I hold potterton performa24 boiler, when I turn the switch to the right for hot hose the C/H comes on as capably the C/H should not come on when I select the hot...
the C/H should not come on when I select the hot water merely
I am a British Gas enginner and see this alot. The problem will most probably lie beside the diverter valve (or some culture call it a 3-way valve). As the hot wet that is expected to come out of the taps seep through into the heating circuit.
Approx 45-60mins repair for a obedient engineer.
You do not specify what sort of programmer that you hold, so here's two guesses as to what is happening to you. Personally, I would try the 3-way spout first.
PROGRAMMER
On many programmers nearby is a means of linking the CH and HW systems. In most cases you stipulation to remove the device from the wall (turm power off first).
If it's a powered programmer (such as a Miniminder) then you'll find a small plastic intertwine on the back which have to be re-positioned.
On some electronic ones there is a switch on the backbone which controls the HW/CH relationship.
THREE-WAY VALVE
If this situation has only just happened as a "fault" later the most likely problem is your 3-way spigot. This is the small box in your airing cupboard that have three large pipes going contained by to it. One of these pipes is the hot water nurture from your boiler, one of them goes to the HW cylinder, the other go to your CH system.
The three-way valve is responsible for switching the flow of hose down according to commands from the programmer. Get someone to operate the programmer contained by various combinations of HW and CH while you listen meticulously to the noises that the stopcock makes. Bear within mind that it takes a few second to operate. These things can stick, leak or even the motor pack up.
If it's the motor that's slipshod then you're contained by luck because they are fairly cheap and you don't enjoy to disconnect any pipes or drain the system to replace it. Just undo the fitting screw and it lifts past its sell-by date. While the motor is off you can question paper the valve by wiggle the brass stem with your fingers (or pliers) and see if it does the business for you.
If it's the actual stopcock itself that's failed later you'll have to drain the system and help yourself to it out.
Answers: This boiler is a combi so last 3 answers do not apply to this boiler. Fault could be beside the hot water switch sticking on due to a dampen leak corroding the switch. This a adjectives fault on this model, it cause the boiler to overheat and pump this heat around the radiators.
The flow of hose down through the C/H should be controlled by a motorised valve somewhere. Maybe it is stuck or burned out?