57
5784 568 - 03
Vitodens 100-W, B1HA series & B1KA Combi Installation/Service
Troubleshooting
Diagnosis
(continued)
Diagnostics table: Faults with fault display on control unit
(continued)
Fault code in
display window
System
characteristics
*
1
Cause
Corrective measures
e3
Burner in fault mode Fault in safety chain
Check the fixed high limit and connecting
cables (see page 61). Check the control
unit, and replace if required.
e5
Burner blocked
Internal fault
Check the ionization electrode and
connecting cable. Press reset (see page
50).
f0
Burner blocked
Internal fault
Replace the control unit.
f1
Burner in fault mode
Maximum flue gas temperature
exceeded
Check the heating system fill level,
circulation pump and bleed system.
Reset control.
f2
Burner in fault mode
Fixed high limit tripped
Check the heating system water level.
Check the circulation pump. Bleed the
system. Check the fixed high limit and
connecting cables. Reset control.
f3
Burner in fault mode
Flame signal is already present
at burner start
Check the ionization electrode and
connecting cable. Reset control.
f4
Burner in fault mode
No flame signal is present
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).
f8
Burner in fault mode
The combination gas valve
closes too late
Check the gas valve. Check both air and
gas flow paths. Reset control.
f9
Burner in fault mode Blower speed too low at
burner start
Check the blower, check the blower cables
and supply; check the blower control.
Reset control.
fa
Burner in fault mode Blower not at stand-still
Check the blower, blower connecting
cables and blower control. Reset control.
fc
Burner blocked
Electrical fan control (control
unit) faulty
Check fan connecting cable; if required
replace cable or replace control unit. Reset
control.
fd
Burner blocked
Burner control unit fault
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.
ff
Burner blocked
Burner control unit fault
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.
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.
