DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Worcester Bosch Highflow 400 RSF - no hot water


 
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
dgwarks

from United Kingdom

Joined: 10 Aug 2008
Posts: 3
Location: Warwickshire,
United Kingdom

PostPosted: Sun Aug 10, 2008 6:44 pm Reply with quote

Hi everyone - I really hope someone will have an answer to this question as I am at my wits end!
We have a Worcester Bosch Highflow 400 RSF boiler and last week it stopped supplying hot water. We only have the hot water on at the moment and the heating and radiators are switched to off.
My father in law is an ex heating engineer so he stripped it down, cleaned everything including the inside of the heat exchanger and gave the boiler a service - still no luck. He then put a new fan assembly in as it seemed to be running slow but it still wouldn't supply more than a few seconds of hot water. He then replaced the safety temperature limiter, a new pressure release valve and a new auto air vent. We fired the boiler up and wunderbar - it all seemed great! We had hot water all afternoon, evening and all the next day. Then the next morning we were back to square one - a few seconds of hottish water then cold. Any ideas??? My father in law has many years of experience but even he is flumuxed. Here's hoping you have the answer...
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
nickso

from United Kingdom

Joined: 30 Oct 2006
Posts: 6378
Location: United Kingdom
Thanked: 236 times

PostPosted: Sun Aug 10, 2008 6:59 pm Reply with quote

probably a dodgy diverter or sludge in the boiler, both common failings on these turds.

if he stripped it down i would have expected him to find oodles of sludge.
Back to top
 Alert Moderators
dgwarks

from United Kingdom

Joined: 10 Aug 2008
Posts: 3
Location: Warwickshire,
United Kingdom

PostPosted: Sun Aug 10, 2008 7:16 pm Reply with quote

Thanks Nick. He did flush the tank at the bottom of the boiler out and used a acid type cleaner in the heat exchanger that did fetch a lot of gunge out. Forgot to say, the diverter was replaced. We have one of those magnetic canisters on the water pipe that takes out metallic gunge too - he stripped and flushed that out, so I can't see what else we can do... Why it should work perfectly for a day and a half and then go back to tripping out is beyond me. Already spent the thick end of 200 in parts already, so not sure where to go from here...
Back to top
 Alert Moderators
nickso

from United Kingdom

Joined: 30 Oct 2006
Posts: 6378
Location: United Kingdom
Thanked: 236 times

PostPosted: Sun Aug 10, 2008 7:28 pm Reply with quote

did he clean out the really thin tube on the diverter assembly? common for blockages causing all sorts of mayhem.
Back to top
 Alert Moderators
dgwarks

from United Kingdom

Joined: 10 Aug 2008
Posts: 3
Location: Warwickshire,
United Kingdom

PostPosted: Sun Aug 10, 2008 7:34 pm Reply with quote

I'll ask him - thanks for the advice - hopefully it might be the problem.
Back to top
 Alert Moderators
ollski

from United Kingdom

Joined: 08 Oct 2003
Posts: 4919
Location: Birmingham,
United Kingdom
Thanked: 55 times

PostPosted: Sun Aug 10, 2008 9:29 pm Reply with quote

Flow switch?
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Worcester-Bosch Highflow 400 RSF - Water Fault 3 1500 Wed Oct 21, 2009 1:49 pm
Worcester Bosch Highflow 400 - Ignition HELP! 3 720 Sun Sep 07, 2008 5:36 pm
worcester bosch highflow 400 3 60 Mon Nov 05, 2012 5:32 pm
Worcester Bosch Highflow 400RSF & Tepid Shower 5 60 Mon Dec 23, 2013 2:17 pm
Worcester Bosch highflow 400 RSf 3 1340 Fri Jun 30, 2006 8:12 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.