Worcester Bosch 37CDI

9 Dec 2009
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West Midlands
United Kingdom

Boiler: Worcester Bosch 37CDI 5 years old, serviced regurlarly
3 zones: 1 - Under Floor Heating 2 - Hot Water Unvented Cylinder 3 - Central Heating - operated by a wireless Honeywell CM927.

I have started to have issues when the room stat is requesting heat and the boiler isn't kicking in, even though the motorized valves operates when the stat ask for heat. Also the valve for zone 1 works okay when the under floor heating stat requests heat, just that again the boiler does not fire up.

I carried out a reset on the front panel of the WB even though no error messages were showing and after the initial =//= for 15 mins - the boiler started responding again. I have had to do this twice in the last week.

Has anyone had similar issues or provide guidance as to what may be the issue?

Thanks :)
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