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Help f75 error ?

Help I have f75 error no heating or hot water Vaillant 837 boiler
Sam h, January 2014
Potential fault with the central heating sensor/pump. After re-pressuring and resetting, run the boiler, if the pump can be heard running on/off and f75 persists, change the c/h sensor

Carefree, January 2014
No water pressure in boiler ,fill water with two nobs under the boiler open two and close when filled

ltd, January 2014
link Click here to see other fixes for Vaillant.