If you are replacing the motor, you will need to turn off your central heating system at the fused spur, removing the fuse to prove safe isolation. Open up the wiring centre or junction box that the 2 or 3 port valve is wired to and check for power at the brown and orange wires – you should have no power on the valve motor. If you check when turned on and then remove the fuse and check again then you know it is safe to carry on.
When you remove the pozidrive screw from the silver top (located at end of head) you will immediately see the motor with two blue wires. To the left of the motor is one small pozidrive screw, remove and keep it safe as you will need it to screw back the new motor. Twist the motor slightly to the left to remove the screw holder from the body and pull motor clear, slight resistance from the motor shaft gearing.
Disconnect the two blue wires and using the new motor and plastic electrical twisters included in the box, bare the wires and twist them together replacing the motor in reverse, i.e. push the motor gear shaft into hole in actuator body, twist to align screw hole and re-secure using small screw that you kept safe. Replace the metal head cover and screw and replace fuse in fused spur. Switch on the central heating system and check that when you are calling for heat or hot water that the motor moves – you will see the arm of the valve move as an indication that it is working.
It's long winded I know but I hope this helps. If you are unsure, contact a Gas Safe heating engineer.
- Mark Lewis
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