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Thanks Tony. You are about right with that cost, which is why I am loath to call them back! Is cleaning the sensor a job I could do myself or would I be best to get an engineer in to do it? We have not had any F fault codes reported.

Our Vaillant Ecotec plus boiler keeps on displaying code S97 (waterpressure sensor check running, demand for heating blocked) when in heating mode. Water pressure is fine. It has been doing this intermittantly for a month or so now. Had engineers out to it and they said it was a blockage in...