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Thanks for all the help guys. The customer is happier now, still abit annoyed about hot water boost button not working. I think I will have to travel down to Vaillant at Elland to have some training on these weather compensaters not only for installation purposes but so I know all the ins...

That looks like 15mm gas coming up through the floor then upsizes to 22mm. That's very bad workmanship

Thanks Dave have now found second installer menu and changed d.70 to 0. It was on 1. The hot water now heats up on times program when heating is on as well. But the override boost on hot water still doesn't work ( press the F button 4 times ). Vaillant techy phone in sick so no help from...

Sorry just read the installer manual on how to access 2nd diagnostic level.

Sorry all connection are going to the VR65 except pump and external senor which go to the boiler. The honeywell cylinder stat goes to connections cyl + and -, the ch zone valve live neutral earth to connection L,N and E CH and same respectively for HW zone valve finally ebus connection from vrc...

I might be getting confused with viessmann boiler with regards to internal DV, but still can't access d.70 in boiler installer menu ( press i and + togeteher ). You mention 2nd level diagostics how do access this menu? Also in the VR65 instructions it says that d.97 alters the operation of...

The heating curve is at 2.6 as recommend by Vaillant. The hw and ch program overlap one another, so they are times when they are on together. When the hw program is on by itself the flow temp is fine ( 80 degrees at max temp ) With this being a open vent convectional boiler d70 is not...

I am certain you can use a standard cylinder stat ( have the vr65 wiring diagram infront of me now ) and it is connected to the + and - where is says "cyl" Have left the link in 3 and 4 in the boiler and all other wiring from vr65, vrc 400 and boiler link in ebus except pump, zone valves and...

Yes I have both heating and hot water controls at max. All wiring is carried out as explained in the VR65 manual. ( Double checked ) When the compensater is used as a room stat i changed installer setting 0 -RT : 2 (factory set at 0) but this what is said in the vrc 400 instructions...

Hi I resently installed a Vaillant 438 with s plan. The customer had an old weather compensation unit with his old boiler and wanted the same set up with his new vaillant. I was recommended to use the VRC 400 from Vaillant themselves. I installed the VRC 400 unit as a room thermostat in...