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Fault messages
(cont.)
Displayed fault
System characteristics
code
F.468
Burner in a fault state
F.471
No heat demand
F.473
No heat demand
F.474
Burner in a fault state
F.517
Control mode, remote control
unit not functioning
F.527
Burner in a fault state
F.528
Burner in a fault state
F.530
Solar function limited
Cause
Ionisation current too high
during calibration
System pressure sensor
not available, lead break
or short circuit
HMU heat management
unit communication error
Error in scheduled pro-
gram run monitoring
Lead break, PlusBus ca-
ble, incorrect appliance
address set, remote con-
trol faulty
Incorrect parameter set,
HMU heat management
unit
Incorrect parameter set,
BCU burner control unit
Sensor value not available
or lead break of one or
more sensors/missing
sensor(s)
Troubleshooting
Measures
Check gap between ionisation
electrode and burner gauze as-
sembly.
Heat generator installation
and service instructions
Check whether there is a lot of
dust in the ventilation air (e.g. from
construction work).
Reset the appliance.
Note
Deposits on the electrodes indicate
foreign bodies in the ventilation 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).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Check system pressure sensor
■
(plug
).
aND
Check lead and plug-in connec-
■
tion.
Measure, to see if supply voltage
■
to sensor is 5 V
.
–
Check connecting cable between
burner control unit and HMU heat
management unit.
Reset the appliance.
If fault recurs, replace BCU burner
control unit: See page 100.
Check setting in commissioning
■
assistant.
Check remote control cable.
■
Check remote control subscriber
■
number. Replace faulty remote
control if applicable.
Overwrite (flash) the HMU heat
management unit with the correct
parameter set: See page 100.
Overwrite (flash) the BCU burner
control unit with the correct param-
eter set: See page 100.
Check sensor(s), or connect miss-
ing sensor(s) to SDIO electronics
module.
93
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