In the morning our heating comes on as we have programmed it to but in the afternoon it doesn't work. The light 'CH' is iluminated so the programing is correct but there's no heat. If you turn the termostat to a higher temperature normally it fires up, but nothing in the afternoon. The boiler is a Glow worm Ultracom 18sxi. It just seems really strange that it works in the morning and not in the evening - I have checked all of the obvious things like 24/12 hour timing etc.

Simon, November 2009

Thanks for your help but it's already set to auto so therefore should be coming on in the morning and night :-)

Simon, November 2009

My programmer / timer has a slider switch marked:

Off - Auto - Once - Continuous

If yours is similar and it's set to Once the boiler will work in the morning but not in the evening - Auto may be better.

Good luck...

Peccavi, November 2009