Viessmann MatriX radiant burner Service Instructions Manual page 28

Troubleshooting
Diagnostics
(cont.)
Fault System
code characteristics
26
Ionisation flame
monitor signals monitor signals
external light during t
start−up or after
run−on time
27
Flame extinguishes
during operation during operation
29 Burner control unit in
fault state
2A
2b
2C
2d
2E
2F
31
28
Cause
Ignition cables short
circuited
l li ht d i
Ionisation cables or
electrode short
circuited
Gas combination
valve leaks
Parameter set
incorrectly adjusted
Incorrect gas type
selected
Burner gauze
assembly faulty
Parameter set
incorrectly adjusted
Internal fault, gas
governor input
Internal fault, air
pressure switch
input
Internal fault
monitor
Fault during safety
inputs test
Internal fault
voltage monitor
Internal fault
voltage failure
monitor
Internal fault
demand
Error in feedback
from gas safety
valves, output relay
does not activate
Remedy
Remedy short circuit
Remedy short circuit
Replace gas
combination valve
Adjust parameter set
(see page 23 and 24)
Adjust gas type
(see page 7)
Replace burner
gauze assembly
Adjust parameter set
(see page 23 and 24)
Replace burner
control unit
flame
low
heat