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what and where is acuator?

fitting a 2 port motorised valve for a potterton profile 50 what and where is a actuator
shelly., March 2009
thank you neil fitted but having problems fitted new pump and valve but boiler did not light any ideas.

shelly., March 2009
the actuator is the electrical part of the valve you are fitting

neil, March 2009
link Click here to see other fixes for Potterton.