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Vailliant Turbomax plus 824/2e 828/2e Problems?

i have a Turbo max plus combi 824/2e / 282/2e boiler installed in my house (circa 6yrs old), which i'm experiencing problems with.
With heating turned on the follwoing issues occur
- radiators are all ok
- hot water is cool / cold from taps
- boiler indictaed pressure rises to maximum - 3 on gauge
- timed heating does not appear to work or control boiler
- If house thermostat is turned down heating / boiler does not go off.

With heating turned off
- hot water works ok at all taps
- indicated pressure is ok

Your assistance or ideas would be much appreciated.
Thanks
Mick, November 2008
diverter valve, very easy to change all done from the front in about 20 mins and around £90 from any parts supplier......oooh remember to isolate cold mains and flow /return and drain boiler

mark the gay boiler man, November 2008