2.
Check the sensor resistance and
compare actual values with the
curve.
3.
Replace the sensor in case of
severe deviation.
Danger
The boiler temperature sen-
sor is immersed in the heat-
ing water (risk of scalding).
Drain the boiler before repla-
cing the sensor.
Checking the flue gas temperature sensor
The flue gas temperature sensor locks out the boiler when the permissible flue
gas temperature is exceeded. The lockout can be reset no sooner than after 20
minutes by pressing reset
E
.
Note
The equipment will also be locked out again for 20 minutes if the mains power
supply is switched OFF.
Repairs
(cont.)
88
Troubleshooting
56
92
550
GB
Summary of Contents for VITODENS 300 WB3A
Page 10: ...Opening the control unit housing 10 5862 570 GB...
Page 14: ...Closing control unit housing and inserting user interface 14 5862 570 GB...
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