Ideal Boiler/Sunvic vale problem

[callumjack]

Hi

Have a problem my plumber isnt sure of !!

Have an ideal ff50 minimiser boiler connected to a megaflow hw cylinder. It is controlled by an acl drayton programmer, but occasionally when the kids have had a bath and the boiler needs to operate, the pump will keep running after the water is hot and will continually fire up the boiler even when the programmer is turned off !. It will continue to do this and will only stop if i turn off all the electrics and leave it overnight and then turn it all back on again

The central heating is controlled by a room stat and always works fine and under control

After the pump is a sunvic 2 way valve which its self is connected to a cylinder stat and after that a honeywell 2 way valve.

my plumber says the sunvic could be faulty but it never seems to be faulty when he is there !!

any thoughts anyone--apologies for poor non technical description above !!

 

[Slugbabydotcom]

my plumber says the sunvic could be faulty but it never seems to be faulty when he is there !!

any thoughts anyone-

A case of plumbers / mechanics law.
Dont know if I am coining a phrase or creating it here but my definition of it is :-
Any noise or event that you would wish your plumber or mechanic to witness will not happen while he is there waiting for it to happen!!

As for solving the problem well thats just a case of catching it when it goes wrong to search for the source of the live connection that is causing your boiler to run when it shouldn't.
OR
The expensive way is to renew everything that it might be until the problem ceases and if that doesnt work its a wiring fault.

If you were to ask me where I would start looking first I would say at the programmer