The indicator should be showing M (mid position) and the boiler should light.Points 7 to 9 completed. The actuator arm has moved right across and the indicator shows H, but the boiler has not lit.
Did you check that the cream terminal went live when stat turned up and dead when stat turned down?Disconnected white & grey, CH stat turned up, Cream was now live & I have connected white to this terminal.
That's OKNow have orange & grey wires not connected.
That's wrong. The valve should go to mid-position and boiler light. When the valve is in mid-position, the boiler is lit via the HW thermostat, which we know is OK.Boiler not responding. Actuator moved to H position.
Curiouser and curiouser!Cream terminal is live regardless of whether stat is up or down.
No power to yellow terminal whether HW is turned off or on
Now check the white terminal. Does it have 240V when the HW stat is turned down or HW is OFF and 0V when HW is ON and HW stat turned up? If so that is the correct terminal for the grey wire.Does the Yellow terminal respond to the CH stat turned up and down when CH is ON? If so, that is the correct terminal for the valve White wire.
No reponse from yellow terminal when CH stat up or down
No. What I should have said was disconnect the white wire first.Should I have turned off power to reset actuator before doing your latest test? Actuator is still over to CH!
Presumably CH was ON?No response from yellow terminal when CH stat up or down
That's not quite what I asked for. You should get the following:No voltage when HW on stat is down/off or when switched on & up.Now check the white terminal. Does it have 240V when the HW stat is turned down or HW is OFF and 0V when HW is ON and HW stat turned up? If so that is the correct terminal for the grey wire.
We need to positively identify what the cream and yellow terminals do.CH was switched on when I checked yellow
To confirm, there was no power to the white terminal during any of the 4 combinations.
Is the junction box part of the programmer or separate from it? If part, I only need a pic of the junction box. But is separate, I need a pic of both junction box and terminals within the programmer.The actuator is wired to a connecting block ( as in my diagram) which in turn goes to a junction box. Which do you need to see?
That is excessive. Hidden wires make life difficult, but you should be able to produce a circuit diagram in under an hour.spent six hours trying to figure out the wiring of my system!
Yes,that is the real problem.He now seems unable to explain why a terminal remains live on the connecting block despite everything being switch off.
I hadn't thought of a frost stat.He has narrowed down to a potentially faulty frost stat.
....
He is due to return to fit a new frost stat to either solve or eliminate this from his investigation.
If the stat is external to the boiler, there is no need to replace it to check if it is faulty. All you have to do is disconnect it and see if the problem goes away!!
I suggested that & reply was that the frost stat may be part of a circuit & disconnecting it wouldn't necessarly show anything!
That's cobblers.I suggested that & reply was that the frost stat may be part of a circuit & disconnecting it wouldn't necessarily show anything!If the stat is external to the boiler, there is no need to replace it to check if it is faulty. All you have to do is disconnect it and see if the problem goes away!!
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