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what is a actuator for?

tapping noise coming from actuator heating will not come on can any body tell what this part is for and will this cause my heating not to come on
big g, March 2010
its the motor and wiring to allow the valve to open close.

yes it can stop heating coming on.
what valve is it ? 3 port 2 port etc ?

hi-spec plumbing & heating (essex), March 2010