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what is wrong with my Vaillant Sonnet 18?

The hot water is working fine but the heating system is not working.
Can you tell me why, as it is a very old but reliable boiler and we never had any problems except British Gas keep telling us to replace it due to it's age....which we are aware of but it has been very reliable all those years and we are planning on replacing it this summer but we fill the problem might be something simple as we are getting hot water.
Mrs D. Sylvan, December 2009
room stat or programmer fault (clock) link them out. no cost involved an if it works everyone is happy, o link out= put the one that says switch/ heating on or on a room stat usually the one numbered up 3 straight in the live. for god sakes tho power off!! before you do!! hope this helps

mac, December 2009
link Click here to see other fixes for Vaillant.