Boiler does not switch off when optimum temp reached

[cakeswithus]

Hi

we have a Vaillant (?spelling) central heating boiler and Danfoss TP5000 + RF programmer along with an RX1 reciever...

we have changed the batteries and moved the programmer next to the receiver to make sure no issues with signal blockages...

when the timer tells the heating to come on, it all fires up nice and when the timer tells it to turn off the red light goes off on the receiver, but the boiler does not turn off...

likewise if we manually turn the temp up on the programmer the boiler fires up and when we turn it down the boiler does not turn off.

the only way we can get the rads to go cold is to turn them off on the boiler control panel itself.

Hubby has reset both the programmer and the receiver (as per manual) and still it does not work.

Can anyone offer any advice or should we just buy a new receiver or replace both?

Many thanks

Sam

 

[45yearsagasman]

Do you have any motorised valves? Maybe like these View media item 44939 View media item 38425

 

[cakeswithus]

Hi Pete.

Thank you for commenting.

Not to our knowledge no...

any other ideas?

Thanks,
Sam

 

[45yearsagasman]

Model of boiler would help.

 

[cakeswithus]

It us a Vaillant ecoTec plus 831 and was installed with the thermostat and reveiver on 14/12/06.

Do you think it maybe a boiler problem then?
hot water is fine.

Thank you for assistance so far.

 

[Ashworth1]

Sounds like there is a fault with the receiver

 

[St0rmer66]

In my experience receiver's usually fail to OFF not on, but it's not impossible.

Could be stuck diverter valve and the preheat on the boiler is on?