Diverter Valve not lifting enough to operate Microswitche

[Gnarly Neil]

Help

After a long running battle with my lovely EuroCombi SX20. I have fixed several faults and yet more come on>..>>>> Should have chucked it out 2 years ago!!

Recently I fixed a very noisy and intermittent flue fan.. now it's very quiet allmost a pleasure to have in the house!

The latest problem seemed to occur when I drained the boiler to replace a leaking PRV. All done OK and Pressure Vessel represurised to correct pressure rises during CH operation.

I cannot see how any of that will have affected the HW side of things but now the Hot tap has to be nearly fully on before the Diverter valve ram presses up with enough force to operate the microswitches above the valve.

The flow is really good at 15 l per minute as per the commisioning instructions but the boiler won't fire until you get to at leat 10 l/min.

My wife is starting to doubt my skills and I really need some help.........

 

[ChrisR]

Change the diaphragm - quick (if you have a small right angled ratchet screwdriver) and cheap . Sometimes the diverter valve shaft binds on its glands, in which case youcould dismantle clean and grease, but its really wort getting a new one. Not expensive.

Either way you have to drain the boiler and turn the CW off. Don't use the boiler's own isolators, OR the prv to drain it..

In the meantime you could stick a 5p piece on the end of the actuator...

 

[Gnarly Neil]

Chris many thanks

I have added some suitable material to the top of the arm 1.5mm and it has made the situation "perfek" as they say.

I will go for the Divertor Valve repair as you suggest. One question however. You mentioned , don'y drain with the PRV . Can that cause problems?? A little knowledge is dangerous and I am sassuming that I could have caused this failure by doing the PRV drain method!!!

 

[taydo]

hi dont drain from the prv coz they tend to jam and leak once used so you will be needing another new one



Brian