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11. Boiler shuts off and goes into anti cycling mode (I am not sure whether this is a specified time or not) but it seems very short and the boiler lights up for only a very short time, seconds rather than minutes some times, before returning to anti cycling mode. Is it possible to extend the...

When I had the boiler installed I had no idea how it worked and what was supposed to happen. I have had to learn what is normal from scratch. It would have been useful to have a description of how the boiler should be working normally so this is my attempt. It could be used by people trying to...

How it works? Vaillant 400 series boiler. I cannot find any yardsticks against which I can measure the function of my boiler. I have as an exercise compiled the functions as they take place on my boiler to see if they are what I should expect. I expect to refine this as a result of any...

I have a Vaillant 400 series boiler running on an open vent system with 8 8 rads running of it. When it starts it ingnites and burns for about 39sec Then it goes out and waits for ten minutes with all symbols displayed i.e. burner pump, gas valve, circulating pump etc. After this period...

I am having similar problems to this. I have an open vent system with 8 rads running of it. When it starts it ingnites and burns for about 39sec Then it goes out and waits for ten minutes with all symbols displayed i.e. burner pump, gas valve, circulating pump etc. After this period it...