Glow worm compact 80e - No hot water, but rads work fine?

Sounds like your diverter is faulty. Possibly a jammed diverter valve (figure 14.13) or a blown thermistor (figure 14.14) or a dodgy microswitch (figure 14.17), where all figure numbers are from online manual at

http://www.glow-wormorders.co.uk/manuals/pdf/Boilers/Compact80E_UIS.pdf

Mark
November 2008