Recent content by Andrew S

SOLUTION! Thanks v. much kaos24 - you cracked it! Flow through circuit is fine. Return about 14 degr below flow at cut off. Put batteries back in the thermostat and restored the boiler to automatic, it now happily heats up to the flow temp on the dial. Reading the VRT-360f manual, I...

Did not observe s.5 on startup - it showed up on burner shutdown. Not documented by Vaillant, so might indicate a known problem. Looks like a control system issue so would have thought adjustable parameters in d. series may well be relevant.

We have a Vaillant 828/2E boiler in a building that we are currently renovating. Hot water seems to work fine, but the radiators don't get hot enough to warm the house. There is VRT340f bluetooth controller, but this is not in commission and the boiler currently runs in manual mode (indicated...