We have a Vaillant Turbomax Pro combi boiler. I believe it's only about 4 years old.
My hot water temp has dropped dramatically! I like very hot water, so my temp gage on my combi boiler is at almost max, then hot water taps are very hot normally, but suddenly the past few days the water seems to have dropped to just over luke warm. We noticed the pressure gage had dropped to nothing, and today found the filling loop to top it up but it doesn't seem to have increased the temp of the water at all. The heating is ok, all rediators toasty hot, (except one that we don't ever use, but having tried it we can't get that hot either)
Can anyone advise what's wrond with the hot water? Hopefully something that won't cost us a fortune!
Thanks

Karen, November 2007

not sure

me, March 2010

when your heating is switched off does one of your central heating pipes get hot when you run hot water try this and tell me

gedodonnell, November 2007

you will need to test the hot water thermister to see if this is causing your problem...usually this is the first port of call then to gas rates and modulating gas valve rates ..you can test the thermister with a cup of hot water and a multi meter

gedodonnell, November 2007