DIY Vokera repair?

[lukas125]

Having a problem with my Vokera 20/80 Flowmatic boiler, where the hot water runs hot, then cold, then hot etc etc... but the CH works fine.

I'm pretty sure this is due to a faulty diaphragm in the DHW manifold, and it looks relatively straight forward to replace this part after reading the servicing manual. But, I am not a plumber and have never done anything like this before. Has anybody replaced this part, and is it as straight forward as it looks? (Obviously I would be staying well clear of the gas side of the boiler.)

 

[villa_tom]

Once the front cover is taken off the front of a boiler it is classed as "gas work", so regardless of weather or not you are touching a gas part it will be deemed as illegal work on your part. My advice to you would be leave well alone and get a GSE in to do the work. ok it will cost a bit but you can't really put a price on your safety. And what makes you so sure its the diaphragm?? could be a number of things, thermistors etc. If your going off the MI's then i wouldn't bother there not always right, if i where you then i'd get the professionals in.

 

[PlumbBobBob]

totally agree with tom once cover is taken off it becomes the realm of the gas engineer only.

 

[villa_tom]

totally agree with tom once cover is taken off it becomes the realm of the gas engineer only.

high five

 

[PlumbBobBob]

indeed

 

[aggis]

Have changed many dhw diapragms on the 20/80, not a diy'ers job.
If the burner fires up & water gets hot then burner doesn't modulate but goes out for a while[ cold water] it ain't your diaphragm!
You need to get an experienced GS repair engineer. It's a fan/flue related problem