How can I fix my potterton 10/16?

if you have fitted a new mercury expansion switch then the new point of call has to be the gas valve as thats the next thing to operate. If you are handy with a volt meter check for voltage on the solanoid on the gas valve or safer still check the resistance of the solanoid with the power off. (high readings or open circuit and its knackered)

Paul the gas man
May 2006