problem with control unit (boiler)

[littlekates]

Hello all, please help me regarding my central heating problem. Basically when i set the control unit (lifesyle LP522) to "OFF" position the boiler still turn on and wont go off, The boiler is a combi "Potterton Suprima 30 L". All the radiators is boiling hot and i cant shout the boiler down from the main switch or i will have no hot water in the morning. Im not sure what to look for as i have not idea when it come to boiler and it control unit. Could this have something to do with the control unit? Anyone have similar problem please advise. Much appreciated This problem only started tonight

 

[gas_man_gaz]

its not a combi its a system boiler.. prob a prob with ya valve(s) have a look in ya airing cupboard and tell us if ya have 1 or 2? and what make

 

[littlekates]

All i can see is a "Drayton ZA5 Zone Valve Actuator" and "Honeywel"l not sure if this is what you looking for.

 

[Agile]

It sounds as if she has two 2-port valves. One of which has probably failed.

I really dont see what she is going to be able to do herself.

As always she need a competent heating engineer.

Tony