SOURCE: vaillant 831 combi boiler timer help
check to see the time clock is set with the clock symbol. there are three settings on analog clocks I , O and clock the I setting is constant running, the O setting is off and the clock setting is timer.
also try setting the thermostat up higher to see if the boiler fires.
SOURCE: brand new valiant condensing boiler installed will not work
Valliant boilers have software that can be used to diagnose the unit. The software can be purchased at the plumbing supply house that the boiler was purchased from. You can also get tech. service by email as well. It sound like there is an issue with the electrical controls with it. Or the controls were wired wrong.
Technical enquiries 01634 292392 or [email protected]
SOURCE: vaillant eco tec pro 28 every time cold tap is
try reducing water pressure to cold tap and see what happens
SOURCE: code f28 what isit?
According to the user's guide, the fault code means that the boiler failed to start after 5 attempts. Here is the manual where I got the information. I would confirm the codes with your particular model. I am presuming that the codes would be standard for all their models. Source(s): http://www.vaillant.co.uk/stepone2/data/…
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