Bosch Worcester 25si/28si - help no heat or water!!

[Jocb]

Hello , i do hope there is someone out there who can help - its getting colder by the minute in here. A week ago i bled my radiators and topped up the boiler and all was well until tonight when my daughter went for a shower - there was no hot water. when i checked the boiler the central heating demand button was flashing slowly red. I pressed the reset button and can hear the boiler trying to ignite but it wont. I have read up and it would seem that the first port of call would be to defrost a condensate tube - i cant seem to find anything that matches the decription of 'plastic pipe coming from the bottom of the boiler and exiting the building'! anything under the boiler is copper. I do have a flue that exits the house from the rear of the boiler - its a few inches in diameter - is it likely to be that?
Anyway , if any of you have any hints or tips they would be gratefully recieved. Many thanks JOCB

 

[Blackcatgas]

Your boiler isnt a condenseing one, so It wont have a condense pipe.

 

[Jocb]

Blackcatgas that would make sense - thank you for that, i shall stop looking for one

 

[Blackcatgas]

Press the reset button.

 

[Jocb]

Blackcatgas thanks, I have tried that - the boiler sounds like it is trying to ignite but doesnt, then after 4 or five attempts the light begins flashing again.

 

[Blackcatgas]

Which light is flashing? how many lights are flashing?
(Ive got the 28si manual in front of me btw)

 

[Jocb]

thank you for persisting with this Blackcatgas,
the light that is flashing is the central heating demand indicator, it is flashing red , slowly. There is a green light present (on the mains electricity indicator) and there are no other lights on

 

[Blackcatgas]

"Lock out" Press the reset for at least 1 second, (which you probably have been doing), have you got a pre payment gas meter? has it run out of credit?.Has somone accidently knocked the lever on the gas meter unlikely I know but just check.

 

[Plumbcrazy56]

I have checked the fault finding chart for a slow red flashing neon,It is most likely the gas valve has failed.The boiler will try to light 4 times and then go to lockout.
You can download the instructions here. 24Si II (discontinued June 2007) literature - Worcester, Bosch Group UK installer site

 

[Blackcatgas]

I have checked the fault finding chart for a slow red flashing neon,It is most likely the gas valve has failed.The boiler will try to light 4 times and then go to lockout.
You can download the instructions here. 24Si II (discontinued June 2007) literature - Worcester, Bosch Group UK installer site

Which is way beyond the scope of a diyer. Best get the extra blankets out.

 

[Jocb]

I have been and checked the lever - and to make sure lit the gas burners on the oven for a few minutes to make sure gas was coming in, all is ok there. i am not on a prepayment card so i know its not that.
pressin the reset button now causes no change whatso ever unless i hold it for approx 10 seconds when the light goes out and then immediately its flashing red again, there is no trying to reignite either. ho hum, thank for trying

 

[Plumbcrazy56]

I didn't suggest he tried to mend it himself, It was in case he didn't have them to hand when he called an engineer out.

 

[Jocb]

i have the manual here, i have tried tha reset button now to no avail, thanks for your help

 

[Jocb]

and i am only a beginner DIY - er at that!! Have got the blankets and hot water bottles at the ready, thanks xx

 

[Blackcatgas]

I didint suggest that you suggested that he mends it himself.