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The boiler control box is equipped with a microprocessor that memorises and signals any faults or shutdowns.
The fault type is indicated by a code.
The meaning of each code is given in the table below:
FAULT CODE (read-only display)
1
st
Figure
Fault
2
nd
Figure
0
1
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
9
9
9
9
00
01
02
03
04
05
06
07
10
11
13
14
15
16
17
24
26
30
31
32
36
37
41
42
44
60
08
28
29
12
18
19
25
Flame detection circuit fault
24 V short circuit
No detection, no flame on burner
Board fault
Internal board fault (e.g. power failure)
Board fault
Board fault
Board fault
Board fault
Board fault
Board fault
Board fault
Board fault
Board fault
Board fault
NTC1/NTC2 connection switched over
Minimum gas pressure (at pressure switch)
Difference
∆
T between T1 and T2 exceeded (>35
°
C)
NTC1 short circuit
NTC2 short circuit
NTC1 open
NTC2 open
Board fault
Board fault
Board fault
Board fault
Air pressure switch failure
Fan not working, no tachometer signal
Fan continues running, erroneous tachometer signal
No-water pressure switch
TST tripped (>98
°
C)
Return temperature T2 too high (>88
°
C)
Temperature T1 varies too quickly (T1 = delivery temperature)
