Operating instructions

Check the outlet temperature s ensor
1. Pull the l eads off the outlet tem-
perature sensor A.
2. Check the sensor resistance and
compare it wi th the curve.
3. Repl ace the sensor in ca ses of
severe deviation.
Danger
The outlet temperature sen-
sor is immersed in the DHW
(risk of scalding).
Drain the second ary side of
the boiler before replacing
the sensor.
Checking the flue gas temperature sensor
The flue gas temperature sensor locks out the boiler when the permissible flue
gas temperatur e is exceeded. R eset the interlo ck after the flue ga s system has
cooled down by pr essing the rese t button "E".
Repairs (cont.)
82
Troubleshooting
5692 619 GB