Welcome, my name is XXXXX XXXXX X will do my best to help you with your issue.There are several possible culprits
The most common would be a weak thermopile. The thermopile is one of the flame sensors in the pilot flame. It's what generates all the voltage to power the gas control valve which turns the burner on. If it gets weak it will no longer generate enough power to open the gas valve
Next most likely is a defective wall switch
The less likely possibilities are a faulty gas control valve or possibly a clogged main burner orifice
Yes, we replaced the thermopile last year and the unit worked this year and only recently I cannot get the flame push button on the wall control to make contact with the internal points to fire up the base plate. I think I need a new control unit where do you get a unit at a price that is most inexpensive?
This pricey switch is not available in many places this is the only vendor I could findhttp://www.qualitydist.net/htl-wsk-mlt-htl.html
Rick, not a much help but appreciate your input.