Vaillant cvw gb 221H ch overheat thermostat wrong screw thread

Jan 20, 2012
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Hi Not to sure what to do.This is my first forum I have ever been on.

My Vaillant CVW 221 H Central heating overheat thermostat/ temprature regulator packed in,So I got a replacement but it has a smaller screw thread and it won't fit .The part number ( 101462 ) on the sealed packet is, which according to replacement parts web sites is correct, but on my boiler the threaded hole is bigger .Question does anybody know if there are two different sizes or has had a similer problem.

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