I've a problem with my

Question

I've a problem with my central heating, I've changed my central heating programmer to a drayton lp522. My heating is constantly on. The only way that I am able to turn it of is with the thermostat when I turn it down to 0. I can't turn it of at the programmer. The instructions with the programmer confirmes that I should be able to and I was able to with the previous one.

It's driving me up the wall.