Internal System Fault; Faults Without Fault Display - Viessmann MatriX Service Instructions For Contractors

Fault codes
(cont.)

Internal system fault

Internal system faults are created if a perfect program
sequence can no longer be guaranteed.
Display System characteristics
F E5, F EC, F Fault around burner control
Ed, F Fd, F FF unit

Faults without fault display

Fault
Combustion faults due to pulsa-
tion
Thermo-acoustics/combustion
noise
CO content too low
2
CO formation or burner is very
sooty
Flame tears off during operation
Flue gas temperature too high
Cause
Internal system fault and
EMC
Cause of fault
Excessive gas throughput
Insufficient or excessive air
Condensate backed up in flue
system
Flue outlet not installed correct-
ly
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
Excessive gas throughput
Troubleshooting
Measures
Reset burner control unit. Replace
the burner control unit if the fault
persists
Measure
Adjust gas throughput in accordance with
rated boiler heating output
Check condensate drain.
Check flue outlet and flue system.
Adjust burner in accordance with the details
from page 11.
Check whether the burner has been adjus-
ted to the correct gas type; change gas re-
strictor if required (see from page 7).
Adjust burner in accordance with the details
from page 11.
Correct the settings. Check ventilation in in-
stallation room.
Check flue system.
Remove flange. Clean strainer.
Adjust gas throughput in accordance with
the rated boiler heating output. Check condi-
tion of secondary heating surfaces of the
boiler and clean if required.
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