Fault Codes; General Process Errors - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service

Fault Codes

General process errors

Fault display on the display interface and programming
unit on 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.
Displayed System Characteristics
Fault Code
F 80 Burner control unit in a fault
state; system cools down;
burner control unit locked out
F 81 Burner control unit in a fault
state
F 82 Burner control unit in a fault
state; system cools down;
burner control unit locked out
F 83 Burner control unit in a fault
state
F 88 Burner control unit in a fault
state
F 89 Burner control unit in a fault
state
F B7 Burner control unit in a fault
state; system cools down;
burner control unit locked out
F B7 Type of coding card
F E1 Gas pressure switch GDW2
activated (closed on pressure
rise)
F E2 Gas pressure switch GDW2 did
not close during control self
diagnostics
F E4 Burner shuts down
F E5 Burner control unit in a fault
state
Cause
Short circuit, boiler water
temperature sensor, burner
control unit
Sensor drift, boiler water
temperature sensor, burner
control unit
Short circuit, flue gas
temperature sensor (A or B),
burner control unit
Sensor drift, flue gas
temperature sensor (A or B),
burner control unit
Lead break, boiler water
temperature sensor, burner
control unit
Lead break, flue gas
temperature sensor (A or B),
burner control unit
Coding card not inserted
in the burner control unit;
incorrect or faulty coding card
Coding card does not match
burner control unit
1st gas valve seat leaking/
GDW2. Gas pressure switch
activated/burner test firing
valve closed.
Gas valve does not open, gas
valve leaking, gas pressure
switch faulty
Multiple detection of
undervoltage
Internal fault of the burner
control unit and during test of
ionization input
Troubleshooting
Measures
Check lead and dual sensor;
replace sensor if required
Check lead and dual sensor; replace
sensor if required
Check lead and sensors (A and B),
replace sensor if required
Check lead and sensors (A and B),
replace sensor if required
Check lead and dual sensor; replace
sensor if required
Check lead and sensors (A and B),
replace sensor if required
Insert coding card; check coding card;
replace if required
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 (inside the junction
box).
Replace gas valve.
Check cables, check gas pressure
switch, replace gas valve
Check the power supply
Replace burner control unit
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