor defective.
• Remove the device and return it to the supplier.
? Error code A. and 2 flash alternately?
! Vane switch does not switch off during the "no
flow" state check on burner start-up.
• Check that the vane switch is functional, see
page 18 (Maintenance).
? Error code A. and 2 flash alternately and the
light is red?
! The fault "Vane switch" could not be rectified.
The programmed number of start-up attempts
having failed, the ACU initiates a fault lock-out.
• Reset using the RESET button on the ACU or
via the remote reset.
• Check that the vane switch is functional, see
page 18 (Maintenance).
GB-13
too low. Readjust gas pres-
0 V
2
–
+V
V
+T
mA
13.09.20 22:52
+
