71
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
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