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No Hot water Vaillant GB 242 EH?

Iv'e just had the main circuit board and spark transformer replaced on my Vaillant GB 242 EH combi to correct a failure to ignite. It seemed to do the job as the central heating seems to work but the Hot water out of the tap is barely warm. Any suggestions?
Rob G, April 2008
what is the divertor valve doing? Is it moving over and hitting the microswitch?

J, April 2008
link Click here to see other fixes for Vaillant GB 242 EH.