Viessmann MatriX Service Instructions Manual page 34

Troubleshooting
Diagnostics
(cont.)
Fault System
code characteristics
26
Ionisation flame
monitor signals
external light during t l li ht d i
start−up or after the
post−purge period
27
Flame extinguishes
during operation
g p
29 Gas burner control
unit enters fault state
2A
2b
2C
2d
2E
2F
34
Cause
Ignition cables
short−circuited
g
Ionisation cables or
electrode
short−circuited
Gas combination
valve leaks
Incorrect parameter
set selected
Incorrect gas type
selected
Burner gauze faulty
Incorrect parameter
set selected
Combustion
characteristics not
ideal
Internal fault
governor input
Internal fault
pressure limiter input
Internal fault
monitor
Fault during test of
safety inputs
Internal fault
voltage monitor
Internal fault
failure monitor
Internal fault
demand
Remedy
Remedy short circuit
Remedy short circuit
Replace gas
combination valve
Adjust parameter set
(see pages 28 and 30)
Adjust gas type
(see page 7)
Replace burner gauze
Adjust parameter set
(see pages 28 and 30)
Adjust burner
(see pages 14 and 15)
gas Replace gas burner
control unit
air
flame
low
voltage
heat