Checking The Temperature Sensors - Viessmann Vitodens 100-W B1HF Series Installation And Service Instructions Manual

Repairs
(cont.)
Note
Use new gaskets and, if required, new locking ring
connections when assembling.
Internal gasket diameter:
Gas connection Ø 18.5 mm
■
Connections on the heating water side Ø 17.0 mm
■
Gaskets and locking ring connections are available as
spare parts (if required).

Checking the temperature sensors

4
2
B
1 3
1 2
3 4
A
Fig. 43
Heat generator circuit flow temperature sensor
(dual sensor)
1. Check the leads and plugs of flow temperature
sensors .
A
2. Disconnect the leads from flow temperature sen-
sors A .
Note
When carrying out any work on gas connection fittings,
counterhold with a suitable tool. Never transfer any
forces to the internal components.
Danger
Escaping gas leads to a risk of explosion.
Check all connections on the gas side (also
inside the appliance) for tightness.
C
Troubleshooting
81