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Troubleshooting
Fault messages
(cont.)
Displayed fault
System characteristics
code
F.357
Burner in a fault state
F.359
Burner in a fault state
F.361
Burner in a fault state
F.366, F.367
Burner in a fault state
86
Cause
Insufficient gas supply
No ignition spark
Flame signal is not
present or insufficient at
burner start.
Gas valve electricity sup-
ply does not turn off.
Measures
Check that the gas shut-off valve
■
is open.
Optically check input-side screen
■
in the gas solenoid valve for con-
tamination.
Test static gas pressure and gas
■
flow pressure.
Check that on-site gas line and
■
gas flow switch are correctly
sized.
Note
If the building pressure regulator
has a leak, you may notice rising
pressure when the burner is idle.
When the system is restarted, the
gas flow switch may trip.
If the static pressure doesn't drop,
check cable to the fan unit. Check
whether the coil resistance at the
fuel valve is approx. 4 k
Ω
contact 2 and 4).
Check the ignition electrode for
damaged insulation.
Reset the appliance.
Check whether the ignition elec-
■
trode insulation is damaged.
Check for a voltage of 230 V∼ at
■
the ignition module during the ig-
nition phase. If not, replace the
BCU burner control unit.
If 230 V~ is present at the igni-
■
tion module but there is still a
fault, replace the ignition module.
Check connection cables and
■
leads from ignition module and
ignition electrode.
Reset the appliance.
Check ionisation electrode and
connecting cable. Check plug-in
connections for loose contacts.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
air. Check the installation room and
flue system for causes of the de-
posits. For example: Laundry de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (chimney).
Reset the appliance.
Replace BCU burner control unit:
See page 100.
(plug 35,
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