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16
Rectifying faults
4.2.2 Faults that are not displayed
Appliance faults
system boiler
combi boiler
Page
Boiler indicates P1, P2, P3 at
start-up and then restarts with
P1..
XX 36
Excessive burner noise, rumbling
noises
XX 36
Flue gas levels incorrect, CO
level too high
XX 38
Ignition too harsh, ignition poor X X 39
Loose or broken contact on
DHW cylinder NTC sensor
X 40
Hot water has unpleasant odour
or is dark colour (system boiler)
X 41
Text display fails to respond, no
display or display incorrect
XX 41
Condensation in the flue pipe X X 41
Inadequate hot water outlet tem-
perature (combi boiler)
X 42
Table 3
Programmer faults Page
Set room temperature not reached (TR 2) 43
Set room temperature not reached (inte-
grated text display)
43
Set room temperature exceeded by large
amount (TR 2)
44
Heating up takes too long (integrated text
display)
44
Excessive fluctuations in room temperature
(integrated text display)
45
Room temperature too high in Economy
mode
45
Incorrect or no modulation 45
No programmer display or programmer dis-
play does not react
45
Table 4
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