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 

Baxi Combi Boiler 105e - No Hot water problem.


 
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
Stubingham

from United Kingdom

Joined: 01 Jul 2007
Posts: 14
Location: Lancashire,
United Kingdom

PostPosted: Sun Jul 01, 2007 12:33 pm Reply with quote

When the boiler is set to either central heating or hot water the boiler does not fire up when turning taps on for hot water. (But the central heating works.) No hot water comes through taps, unless central heating is manually turned on at the boiler, (making the boiler fire up). The tap light does not illuminate at any stage. The central heating works, and I have also tried re-setting the bolier the same problem occurs. Any suggestion would be greatly appreciated.
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.
Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52428
Location: London,
United Kingdom
Thanked: 3285 times

PostPosted: Sun Jul 01, 2007 12:34 pm Reply with quote

DHW flow switch is not operating!

Tony
Back to top
 Alert Moderators
namsag

from United Kingdom

Joined: 12 May 2004
Posts: 9909
Location: United Kingdom
Thanked: 321 times

PostPosted: Sun Jul 01, 2007 12:38 pm Reply with quote

Diaphragm gone in water section. , bottom left of boiler round brass bit with a microswitch on it
Back to top
The following 2 users say thank you to namsag for this useful post:
DavidMlynski (29 Nov 2010), bluemoonspark (15 Feb 2010)
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17597
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Sun Jul 01, 2007 3:10 pm Reply with quote

When hot tap turned on you should see a metal pin pop out of the bit namsag described. If it doen't then defo the diaphragm.
Back to top
The following user says thank you to gas4you for this useful post:
DavidMlynski (29 Nov 2010)
 Alert Moderators
Stubingham

from United Kingdom

Joined: 01 Jul 2007
Posts: 14
Location: Lancashire,
United Kingdom

PostPosted: Sun Jul 01, 2007 4:07 pm Reply with quote

Thank you for your feedback.
A pin comes out of the microswitch bracket on the DHW Pressure differential valve, when the hot water is turned on. But does not fire up the boiler and the hot water still does not come on.
Does this mean we need a new microswitch bracket?
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17597
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Sun Jul 01, 2007 4:59 pm Reply with quote

Remove the microswitch and gently insert a small screwdiver and press it. If boiler fires microswitch is ok and maybe pin isn't coming out far enough.
Back to top
The following user says thank you to gas4you for this useful post:
DavidMlynski (29 Nov 2010)
 Alert Moderators
Stubingham

from United Kingdom

Joined: 01 Jul 2007
Posts: 14
Location: Lancashire,
United Kingdom

PostPosted: Sun Jul 01, 2007 5:40 pm Reply with quote

Your Right Dave,
When turning hot water on the pin comes out about 7mm and makes contact with the DHW Switch plate. But the plate does not retract enough to make contact with the switch connection.
I've tried pulling pin out further, but that does not work.
Does the switch need replacing or the pin assembly(?) ? Please advise.
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17597
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Sun Jul 01, 2007 5:42 pm Reply with quote

It sounds like namsag originally says. Replace the diaphragm. This is supplied in a kit with other little 'o' rings etc. Grease the pin and check for straightness whilst it is out.

Have you checked switch as I previously said?
Back to top
 Alert Moderators
Stubingham

from United Kingdom

Joined: 01 Jul 2007
Posts: 14
Location: Lancashire,
United Kingdom

PostPosted: Sun Jul 01, 2007 6:42 pm Reply with quote

I manually pressed the switch and the boiler fired up.
So I guess the switch is alright.
By striping the dhw pressure differential value to fit the diaphragm, have you got to switch the water off and drain the system, or can you just turn the boiler off and the eleic power to it?

Thanks for the help
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17597
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Sun Jul 01, 2007 7:39 pm Reply with quote

Turn off electric whenever working inside a boiler icon_eek.gif Turn off cold mains under boiler, isolate flow & return and drain from internal boiler drain, NOT the prv.

Have some cloths ready and a tub under the diaphragm housing to ctch any remaining water. Make sure no water goes on electrics or in pcb housing.
Back to top
The following user says thank you to gas4you for this useful post:
bluemoonspark (15 Feb 2010)
 Alert Moderators
Stubingham

from United Kingdom

Joined: 01 Jul 2007
Posts: 14
Location: Lancashire,
United Kingdom

PostPosted: Mon Jul 02, 2007 8:19 pm Reply with quote

Cheers Dave !

One diaphragm and 10 min's later job done. (Maybe 20 mins )

Cheers Pal
Back to top
 Alert Moderators
davek1

from United Kingdom

Joined: 19 Jan 2009
Posts: 2
Location: Nottingham,
United Kingdom

PostPosted: Mon Jan 19, 2009 4:31 pm Reply with quote

Hi,
I`ve got a simmular problem the hot water on my baxi 105e combi boiler sometimes heats up very hot but sometimes only go's warm, also i have the preheat turned of on the hot water but it still keeps firing up for a few seconds then going off. I have checked the micro switch on the pressure diferential valve & it is ok. Does anyone know if this problem is likely to be the diaphram or something else.
Cheers Dave
Back to top
 Alert Moderators
bluemoonspark

from United Kingdom

Joined: 15 Feb 2010
Posts: 1
Location: Lancashire,
United Kingdom

PostPosted: Mon Feb 15, 2010 11:40 am Reply with quote

icon_biggrin.gif

Many thanks, to namsag and gas4you in particular. I had this problem, no hot water from my shower and intermittent hot water from the taps; it was the diaphragm (cost 4 from ebay but might be even cheaper from a heating suppliers?).
You don't need to take the DHW Pressure Differential valve out of the boiler, just undo the two sensing pipes, unscrew the micro switch and then the six valve screws, watch the spring doesn't shoot out. When reassembled don't forget to charge the boiler with water to 1 to 1.5 bar and check again later when the central heating has ran for a while.

Dave
Back to top
 Alert Moderators
steve345

from United Kingdom

Joined: 01 Nov 2010
Posts: 1
Location: Yorkshire,
United Kingdom

PostPosted: Mon Nov 01, 2010 6:01 pm Reply with quote

Agile wrote:
DHW flow switch is not operating!

Tony

having a simular problem where is the dhw 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 
Baxi Combi 105e - Hot water problem. 18 3520 Wed Oct 04, 2006 9:58 pm
Hot water problem with Baxi Combi 105e 4 2240 Wed Apr 04, 2007 9:49 am
Baxi combi 105e - hot water problem - seems to 'run on' 2 40 Wed Oct 26, 2011 5:43 pm
BAXI COMBI 105E...... HOT WATER PROBLEM (DIAPHRAGM) 3 1120 Fri Nov 27, 2009 8:14 pm
BAXI 105e combi - hot water/heating problem 11 2700 Tue Sep 18, 2007 9:03 am


 
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.