Just cold water. I have recomissioned the timer unit and run through all the on off times and put water on to constant. We have a large tank which may be part of the problem... I have now noted that the immersion part of the combi heater is working.... we have this set up in a down stairs...
HI. I need a bit advice on the Vaillant 835 bolier. My decorator removed a radiator yesterday and replaced it later on. In order to do this he turned off the bolier and then turned it on again later... and claims he topped up the pressure. However since then we have had an error F.25 message. I...
