Combi boiler radiators not heating up

topcat105

Hello all.
I've got a Worcester 8000 combi boiler that's 3 years old.
I've just turned my heating on to make sure it's working for the coming winter and my radiators are not heating up.
Hot water is fine. I've checked the pressure (1.5) and reset the boiler by turning off and on.
The flame symbol comes on for about 30 seconds then goes off again.
Is this an easy thing to fix or do I need to call an engineer out.
TIA 

Ayr_Rage

Are there any error codes displayed?

Can you hear the boiler firing up when the flame symbol shows?

Can you hear the pump running and the diverter valve moving at all?

Is there s RESET button and have you held it in for the recommended time?

topcat105

No error codes.
I can hear the boiler firing up but stops again after less than a minute.

topcat105

Just noticed this symbol appears before it shuts itself off.....

Ayr_Rage

topcat105 said:

No error codes.
I can hear the boiler firing up but stops again after less than a minute.

Can you hear the pump as well as the combustion fan?

As none of the internals are user serviceable then it's time to get an engineer to have a look if the RESET button hasn't worked.

My bet is a stuck diverter valve as you still have hot water but I'm no expert.

topcat105

Thanks.
The 2 buttons on the right of the display are supposed to reset when pressed together for 5 seconds but that didn't work so I just turned it off and on at the switch.
Is a diverter valve expensive ?

Ayr_Rage

I think that symbol means the condensation trap is filling, mine does it when the heating starts if not used for a while but the radiators still get hot.

Eldi_Dos

Ayr_Rage said:

I think that symbol means the condensation trap is filling, mine does it when the heating starts if not used for a while but the radiators still get hot.

If that is the case could running the hot water tap for awhile fill the condensation trap?

topcat105

I had a bath earlier so the hot water was running for a while.
Still the same 

WIAWSNB

How long did you leave it calling for heat? That does look like the 'syphon fill' symbol, and it looks as tho' the DHW doesn't do this, so it needs the CH to be running for a while - which it does at a slow rate until the trap is filled.
Try leaving it for longer - give it a good half hour. 
https://www.worcester-bosch.co.uk/support/troubleshooting/faqs/all-faqs/what-do-the-error-symbols-mean-on-my-boiler
If it still doesn't work, call WB up on that number - it is surely still under warranty? 

Ayr_Rage

WIAWSNB said:

How long did you leave it calling for heat? That does look like the 'syphon fill' symbol, and it looks as tho' the DHW doesn't do this, so it needs the CH to be running for a while - which it does at a slow rate until the trap is filled.
Try leaving it for longer - give it a good half hour. 
https://www.worcester-bosch.co.uk/support/troubleshooting/faqs/all-faqs/what-do-the-error-symbols-mean-on-my-boiler
If it still doesn't work, call WB up on that number - it is surely still under warranty? 

@topcat105's boiler only runs for 30 seconds in heating mode before shutting down so no chance to fill the syphon.

It needs an engineer!