How to mend Glow-worm Mark2

I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?

Which way to turn slotted screw to adjust water pressure up on a glow worm ?

fitting thermostat?

Glow worm flexicom 30cx auto air vent - how do I replace?

How to fix glow worm 18 hxi ?

Suprima 50?

Glow.worm ultracom 38 cxi showing f25 faultcode?

Bt Gas glow worm 330 timer controls not working?

What can I do about a Glow-worm Flexicom 30cx fault code F11?

glow worm 2boiler fires up for 10 to 20 mins then shuts off whats wrong?

I have moved into a flat am dissabled carnt get heating on unit flashing F1?

Glow-worm micron 60ff boiler niosy ?

glow worm 30cxi bolier?

BMU error code?

Home heating systems?

GS 24i junior boiler timer broken?

Intermittent boilet fails to fire on heating?

Is it normal that the flame is burning all the time?

Glow Worn Micron 50FF?

glow worm 30c boiler,no hot water?

performa 30 he fault fan flue lights on ?

glow worm 24cxi boiler?

How can I fix my glow worm flexicom 30cx ?

My central heating is not working?

Central heating not working?

boiler Glow-worm30cxi 30cxi not working?

My radiators not heating up?

Glowing 30hxi?

what causes the sabre he 25 to come on, on its own?

how can i fix my central heating. Glow-worm ultimate?