Faults Without A Fault Display - Viessmann Vitotronic 11 CC1E Installation And Service Instructions Manual

Troubleshooting
Fault messages
(cont.)
Cause
LON subscriber fault

Faults without a fault display

Display off
■
System cold
■
Cause
Fuse F2 has tripped.
Checking temperature sensors
Boiler, cylinder, flow and buffer temperature sensors; temperature sensor for low loss header;
return temperature sensor (Therm-Control sensor)
Note
The return temperature sensor can be used as a con-
tact or immersion temperature sensor.
Viessmann NTC 10 k (blue ID label)
Ω
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 35
Flue gas temperature sensor
When a specified limit is reached (see parameter "1F"
in the "Boiler" group), a service display appears.
98
70 90 110
Measure
Check LON communication module and replace if re-
■
quired.
Check the LON subscribers.
■
Check the LON parameters.
■
Update the LON subscriber list.
■
Measure
Check the power consumption.
■
Check the pump and pump connections.
■
Replace fuse F2: See connection and wiring diagram
■
1. Pull out corresponding plug.
2. Check the sensor resistance and compare it to the
curve.
3. In the case of severe deviation, check sensor
installation and replace the sensor if required.