Plumbing Problems in the UK? Ask a Plumber Now.
S30 is the status code for no demand.
it sounds like your boiler does not know the tap is running?
ok. what type of room stat do you have?
ok, we can try a quick check to see if it is a stat problem.
Can you trace the wire back to the boiler (take a photo of the wiring) and disconnect the wires and replace with a link and see if you can get the boiler to fire?