worcester greenstar 30CDi System boiler

[fsd123]

Hi all
we have the above boiler which is producing hot water fine but suddenly no heating. So I noticed the pressure had dropped to almost 0 so repressurised to 1 but that did not help. I checked all the radiators did not need bleeding then tried the RESET button. Then I tried turning off and on. There are no error codes or warning lights or funny noises. The blue mains light stays on (i.e. no flashing) and the digital display hovers around 70. I turned the Honeywell wireless HCW80 thermostat up(I even changed the batteries just in case). I think the green burner light is supposed to come on when heating maybe but it does not.
There is a central heating temperature dial on the control panel and turning that up did not help.
Any comments would be very gratefully received.

[plumbbob]

If the boiler is producing hot water ok then the problem does not lie there.

Check the room thermostat receiver is functioning correctly. It is the most likely cause of the problem.

Any more info about the system would be useful in helping a diagnosis.