GB-21
D
GB
F
NL
I
E
•
If the measures described above do not help, the
unit has probably suffered a hardware defect –
remove the unit and return it to the manufacturer
for inspection.
0
? The display blinks and indicates
0
.
!
The “no flow” state check of the air pressure
switch has failed.
•
Check the function of the air pressure switch.
Before the fan is switched on, there must be no
high signal at the input for air monitoring (termi-
nal 47) when air monitoring is activated.
1
? The display blinks and indicates
1
.
!
The operating check of the air pressure switch
has failed. The air monitor, depending on the
parameter setting for input 47 or 48 (P15 and
P35), has not switched after fan start-up.
•
Check the air monitor wiring.
•
Check the air pressure switch setpoint.
•
Check the function of the fan.
P
? The display blinks and indicates
P
.
!
The input signal (terminal 48) for the air pressure
switch has dropped out during pre-purge.
•
Check the air supply during the purging process.
•
Check the electrical wiring of the air pressure
switch.
•
Check voltage supply to terminal 48.
•
Check the air pressure switch setpoint.
8 0
?
The display blinks and indicates
80
.
!
Burner 1 flame amplifier is defective.
•
Remove the unit and return it to the manufacturer
for inspection.
8 5
?
The display blinks and indicates
85
.
!
Burner 2 flame amplifier is defective.
•
Remove the unit and return it to the manufacturer
for inspection.
2
3
8
4
6
5
7
? The display blinks and indicates
2
,
3
,
4
,
5
,
6
,
7
or
8
.
!
The input signal for the air pressure switch has
dropped out during start-up/operation at pro-
gram step X (02 to 08).
!
Failure of the air supply at program step X.
•
Check the air supply.
•
Check the air pressure switch setpoint.
A
?
The display blinks and indicates
A
.
!
No “Minimum capacity reached” signal from
actuator.
•
Check the butterfly valve and the function of the
limit switches in the actuator.
•
Check the wiring.
•
Check the actuator.
•
If the fault cannot be remedied by doing this,
remove the unit and return it to the manufacturer
for inspection.
A
?
The display blinks and indicates
A
.
!
No “Maximum capacity reached” signal from
actuator.
•
Check the butterfly valve and the function of the
limit switches in the actuator.
•
Check the wiring.
•
Check the actuator.
•
If the fault cannot be remedied by doing this,
remove the unit and return it to the manufacturer
for inspection.
A
?
The display blinks and indicates
A
.
!
No “Ignition capacity reached” signal from actua-
tor.
•
Check the butterfly valve and the function of the
limit switches in the actuator.
•
Check the wiring.
•
Check the actuator.
•
If the fault cannot be remedied by doing this,
remove the unit and return it to the manufacturer
for inspection.
