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I agree with @westward10 when you had the units heads removed did you just visually inspect them or did you give each wire in the interconnects a tug with some needle nose pliers? I have come across them before where the cable looks as if it's terminated properly but is not.
I would try the ones with three cables to them first.
While they are all down a long lead between them and continuity test is next on the list and just work through the circuit until you find the culprit!
I would definitely have a good look at the call point as well, is it one with a test function on it?
I take it it's not one of these?
I would try the ones with three cables to them first.
While they are all down a long lead between them and continuity test is next on the list and just work through the circuit until you find the culprit!
I would definitely have a good look at the call point as well, is it one with a test function on it?
I take it it's not one of these?