Extra wire causing havoc! Help

[matt1e]

Hi matt,

problem not resolved yet. Sparky came and rechecked all the wiring again. He worked out with his clip on meter the amp going to the flow switch was 0.1amp without relay being engaged and 0.2 amp when relay pulled in.Put the new flow switch on ( third one). It seemed to be working fine for some time but the relay was already starting to latch whenever hot water was turned on but would release after a long while i.e about 5-7 min. Within 24 hrs the relay is not disengaging at all until boiler is switched off and on.

Every time I turn the hot water on, I have to go out and switch the boiler on and off to disengage the relay and get the heating back on as CH pump does not start until relay disengages.
Came home today to find the relay already engaged with no CH although I disengaged it in the morning and went probaby when boiler must have fired to top up it reserve during the day.
Now I am not sure whether the other two flow switches have really gone or not (Something you mentioned right in the begining)

Sparky thinks its one of the stats which is gone but not the relay tank stat but the one next to it( I forgot the name).

I think we are still missing a wire from the relay back to one of these stats
i.e RTS or the other one which lie directly behind the timer where I was fiddling before it got pulled out. He removed it alltogether and went by the diagram.

Would be intrested to know what you think. Your help is greatly appreciated and I keep giving your ideas to sparky as well.

Thanks

Hi vhooda
I will have a quick read and give you some pointers but i'm not long in from work and about to go out so will be later or tommorrow

but heres a couple for starters

the 0.2A current you mention is around what you would expect the running current of a domestic circulator (pump) to be
check that he has not wired the pump into the wrong terminal of the relay base and put it in series with the flow switch
if the relay is latching but disengaging when the power is removed then its not sticking, its powered, your sparky needs to find out where the voltage on the relay coil is coming from

Matt

 

[bhm1712]

Get a proper heating controls engineer not an electrician who obviously doesnt know what he is doing. A decent engineer would have had this up and running within 30 mins. Central heating wiring is as straight forward as it gets!!!

pictures would help!!!