- Messages
- 2,141
can this fault also so be due to ignition leadSee above post again Navi, my strike throughs are like your boilers... unpredictable. It sounds like everything has been done with regards to your gas supply, F28 error includes gas + ignition so that side of things require further investigation imo hence recommending the igniter swap out. It may at this point ask Vaillant to participate again IF parts are required.