Vaillant eco TEC Pro

Joined
1 Sep 2004
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United Kingdom
Morning,

Bit stumped as there does not appear to be an issue so I must be missing the obvious here.

I have the above combi and the hot water is fine, the central heating though only gets warm not hot.

There are no error codes and I have checked the remote controller and used the overide funtion and this is all fine. On the screen have set the temperature to 65 degrees for the central heating but when the boiler fires it only shows 40 degrees and does not seem to want to get to temperature, the flame symbol is lit and the radiator sign flashed and the unit displays code S04 so all appears fine.

I tried setting the hot water to 65 degrees too and this works fine (then I turned it down as it was scaldingly hot.)

Any suggestions before I go any further.
 
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