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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Displayed
fault code
System characteristics
Cause
Measures
F.62
Burner in a fault state
High limit safety cut-
out has responded.
Check heating system fill level.
Check pre-charge pressure in diaphragm expansion
tank. Adjust to required system pressure.
Check whether flow rate is sufficient (flow sensor
and circulation pump).
Check 3-way diverter valve function in actuator test.
Vent the system.
Reset the boiler.
F.63
Burner in a fault state
Flue gas temperature
limiter has responded.
Check heating system fill level.
Check pre-charge pressure in diaphragm expansion
tank. Adjust to required system pressure.
Check whether flow rate is sufficient (flow sensor
and circulation pump).
Check 3-way diverter valve function in actuator test.
Vent the system.
Reset the boiler once the flue system has cooled down.
F.67
Burner in a fault state
Ionization current
lies outside the
permissible range
Check gas supply (gas pressure and gas flow switch),
check gas solenoid valve and inlet strainer.
Check ionization electrode:
Clearance to flame body assembly.
Check electrode/flame body assembly for
contamination.
If specified measures don’t help, replace fan unit.
Reset the boiler.
F.68
Burner in a fault state
Flame signal is
already present at
burner start.
Close the gas shut-off valve. Remove connecting cable
of the ionization electrode. Reset the boiler.
If the fault persists, replace BCU burner control unit:
See page 89.
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.
Содержание B1HE Series
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