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My Vaillant Thermocompact boiler wont ignite?

My Vaillant Thermocompact boiler wont ignite and I keep getting the error message 5.33. The temp is stuck on 18C.
Mario Michael, March 2008
sounds like a sensor error the code needs to checked to the manufacturers instructions in fault codes to be exact

paul, March 2008
link Click here to see other fixes for Vaillant Thermocompact.