Search results

My troublesome 4 year old Vaillant EcoTec 831 has now developed another problem that has me stumped. The boiler stays firing in CH mode even when the thermostat isn't calling for heat, resulting in things getting a bit warm in the house. These are the things checked so far: 1. Thermostat...

Hi, We had an Ecotec 831 installed around 4 years ago, to replace an ancient wall mounted boiler. The improvement in efficiency (and much reduced gas bill) was welcome, but the thing has been very unreliable, with the dreaded F75 fault being a very regular occurrence each winter, and...