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Vitodens 200-W, B2HE Quick Start-up Guide
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F.378
Burner in a
fault state
Flame loss during
stabilization or
operating phase
Check gas supply (gas pressure and gas flow switch).
Check flue gas recirculation.
Check for contamination of ionization electrode and burner gauze assembly. Reset the boiler.
F.379
Burner in a
fault state
Flame signal
not present or
insufficient
Check ionization electrode connecting
cable for damage and firm seating.
Check ionization electrode; replace if necessary. Reset the boiler.
F.380
Burner in a
fault state
Flame loss
immediately after
flame formation
(during safety time)
Check gas supply (gas pressure and gas flow switch).
Check balanced flue system for flue gas recirculation.
Check ionization electrode and burner gauze assembly:
Clearance to burner gauze assembly
Contamination on electrode Reset the boiler.
F.381
Burner in a
fault state
Flame loss during
operating phase
Check gas supply (gas pressure and gas flow switch).
Check balanced flue system for flue gas recirculation.
Check ionization electrode and burner gauze assembly:
Clearance to burner gauze assembly.
Contamination on electrode Reset the boiler.
F.446
Burner in a
fault state
Deviation, boiler
supply temperature
sensor/high limit
safety cutout
Check the supply temperature sensor/high limit safety cut-out.
Check plug-in connection and lead to sensor.
Reset the boiler.
F.467
Burner in a
fault state
Gas supply
insufficient
during calibration.
Contaminated or
insufficiently sized
gas line.
Test static gas pressure and gas flow
pressure.
Check that on-site gas line and gas flow
switch are correctly sized.
Visually inspect gas solenoid valve inlet and
strainer on the inlet side for contamination. Reset the boiler.
Note:
Contamination from a brazed gas line, for example,
can block up the gas solenoid valve strainer on the inlet side.
Fault Codes
Fault Codes
28
Displayed
fault code
System
characteristics
Cause
Measures
F.13
Regulates as
if the outside
temperature
were 0°C.
Lead break, outside
temperature sensor
Check the operating mode setting in the commissioning assistant and correct if necessary.
Check outside temperature sensor and connection to sensor (external plug, contacts 1 and 2).
Measure voltage at sensor input on electronics module.
Target value: 3.3V– with sensor disconnected. Replace faulty component if necessary.
F.69
Burner in a
fault state
Ionization current
lies outside the
permissible range
Check ionization electrode:
Check whether insulation block is touching electrode ceramic.
Check gas solenoid valve: Activate
“Minimum heating output” for approx. 4 min in actuator test.
If this causes a fault to occur, replace BCU burner control unit.
In the actuator test, switch from “Minimum heating output” to “Maximum heating output”. ‘
If this fault occurs during modulation, check the intake screen for contamination.
Replace the fan unit if necessary.
F.70
Burner in a
fault state
Internal error burner
control unit
Replace BCU burner control unit:
See page 89.
F.71
Burner in a
fault state
Fan speed too low
Check fan for blockage.
Check the gas type and flue system setting in the commissioning assistant and correct if necessary.
Reset the boiler.
F.72
Burner in a
fault state
Fan idle state not
reached
Reset the boiler.
If fault occurs repeatedly, replace fan unit.
F.73
Burner in a
fault state
Internal
communication error
Reset the boiler.
If fault recurs, replace BCU burner control unit: See page 89.
F.182
No DHW
heating
Short circuit, outlet
temperature sensor
(if installed)
Check outlet temperature sensor (plug X1, cores 13 and 14).
Measure sensor input on electronics module.
Target value: 3.3V– with sensor disconnected
F.183
No DHW
heating
Lead break, outlet
temperature sensor
(if installed)
Check outlet temperature sensor
(plug X1, cores 13 and 14).
F.299
Time/date
incorrect
Real time clock
setting incorrect
Set the time and date.
F.373
Burner in a
fault state
Heat transfer
too low during
calibration
Temperature limiter
has shut down.
Ensure adequate heat transfer.
Check circulation pump for faults, scale or blockages.
Check 3-way diverter valve function in actuator test. Vent the system.
Check function of flow sensor. Reset the boiler.
Note:
Fault messages dependent on boiler equipment level
Refer to the fault code section of the B2HE Service Instructions for
the complete list of fault codes.