195
5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Fault Codes
Displayed
Fault Code
System Characteristics
Cause
Measures
F 80
Burner control unit in a fault
state; system cools down;
burner control unit locked out
Short circuit, boiler water
temperature sensor, burner
control unit
Check lead and dual sensor;
replace sensor if required
F 81
Burner control unit in a fault
state
Sensor drift, boiler water
temperature sensor, burner
control unit
Check lead and dual sensor; replace
sensor if required
F 82
Burner control unit in a fault
state; system cools down;
burner control unit locked out
Short circuit, secondary boiler
water temperature sensor
(A or B), burner control unit
Check lead and sensors (A and B),
replace sensor if required
F 83
Burner control unit in a fault
state
Sensor drift, secondary boiler
water temperature sensor
(A or B), burner control unit
Check lead and sensors (A and B),
replace sensor if required
F 88
Burner control unit in a fault
state
Lead break, boiler water
temperature sensor, burner
control unit
Check lead and dual sensor; replace
sensor if required
F 89
Burner control unit in a fault
state
Lead break, secondary boiler
water temperature sensor
(A or B), burner control unit
Check lead and sensors (A and B),
replace sensor if required
F b7
Burner control unit in a fault
state; system cools down;
burner control unit locked out
Coding card not inserted
in the burner control unit;
incorrect or faulty coding card
Insert coding card; check coding card;
replace if required
F b7
Type of coding card
Coding card does not match
burner control unit
Replace coding card or burner control
unit
Danger
Plug-in terminals on the
burner control unit are ‘live‘. Only
replace the coding card when the
power has been isolated from the
burner control unit (via the internal
power disconnect inside the GW6C).
F d0
Burner control unit in a fault
state
Simultaneous selection of
multiple gas types at the
burner control unit via plug
lÖ
Check line, check wiring, replace
burner control unit, if required.
F E1
Gas pressure switch 2, GDW2
activated (closed on pressure
rise)
1st gas valve seat leaking/
GDW2. Gas pressure switch 2
activated/burner test firing
valve closed.
Check setting of gas pressure
switch 2; check connecting cable;
replace gas valve.
F E2
Gas pressure switch 2, GDW2
did not close during control self
diagnostics
Gas valve does not open, gas
valve leaking, gas pressure
switch faulty
Check setting of gas pressure
switch 2; check connecting cable;
replace gas valve
F E2
Shortage of gas to gas pressure
switch 2; valve leak test
Gas valve does not open;
gas valve leaking; gas
pressure switch 2 faulty.
Replace gas valve
General process faults
Fault display on the programming unit of the burner.
Note:
Carry out measures in the described order. All fault
codes are saved to the fault memory and the last
10 can be called up.
Burner Control Unit
