Baxi HE 80 Instant- Divertor Valve Issue

[twentytwenty]

I wonder if anyone can point me in the direction to try and fix the following.

In a nutshell the pin in the divertor valve is sticking - see location in image below. (that's what I can decipher anyway).



When I run hot water the pin sticks out. It remains in this position and the heating never comes on when set on the timer or by using the 'Heating On' mode.
To get the heating to work I just pop off the sensor and push the pin in and the heating comes back on (if it's set to come on the timer etc..)

It has recently had a new diaphgram...

Any idea on what a fix might entail.

I have read somewhere that you pin might need greasing or could it be something more substantial. If so it might force me to purchase a new boiler.

Thanks for your help and advice.

 

[Ihavenojob]

If the washers in the weep tubes to the valve are the wrong size (ie the hole restricted) this can cause the symptoms you have.

 

[twentytwenty]

If the washers in the weep tubes to the valve are the wrong size (ie the hole restricted) this can cause the symptoms you have.

To my knowledge they have never been changed. Where are they located?

 

[Ihavenojob]

Where are they located?

The flow switch you are pointing to has 2 small pipes going to the underneath of it, the unions where they join have small fibre washers in them.If the diaphragm in it was changed, then PTFE tape may have been used to re seal them.

 

[ianmcd]

In a nutshell the pin in the divertor valve is sticking

That part you are pointing to is the differential valve, you have a restricted flow problem or weak pump problem, and your boiler is a Baxi HE 80 Instant, not an HE80 they are different

 

[twentytwenty]

That part you are pointing to is the differential valve, you have a restricted flow problem or weak pump problem, and your boiler is a Baxi HE 80 Instant, not an HE80 they are different

Thanks for the reply. Is it easy to check if it a restricted flow problem?. I'll update the title too.

 

[Ihavenojob]

Try replacing the washers, if the hole is too small it will restrict the flow to either side of the diaphragm.As it can be pushed by your finger, I doubt if it's seized. these are the ones
https://www.wolseley.co.uk/product/baxi-248735-washer/

 

[ianmcd]

Thanks for the reply. Is it easy to check if it a restricted flow problem?. I'll update the title too.

drop the system pressure and cover the pcb cover with clingfilm or a towel , any remaning water in these goes straight into the electronics if not protected, remove and inspect the hydraulic venturi, (see manual ) they are the most common problem on these, they break up and cause the problem you are having , @gas112 is very experienced with these , I have tagged him for you and he might be able to suggest something else

 

[gas112]

pin may gunged up or it may have become detached from the the plate that its attached to plate moves for hot water and when it returns it leaves the pin activating switch , happening quite a bit on non instant 80 and 105s now they are getting on for 20 year old as plastic disintegrates