Burner Fault Codes - Viessmann Vitotronic 300 GW6B Installation Instructions Manual

Vitotronic 300, GW6B Installation and Service

Burner Fault Codes

Displayed System characteristics
fault code
d1 Boiler cools down
d5 Boiler ramps to the electronic
maximum boiler water
temperature limit.
E1 Burner control unit in a fault
state.
E2 Burner control unit in
a fault state.
Shortage of gas to gas pressure
switch 2; valve leak test.
E3 Burner control unit in a fault
state.
E4 Burner shuts down
E5 Burner control unit in
a fault state.
EE Burner control unit in a fault
state.
EF Burner control unit in a fault
state.
E0 Operation according to internal
burner control unit defaults.
F1 Burner control unit in a fault
state; system cools down.
F2 Burner control unit in a fault
state; system cools down.
F3 Ionization flame monitor reports
faulty flame signal during start-
up or after the post-purge.
Cause
Burner fault
No communication between
boiler circuit and cascade
control unit
Valve 1 not tight / gas pressure
switch 2 does not open.
Valve 2 not tight; gas pressure
switch 2 does not close.
Gas valve does not open; gas
valve leaking; gas pressure
switch 2 faulty.
Lead break, strapping plug fJ.
Multiple detection of
undervoltage with return and
renewed undervoltage.
Internal fault of the burner
control unit and during test of
ionization input.
Internal error in feedback from
gas safety valves; output relay
does not respond.
Internal error in feedback from
gas safety valves; output
relay does not respond.
Communication error, burner
control unit.
Flue gas excess temperature;
excessive gas throughput.
Excessive boiler water
temperature.
Gas valve not gas tight (gas is
escaping and burning);
incorrect coding card.
Troubleshooting
Measures
Check the burner.
Check communication by
means of a participant check.
Check setting of gas pressure
switch 2; check connecting
cable; replace gas valve.
Check setting of gas pressure
switch 2; check connecting
cable; replace gas valve.
Replace gas valve.
Check strapping plug fJ.
Check the power supply.
Replace burner control unit.
Reset burner control unit;
replace burner control unit.
Reset burner control unit;
replace burner control unit.
Check plug and KM BUS
to burner control unit.
Wait until temperature falls
below the permissible flue gas
temperature. Reset burner
control unit. Check water level;
check heat exchanger surfaces
for contamination; check CO
setting; set gas throughput
according to rated heating
output of boiler (for connection
values, see boiler service
instructions).
Wait until temperature falls
below the permissible boiler
water temperature.
Reset burner control unit.
Check ionization path; replace
coding card; replace gas valve.
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