No Heating but still have Hot Water

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2 Dec 2019
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I have a Worcester Bosch Highflow 400 Boiler. On Saturday night my partner topped up the boiler from 0.5 to 1 & since we have had no heating but still have hot water. When I turn the thermostat on it is not calling for the heating - well the demand light doesn't come on. Can anyone advise please before I commit murder!

(The pump is still running perfectly fine)
 
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Have you followed the fault finding in the manual ? it lists three lights on/off, slow flash, fast flash, alternate flash and a chart showing likely fault.

Google Worcester Bosch Highflow 400 installation instructions if you don't have them.
 
Thank You for your prompt reply it's very much appreciated.

I looked up the manual on Sunday but the boiler does not look like any of the diagrams it shows. I get that boilers change & faults are similar but it's states the fault with no green light is the control board would that stop the heating - the green demnd light comes on for 30 seconds but goes off & I don't see that within the faults in the manual.
 
Finally found the right manual but it doesn't give details of fault finding
 
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Can you post a link to said manual, so that we can be sure we're all talking about the same boiler?
 
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What happens if you add more pressure, does the gauge move? If not there could be a small blockage. I take it the Drayton didn’t make it work?
 
Pressure rises if we add more. When I was clearing the air from the radiator you could feel the hot water coming up through the pipes at the bottom of the radiator.

The Drayton didn’t do anything although I have seen online there has been difficulties wiring it. There is a black wire & a red wire.
 

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