This was a repair I did on a Vaillant ECOTEC Plus 837 this week in Sheffield S11. I was called to fix an issue where the boiler had just suddenly gone off displaying the F.28 fault code. The boiler would not fire up when reset.
This particular fault, or at least the cause of it seems to be quite common on the second generation ecotec plus 837 models manufactured from 2012 onwards. Actually the F.28 fault in general is not uncommon on the new versions of the Vaillant ecotec Plus and Pro models.
The cause of the fault on this particular boiler turned out to be a faulty gas valve. This is the exact same fault as the and 837 I repaired a few weeks earlier. I have found that the F.28 fault usually starts out intermittently which seems to be the case with the Pro 24 and 28 boilers.
The solution for this boiler was to replace the gas valve and check the rest of the boiler over. The replacement gas valve usually needs a bit of adjustment which is only possible with the assistance of a flue gas analyser. Gas valves on most modern boilers are adjustable but non serviceable components and cannot typically be repaired.
I was able to repair the F.28 error code on this boiler with one visit. I cannot always guarantee such a quick response, but I was actually able to repair this boiler on the same day the customer called me. They called in the morning and I was able to repair the boiler later in the afternoon.
Areas where I can repair your Vaillant ecotec plus 837 combi boiler
I cover a large part of South Yorkshire including most of Sheffield, Rotherham and Barnsley. I also cover a small part of Doncaster.
Sheffield:
I cover most of Sheffield including central Sheffield, Chapeltown, Ecclesfield, Grenoside, High Green, Oughtibridge, Thurgoland, Wortley, Aston, Aughton, Swallownest, Todwick, Hillsborough and Stannington.
Rotherham:
I cover the whole area of Rotherham including central Rotherham, Brinsworth, Catcliffe, Canklow, Masbrough, Treeton, Whiston, Greasbrough, Kimberworth, Thorpe Hesley, Rawmarsh, Wentworth, Bolton-on-Dearne, Goldthorpe, Thurnscoe, Wath-on-Dearne, Mexborough, Swinton, Kilnhurst, Hooton Roberts, Ravenfield, Thrybergh, Bramley, Hellaby, Maltby, Thurcroft, Wickersley and Braithwell.
Barnsley:
I cover most of Barnsley including central Barnsley, Birdwell, Stairfoot, Worsborough, Kendray, Ardsley, Athersley, Monk Bretton, Lundwood, Royston, Brierley, Cudworth, Cortonwood, Great Houghton, Shafton, South Hiendley, Brampton, Darfield, Wombwell, Hemingfield, Elsecar, Hoyland, Jump, Barugh Green, Cawthorne, Darton, Dodworth, Gawber, Mapplewell, Pogmoor, Staincross, Wilthorpe, Worsbrough, Thurnscoe and Tankersley.
Doncaster:
I cover a small part of Doncaster including central Adwick, Conisborough, Edlington, Warmsworth and Mexborough.