Drayton LP822 Once button results in permanent hot water

[EddieB]

Guys
Encountered a problem using the above function, when the once button is selected for a boost on the CH the Immersion heater will not then switch off. I have to switch the programmer of for it to reset... any ideas??
The boiler is an Ideal ICOS and the Tank controls are Range

 

[Leesparkykent]

Guys
Encountered a problem using the above function, when the once button is selected for a boost on the CH the Immersion heater will not then switch off. I have to switch the programmer of for it to reset... any ideas??
The boiler is an Ideal ICOS and the Tank controls are Range

Once will stay on until the last time its set to go off.

 

[Octopus]

Is this a new install or a problem with an existing installation?

 

[EddieB]

Once will stay on until the last time its set to go off.

Yeah your right it will operate like that ,but I wouldn't expect the hot water to operate when the CH once button is pushed?

 

[EddieB]

Is this a new install or a problem with an existing installation?

 

[EddieB]

Existing I'm afraid, somethings not functioning as it was!

 

[Leesparkykent]

Yeah your right it will operate like that ,but I wouldn't expect the hot water to operate when the CH once button is pushed?

what is it y, s, c plan etc?

 

[Leesparkykent]

I suspect a y-plan? if it is more than likely a problem with HW off/satisfied side of the wiring or component failure of the programmer or cylinder thermostat. Work through the sequence of switching with your multi meter.