60
Displayed fault
code
System characteristics
Cause
Measures
69
Burner in a fault state
Ionisation current lies out-
side the permissible range
Check ionisation electrode for the
following:
■
Check whether insulation block is
touching electrode ceramic.
■
To check the gas solenoid valve:
In the service menu under "b.6",
set the burner output to the lower
heating output for approx. 4 min.
If the fault occurs, replace the
HBMU heat management unit.
See chapter "Replacing the
HBMU heat management unit".
■
In the service menu under "b.6",
switch the burner output from the
lower to the upper heating out-
put. If this fault occurs during
modulation, check the inlet
strainer for dirt. Replace the fan
unit if necessary.
70
Burner in a fault state
HBMU heat management
unit internal fault
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
71
Burner in a fault state
Fan speed too low
■
Check fan for blockage.
■
Check setting for gas type and
flue system.
Reset the appliance.
73
Burner in a fault state
Internal communication
error
Reset the appliance.
If the fault occurs repeatedly, re-
place the HBMU heat management
unit. See chapter "Replacing the
HBMU heat management unit".
74
Burner locked out.
Internal circulation pump off.
No central heating and no
DHW heating
System pressure too low
Top up with water.
Vent the system.
If the fault occurs repeatedly:
■
Check system pressure sensor
with external pressure gauge.
■
Check diaphragm expansion
vessel pre-charge pressure.
■
Check settings for set system
pressure and range.
77
Burner in a fault state
HBMU heat management
unit data memory
Reset the appliance.
If the fault occurs repeatedly, re-
place the HBMU heat management
unit. See chapter "Replacing the
HBMU heat management unit".
89
No central heating and no
DHW heating
Internal circulation pump
blocked
Check circulation pump. Replace if
necessary.
91
Function of affected exten-
sion in emergency mode
DIO electronics module
communication error
Check connections to DIO elec-
tronics module and connection to
HBMU heat management unit.
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 ...