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I replaced the wiring connections one at a time, so they can't be in the wrong place. I have also just checked with the wiring diagram. There is a + - adjuster on top of the thermostat. What is it for ? There are also two small grub screws underneath which operate the microswitches, could...

This boiler has had a new thermostat fitted and if I turn the dial much further than 2, the boiler cuts out, pump stops. After about 3 - 5 minutes, it starts up again. If it is left on the number 2 setting, it operates correctly. Anyone know what is wrong ?