How to replace a Baxi 105E microswitch?

[paul_cragg]

Hi
Looking to replace the Baxi 105E microswitch but Worried about getting the white connectors off without damaging the wiring.

has anyone done it and if so is there a trick to getting the connectors off?

 

[Aquarius]

Never done one, but suspect they just pull off - just don’t pull on the wire

 

[snowhead]

Looks like it needs more than a microswitch

 

[paul_cragg]

Looks like it needs more than a microswitch

This isn’t mine, just a pic off the net that showed the white connectors

 

[PETE 123]

Pull off by hand or pliers. With power off.

 

[paul_cragg]

Thanks I tried by hand but obviously didn’t want to go too heavy handed and pull the wire out. didn’t know if there was a knack or if you had to lever them off with a flat head?

 

[Gasmk1]

They are just covered spade connectors so just either grab and wiggle them or use a flat screwdriver to lever them up

 

[RayW]

Flat spade. Just tug ... Interpart Baxi Combi 80E 80Maxflue 80ECO 105E & 105HE Microswitch 248067 5039177618577 | eBay - https://www.ebay.co.uk/itm/124271853887?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=124271853887&targetid=1140163971809&device=c&mktype=pla&googleloc=1006751&poi=&campaignid=12126090633&mkgroupid=117623829555&rlsatarget=aud-629407026665la-1140163971809&abcId=9300481&merchantid=119037449&gclid=CjwKCAjwx6WDBhBQEiwA_dP8rSJaSp4YsQ_BvUA9DsVqEMqmy1OjMlAlk8rVnPSNyVJOOXtNJ4lojhoC7mIQAvD_BwE

 

[paul_cragg]

Flat spade. Just tug *** Interpart Baxi Combi 80E 80Maxflue 80ECO 105E & 105HE Microswitch 248067 5039177618577 | eBay - https://www.ebay.co.uk/itm/124271853887?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=124271853887&targetid=1140163971809&device=c&mktype=pla&googleloc=1006751&poi=&campaignid=12126090633&mkgroupid=117623829555&rlsatarget=aud-629407026665la-1140163971809&abcId=9300481&merchantid=119037449&gclid=CjwKCAjwx6WDBhBQEiwA_dP8rSJaSp4YsQ_BvUA9DsVqEMqmy1OjMlAlk8rVnPSNyVJOOXtNJ4lojhoC7mIQAvD_BwE

Thank you for your response, I have now changed the microswitch which I was hoping would get rid of my intermittent 60 degree error (low pressure or pump fault) pressure is at 1.5 bar and I can hear the pump. Basically I get hot water fine and then at some point after, the error 60 comes on, I have also changed the diaphragm and greased the push rod..not sure what is left to try

 

[paul_cragg]

They are just covered spade connectors so just either grab and wiggle them or use a flat screwdriver to lever them up

Thank you for your response, I have now changed the microswitch which I was hoping would get rid of my intermittent 60 degree error (low pressure or pump fault) pressure is at 1.5 bar and I can hear the pump. Basically I get hot water fine and then at some point after, the error 60 comes on, I have also changed the diaphragm and greased the push rod..not sure what is left to try

 

[paul_cragg]

Pull off by hand or pliers. With power off.

Thank you for your response, I have now changed the microswitch which I was hoping would get rid of my intermittent 60 degree error (low pressure or pump fault) pressure is at 1.5 bar and I can hear the pump. Basically I get hot water fine and then at some point after, the error 60 comes on, I have also changed the diaphragm and greased the push rod..not sure what is left to try

 

[ShaunCorbs]

You need to rebuild the whole diverter valve

As I guess you’ve replaced the front diaphragm washer

Baxi Combi 80E 105E 105HE Diverter Valve Repair Kit 248061 248062 NEW | eBay

We will always help you to have a 100% positive happy buying experience. made with love by.

www.ebay.co.uk

 

[paul_cragg]

You need to rebuild the whole diverter valve

As I guess you’ve replaced the front diaphragm washer

Baxi Combi 80E 105E 105HE Diverter Valve Repair Kit 248061 248062 NEW | eBay

We will always help you to have a 100% positive happy buying experience. made with love by.

www.ebay.co.uk

You are correct, I replaced the diaphragm which did have a rip, when you say build the diverter, I assume you mean only on the DHW, as not having any symptoms on the CH. Do you mean replacing the spring, mushroom and pushrod as in the attached link to the service kit: Baxi combi 80e & 105e DHW Hot Water Diaphragm, Repair Kit with plate 5111137 7824400586123 | eBay - https://www.ebay.co.uk/itm/Baxi-combi-80e-105e-DHW-Hot-Water-Diaphragm-Repair-Kit-with-plate-5111137-/273291486363?_trksid=p2349624.m46890.l49286

 

[ShaunCorbs]

The pump proving switch isn’t on the hot water diaphragm it’s the one behind that one

what’s the fault other than the code

watch the rear microswitch when the fault happens

 

[paul_cragg]

The pump proving switch isn’t on the hot water diaphragm it’s the one behind that one

what’s the fault other than the code

watch the rear microswitch when the fault happens

After every 4th or 5 th time the hot water has been run, at some point, the fault light comes on. I don’t believe it is whilst the hot water is running or straight after it has run but at some point after. If you leave it with the 60 light flashing, eventually it will go off. Thinking the pushrod might have been slow to retract but have watched it and it seems ok, did clean and grease it.

 

[ShaunCorbs]

The front diaphragm doesn’t control the pump the rear one does

 

[paul_cragg]

The front diaphragm doesn’t control the pump the rear one

The front diaphragm doesn’t control the pump the rear one does

So do you think that may that one has also split? I have ordered so fingers crossed

 

[ShaunCorbs]

That’s the pump proving one so providing your info is correct should fix your problem or it’s a weak pump

 

[paul_cragg]

Sorry, I have one last quick question, when I replaced the DHW diaphragm, I just turned the Mains off and ran the hot tap until there was no more water. Am I able to do the same when replacing the CH diaphragm or do I have to drain the boiler?

 

[ShaunCorbs]

Have to drain the heating system if your upstairs and above the radiators only need to drain the boiler but if your downstairs need to drain everything above the boiler

 

[paul_cragg]

Have to drain the heating system if your upstairs and above the radiators only need to drain the boiler but if your downstairs need to drain everything above the boiler

Thanks for all your help, so just so I am clear if you are replacing the DHW diaphragm you just need to turn mains off and run tap but if you are changing the CH diaphragm you have to drain the boiler? I will also get some fernox inhibitor when I do drain it down

 

[ShaunCorbs]

Correct and anything above the boiler