Viessmann B1KA Installation And Service Instructions Manual page 61

Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Diagnosis
(continued)
Diagnostics table: Faults with fault display on control unit (continued)
Fault code in System
display window characteristics*
Burner in fault mode
e3
Burner blocked
e5
Burner blocked
f0
Burner in fault mode
f1
Burner in fault mode
f2
Burner in fault mode
f3
Burner in fault mode
f4
Burner in fault mode
f8
Burner in fault mode
f9
Burner in fault mode
fa
Burner blocked
fc
Burner blocked
fd
Burner blocked
ff
Reset activation (reset burner control unit)
Touch R for approx. 2 sec.
If the fault has been removed, the fault symbol "
disappears and the default display is shown or a further
fault message is displayed.
If the fault persists, the fault message appears again.
Cause
1
Fault in safety chain
Internal fault
Internal fault
Maximum flue gas temperature
exceeded
Fixed high limit tripped
Flame signal is already present
at burner start
No flame signal is present
The combination gas valve
closes too late
Blower speed too low at
burner start
Blower not at stand-still
Electrical fan control (control
unit) faulty
Burner control unit fault
Burner control unit fault

"
Troubleshooting
Corrective measures
Check the fixed high limit and connecting
cables (see page 66). Check the control
unit, and replace if required.
Check the ionization electrode and
connecting cable. Press reset (see page
54).
Replace the control unit.
Check the heating system fill level,
circulation pump and bleed system.
Reset control.
Check the heating system water level.
Check the circulation pump. Bleed the
system. Check the fixed high limit and
connecting cables. Reset control.
Check the ionization electrode and
connecting cable. Reset control.
Check ignition electrodes and wires.
Measure the ionization current, check
the gas pressure, check the gas valve,
ignition, ignition module and condensate
drain. Reset control. Check ignition cable
resistance (4.5K to 5K ohms).
Check the gas valve. Check both air and
gas flow paths. Reset control.
Check the blower, check the blower cables
and supply; check the blower control.
Reset control.
Check the blower, blower connecting
cables and blower control. Reset control.
Check fan connecting cable; if required
replace cable or replace control unit. Reset
control.
Check ignition electrodes and connecting
cables. Check whether a strong
interference (EMC) field exists near the
equipment (correct if applicable). Reset
control. Replace control unit if the fault
persists.
Check ignition electrodes and connecting
cables. Check whether a strong interference
(EMC) field exists near the equipment
(correct if applicable). Reset control.
Replace control unit if the fault persists.
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