Hi i'm new to the site and looking for help with my 4 yr old Potterton suprima 100L with Drayton wireless control system. The boiler and pump just keep on working it will not switch off, the room sta and the programmer has no effect at all. The only way to stop the system is to switch off the main. I,ve changed a new set of Drayton wireless unit but no help what so ever. Any suggestion will be grateful.
CH pumping out heat non-stop
- Thread starter chuntim
- Start date
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zone valve switch sticking?
Hi Thank you for the reply but please tell me how to unstick the Zoom Valves?
Tim
Tim
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Hi 2face
Thanks for the reply, I've disconnected the room stat and programmer but the boiler+pump still running away happily.
The system has been newly installed about 3 yrs ago and worked perfectly until now. Strange!!!!!!
Thanks for the reply, I've disconnected the room stat and programmer but the boiler+pump still running away happily.
The system has been newly installed about 3 yrs ago and worked perfectly until now. Strange!!!!!!
Perhaps you should listen to GordonGas.
The CH or HW zone valve stuck open is the most likely scenario.
If the thermostat had welded on you could turn the boiler off from the programmer, and if the programmer contacts had welded on you could turn off the boiler on the room stat. Similarly with the hot water circuit.
Each zone valve will (typically) have a grey and orange wire. If there is a valve seized or faulty the grey and orange will be permanently linked, causing the boiler (and pump, in the case of Suprima) to run continuously.
There is a possibility the boiler could have an internal PCB fault, disconnect the switched live connection and see if it still starts.
If none of this makes sense I suggest you call in a professional rather than electrocuting yourself.
NB: Most heating systems have been working alright before they go wrong.
So, common, not strange.
The CH or HW zone valve stuck open is the most likely scenario.
If the thermostat had welded on you could turn the boiler off from the programmer, and if the programmer contacts had welded on you could turn off the boiler on the room stat. Similarly with the hot water circuit.
Each zone valve will (typically) have a grey and orange wire. If there is a valve seized or faulty the grey and orange will be permanently linked, causing the boiler (and pump, in the case of Suprima) to run continuously.
There is a possibility the boiler could have an internal PCB fault, disconnect the switched live connection and see if it still starts.
If none of this makes sense I suggest you call in a professional rather than electrocuting yourself.
NB: Most heating systems have been working alright before they go wrong.
So, common, not strange.
Went to a system only yesterday where both 2 port valves were stuck open. Thought they must be abnormal types at first!
I find in most cases the valve/mechanism is stuck, rather than just the switch. That, is easily found by moving the lever on the valve. It's under the wire on many, like Honeywell.
If the lever is sloppy when the power's off, the valve's stuck open and will hold the boiler on, regardless of programmer and room / cylinder stats.
If the spindle below is free you need a new head, if it's seized you need a new valve.
I find in most cases the valve/mechanism is stuck, rather than just the switch. That, is easily found by moving the lever on the valve. It's under the wire on many, like Honeywell.
If the lever is sloppy when the power's off, the valve's stuck open and will hold the boiler on, regardless of programmer and room / cylinder stats.
If the spindle below is free you need a new head, if it's seized you need a new valve.
It’s very interesting and I’ll look into these zone valves and see whether they are sloppy or free. Getting electricuted may be a posiblity. Its frustrating though. Thanks
Hi Thank you for all your help. I've fixed the system. I've replaced the zone valve and its working perfectly now! very grateful for everybody
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