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Vaillant 630 error f 85?

How to fix Vaillant error f 85 ?

Michal
September 2015
VaillantHeating, Home Heating Systems
Well - I quickly found this...
F.85 Flow and return temperature sensors incorrectly fitted
You might do well to talk to the person who fitted them
Or call in a boiler engineer perhaps.

Good Luck...
September 2015
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