Priority Reversing Valve on an Ecomax 800 (825/2e)

[dezplumb]

This is my own boiler, I'm a gas safe breakdown engineer but never worked on Valiants (mostly Baxi), most activator heads have your bog standard Black, Brown and Blue to operate the heads but this bad boy has a pink wire!

anyone know the operation of this pink wire?

I've heard you can manually operate it too by removing the motor

basically, I don't just wanna replace the Diverter (Priority Reversing) Valve if it's actually just getting the wrong signals from the PCB!

any help?

 

[The831Bunny]

Symptoms would be a better starting point

Motor failure or PCB motor supply problems on this model are extremely rare. More than likely to be leaking/sticking DV, PHEx blocked or hose blocked. Has it ever been serviced, EV done, CO2 checked, door seal changed etc?

If you are GS registered then the Combustion Chamber is a better place for industry technical info. We can't post gas related advice if you need it here I'm afraid.

 

[dezplumb]

I will check out that other website thanks

It's more to satisfy my curiosity, we bought this house from a disabled lady who had died, it was installed 6 years ago and never been serviced, so i serviced it, adjusted, replaced seals and the leaky rubber hose on the flow (what a mess that was!)

Basically, the DV is passing, the preheat (or warmstart as Valiant dub it) will come on and heat the house (unless u disable it) and the DHW demand heats the flow pipe and giving lukewarm water out of the taps

i know from exp that the DV is more than likely just blocked up, maybe the plate to plate too, (probs with the rubber from the deteriorated flow pipe hose) but that pink wire to the motor had me scratching my head

but yea, i'll check that site out thanks!

 

[The831Bunny]

Just replace the DV complete. Done thousands, if it's passing then 9 times out of 10 it will be DV. Just to make sure though, you can get the same symptoms from a stuck open bypass. You may have got some debris in it from doing the hose. It sits just right of a tee on the flow pipe behind the condense trap. Have it out and check the tee branch and bypass for crud before you change the DV. My money's on the divertor though.

The Combustion Chamber just needs an email sending and details of your GS registration and you're in! Details are at the top of the main P&H page.

 

[dezplumb]

I've sent my details off, thanks for advice on that DV!