DIY Forum

 

Ultimate HandymanUltimate Handyman on Pinterest

 

DIY Forum/Home improvement advice forum

 

 

A-Z CONTENTS | DISCLAIMER | DIY VIDEO | HOME | SAFETY FIRST | FORUM RULES

It is currently Sun Oct 21, 2018 1:34 pm
Visit Hilti


Time zone: Europe/London [ DST ]




 

 


Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Baxi flowswitch problem
PostPosted: Thu Mar 09, 2017 6:52 pm 
Offline
Newly registered Member

Joined: Thu Mar 09, 2017 6:14 pm
Posts: 1
Has thanked: 0 times
Been thanked: 0 times
Thought I might share my experience of flow switch problems in a Baxi 100/2 He plus although I think this type of flowswitch is/was fitted to a number of conventional Baxi/Potterton boilers. It is a simple on/off switch, open circuit when the pump is off ie no flow and closes the circuit when flow is present. It has a paddle-magnet that operates a reed switch of some type embedded in the body.

About 4 years back I had a motorized valve failure where the valve closed (Danfoss) but the microswitch was still making a circuit, attempting to run the pump and the boiler but against a closed circuit ie no flow. Clearly the boiler flow switch should have prevented any attempt by the boiler to fire up, but it was heard knocking and banging (in the garage so prettty loud!) the thermostat seemingly kicking in each time it overheated because of no water flow. On checking the flowswitch with a meter it had a permanently closed circuit. I stripped it out (a bit awkward and be gentle on the o-rings!) and found it was jammed open by a build up of iron oxide particles stuck to the magnetic paddle. It can be dismantled for careful cleaning. I fitted an Altecnic (same make as the flowswitch coincidentally!) magnetic filter system to the return pipework as I did not fancy a repeat.

Anyway just had exactly the same thing happen again - boiler banging away last week one morning with the timer set to OFF - replaced the microswitch in the Danfoss motor valve and all ok. Cleaned out the magnetic filter on the boiler, some particles found but still 95% empty. Stripped out the flowswitch and hey.. jammed with particles again.... Frightening really.... Why a magnetic switch in an environment full of metal particles...???


Share on FacebookShare on TwitterShare on DiggShare on DeliciousShare on Google+
Top
 Profile  
Reply with quote  
PostPosted: Sat Mar 18, 2017 12:27 am 
Offline
Gas/Heating Expert

Joined: Tue Dec 18, 2007 1:20 am
Posts: 3182
Location: London/Midlands
Has thanked: 27 times
Been thanked: 295 times
Cheap and easy design.

Those magnetic particles were not the boiler makers but dirt which should not have been in the system.

Good riddance to the installer who did not clean the system to have to pay for all the subsequent repairs!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

 

 




Similar topics
   

Time zone: Europe/London [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


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 post attachments in this forum

Search for:
Jump to:  
Visit Solent plastics


 

 

 

News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy

Contact

 

Powered by phpBB® Forum Software © phpBB Group

phpBB SEO