69
Displayed fault
code
System characteristics
Cause
Measures
102
No internet connection
Error with communication
module
Check cables and plug-in connec-
tions between heat management
unit and communication module.
103
Control mode
Internal communication
error, programming unit
Check cables and plug-in connec-
tions between heat management
unit and HMI programming unit.
104
Depending on configuration
of EM-EA1 extension (DIO
electronics module)
External fault message in-
put active
Check connected external device.
142
Burner in a fault state
Communication restriction
on CAN bus. INR
Check the fan unit for correct func-
tion. For this, check the stepper
motor of the fan unit (reference run
with mains ON).
If the fault persists, check the plug-
in connections and cables of the
CAN bus.
Check further CAN bus subscrib-
ers. If fault occurs repeatedly, re-
place fan unit.
160
Burner in a fault state
Communication error,
CAN bus
Check connection to CAN bus sub-
scribers (INR, HBMU).
Check connections to external
CAN bus subscribers.
161
Burner in a fault state
HBMU heat management
unit data memory access
fault
Reset the appliance.
If the fault occurs repeatedly, re-
place the HBMU heat management
unit. See chapter "Replacing the
HBMU heat management unit".
163
Burner in a fault state
Checksum error, data
memory access, HBMU
heat management unit
Reset the appliance.
If the fault occurs repeatedly, re-
place the HBMU heat management
unit. See chapter "Replacing the
HBMU heat management unit".
182
No DHW heating
Short circuit, outlet tem-
perature sensor (if instal-
led)
Check outlet temperature sensor
(plug X7, cores 3 and 4). Measure
sensor input on HBMU heat man-
agement unit. Set value: 3.3 V
–
with sensor disconnected
183
No DHW heating
Lead break, outlet temper-
ature sensor (if installed)
Check outlet temperature sensor
(plug X7, cores 3 and 4).
184
Burner in a fault state
Short circuit, flow temper-
ature sensor/high limit
safety cut-out
Check the flow temperature sen-
sor/high limit safety cut-out.
Check sensor lead. Replace faulty
component if required.
Reset the appliance.
185
Burner in a fault state
Lead break, flow tempera-
ture sensor/high limit safe-
ty cut-out
Check the flow temperature sen-
sor/high limit safety cut-out. Re-
place faulty component if required.
Reset the appliance.
Troubleshooting
Fault messages
(cont.)
6167586
Diagnosis
