Worcester Bosch Greenstar 30si combi boiler

sunsetboulevard

Hi, I had the above boiler installed end of last year.

Since about April this year I've had no central heating on, just been using it for hot water. I just thought I'd give the central heating a quick go, just to make sure it will be working when winter comes but the central heating doesn't seem to be working.

I'm not familiar with this boiler at all, so if I tell you what I do know about it can you tell me if I'm doing something wrong, please?

The blue 'power on' light is on. The off/timed/on switch is on 'timed' and I had those little peg things (don't know the technical name for them) on the timer switched in to come on at the time I wanted the heating on. The main electrical switch (I think it might be called a 'fused switch' located underneath the boiler on the wall) is 'on'.

The only thing I've noticed is when I flick this fused switch 'on' the green burner indicator light initially lights up but then goes out. I'm sure it was on all the time when I had the central heating running earlier in the year. Might be wrong about this.

If this is the problem does anybody know what I have to do to make the green burner indicator light come back on and stay on, please?

Additionally, in case it's relevant the water pressure dropped to nearly zero earlier on in the year but the Worcester Bosch engineer came and re-pressurised it to about 1 and a half and it's stayed at that pressure ever since. Don't know if he touched anything else on the boiler that might explain why it's not working for the central heating.

Just as an additional bit of info, I've got a Drayton room thermostat in the hallway. It's a very basic one which is either model 30002 or RF601 (that's what it says on the instructions sheet). I don't know if there's a clock on that which might need adjusting but I'm not aware of one.

Thank you.

FLAPJACK

Try switching the off/timed/on switch to ON .....it's the very bottom of the LCD panel...this will override the timer settings (the peg things).

After a few seconds the green burner indicator should come on and stay on.....alternatively what you are describing could be a safety feature it the circulation pump for the CH has jammed over the summer through no use.

daveyjp

You will need the thermostat turning up, it may be too warm in the room for it to need heating. Turn it to max test the system and over ride the timer.

If the pump is stuck its shoddy design from Worcester. Other modern boilers will fire the burner and turn the pump momentarily even when turned off to ensure they don't stick.

sunsetboulevard

Thanks for your replies yesterday. I set the control to 'on' as opposed to 'timed' and everything worked lovely.

Wonder if I could just ask something so I will know for the future, please?

What is the correct way to set the boiler controls when in future I want central heating turned off but want to get hot water only on demand?

The way I had it set, was all the peg things on the clock not pressed in and I had it on 'timed' setting. Can't really work out how it had been giving me hot water all the time when I needed it but it did, never had any problems.

I think, on reflection, perhaps I should have turned the bottom left-hand knob on the boiler to the frost setting and that would have been the proper way to turn off the heating? And then I should have had the off/timed/on button set to 'on' to get the hot water?

Also, if I am only using the boiler for hot water and not central heating does it cost any more to have the boiler set to 'on' constantly? Or will I still only be using the same amount of gas?

Sorry if this post doesn't make sense. I lent the instruction book to a friend some time ago and have not seen either the friend nor the book since!

Thank you.

Leif

If you go to the WB web site, you will find downloadable copies of the user manual.

cyclonebri1

You really should run the system up every few weeks to prevent it "stiffening up":eek::eek:;);)

Yes the pump will get a quick run when cooling the boiler after hot water requirement, but it's not the same as a bringing the system up to temp every now and again.