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Thermal Coupler?

I have fitted a new thermal coupler to my boiler which I have done a number of times over the years. However this time the pilot light won't stay on when I release the valve after lighting it. What else could be wrong?
Phil Williams, January 2014
Make sure point is heating up of thermo couple hold for 2 mints ,if does not stay on after few time ,change gas valve

ltd, January 2014