68
Any fault message facility connected will be switched
off.
If an acknowledged fault is not remedied, the fault
message will be redisplayed the following day and the
fault message facility restarted.
Calling up acknowledged faults
Hold down OK for approx. 4 s.
The 10 most recent faults (including those remedied)
are saved and can be called up.
Calling up fault codes from the fault memory (fault
history)
The 10 most recent faults (including those remedied)
are saved and can be called up.
Faults are sorted by date.
1. Press OK and å simultaneously for approx. 4 s.
2. Select "ã". Enable fault history with OK.
3. Use / to select fault messages.
Deleting the fault history
While the list is displayed, press OK until flashes.
Confirm with OK.
Fault codes
Faults without fault display
Fault Cause of fault Measure
Burner blocked; 3 is displayed in code 38
(code 2/boiler)
The combustion chamber pres-
sure switch or water pressure
switch has responded or there
is a break in the cable leading
to the combustion chamber
pressure switch or water pres-
sure switch.
Check the combustion chamber
pressure switch, water pressure
switch, connection hose, burner
and flue system; see page 16.
Reset the combustion chamber
pressure switch.
Inform Technical Service.
Fault code dis-
played
System characteristics Cause Measures
10 Regulates as if the outside
temperature were 0 °C.
Short circuit, outside tem-
perature sensor
Check outside temperature sensor
(see page 75).
18 Regulates as if the outside
temperature were 0 °C.
Lead break, outside tem-
perature sensor
Check outside temperature sensor
(see page 75).
19 Regulates as if the outside
temperature were 0 °C.
Configuration fault Observe code 2A
Replace temperature sensor.
20 Regulates without flow tem-
perature sensor (low loss
header)
Short circuit, system flow
temperature sensor
Check the low loss header sensor
28 Regulates without flow tem-
perature sensor (low loss
header)
Lead break, system flow
temperature sensor
Check the low loss header sensor
If no low loss header sensor is
connected, set code 52:0.
30 Burner blocked Short circuit, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 76)
38 Burner blocked Lead break, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 76)
40 Mixer is being closed. Short circuit, flow temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Check flow temperature sensor.
44 Mixer is being closed. Short circuit, flow temper-
ature sensor, heating cir-
cuit 3 (with mixer)
Check flow temperature sensor.
Troubleshooting
Fault display (cont.)
5839829
Diagnosis
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