Faults Without Fault Display - Viessmann MatriX Service Instructions For Contractors

Troubleshooting
Fault codes
(cont.)
Detailed fault code Component/signal
3B Air pressure switch 2
60 Hall signal fan feedback
(RM-N)

Faults without fault display

Fault
Combustion faults due to
pulsation
Thermo-acoustics/combus-
tion noise
CO content too low
2
CO formation or burner is
very sooty.
Flame tears off during oper-
ation.
40
Cause of fault
High switching sequence,
switch flutters, external volt-
age
Fan speed too high. Incor-
rect fan or incorrect coding
card
Cause of fault
Excessive gas throughput
Insufficient or excessive air
Condensate backed up in flue
system
Flue outlet not installed correctly Check flue outlet and flue system.
Incorrect CO settings; insuffi-
2
cient or excessive air
Incorrect setting
Insufficient or excessive air
Insufficient draught in flue sys-
tem
Inlet strainer of gas train conta-
minated
Measure
Check flue gas path and re-
heating surfaces.
Check air pressure switch 2
setting.
Check the fan.
Check coding card.
Measure
Adjust gas throughput in accordance with the
rated boiler heating output.
Check condensate drain.
Adjust the burner in accordance with the details
in the table on page 18.
Check whether the burner has been set to the
correct gas type; change/remove the gas restric-
tor if necessary (see page 11).
Adjust burner in accordance with the details on
page onwards.
Correct the settings. Check ventilation in instal-
lation room.
Check flue system.
Remove flange and clean strainer.