70
Displayed fault
code
System characteristics
Cause
Measures
468
Burner in a fault state
Ionisation current too high
during calibration
Check gap between ionisation
electrode and burner gauze as-
sembly.
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.
471
No heat demand
System pressure sensor
not available, lead break
or short circuit
■
Check system pressure sensor
(plug
aND
).
■
Check lead and plug-in connec-
tion.
■
Measure the supply voltage to
the sensor to see if it is 5 V
–
.
474
Burner in a fault state
Error in scheduled pro-
gram run monitoring
Reset the appliance.
If the fault occurs repeatedly, re-
place the HBMU heat management
unit. See chapter "Replacing the
HBMU heat management unit".
517
Normal operation, remote
control unit not functioning
Lead break, PlusBus ca-
ble, incorrect appliance
address set, remote con-
trol faulty
■
Check setting in the commission-
ing assistant and correct as nec-
essary.
■
Check remote control cable.
■
Check remote control subscriber
number. Replace faulty remote
control if applicable.
527, 528
Burner in a fault state
Incorrect HBMU heat
management unit parame-
ter set
Overwrite (flash) the HBMU heat
management unit with the correct
parameter set.
Troubleshooting
Fault messages
(cont.)
6173886
Diagnosis
Содержание B0KA
Страница 14: ...14 1 4 5 3 2 Fig 4 Installation sequence Removing the boiler from the packaging 6173886 Installation ...
Страница 28: ...28 1 2 Fig 20 Installation sequence Fitting the front panel 6173886 Installation ...
Страница 78: ...78 1 2 3 6 4 5 7 Fig 42 Troubleshooting Repairs cont 6173886 Diagnosis ...