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Sounds like it MAY be a faulty aquasensor and plate heat exchanger. The first is covered by it's warranty, the second is not as it would be an installation fault that has caused it. Call the manufacturers, just make sure you have your documents i.e. completed Benchmark. It should be located in...

Don't use wd40. It's a mineral oil and will swell the seals and wreck them.. Good thing is, you've found you fault. You're now gonna need an engineer to fit you a ne water valve and servo valve. The unit may take a little setting up in order to make it work properly. Get an engineer that...

Does it fire up immediatley when you open the hot tap? What is the temperature control knob set to? What is the room stat set to? Behind the black plastic electric cover plate is a "Jumper" with a wire link on it. it should bridge a common pin to a number. What number is it on?

You've been given two tests to carry out. Get them done and feed back your findings first so we know what is working correctly..

You mean the left side?? The plastic cover is the electrics cover, but only do this if you're confident with electrics. No offence.

Locate the diverter valve. It is situated on the right hand side near the rear lower part of the boiler. It has two red microswitches attached to it. When you open the tap, it should move outward with both microswitches disconnected within approx 2 second when you open the tap. It should...

How are you having to reset it? If it is by switching the power off and back on, it could be the anti cycle failing to re-establish. Try removing the front enamel panel and find a silver screw on the electronic box with a +&- next to it. Remove the screw, and with a small electricians...

What is the model?

Link 3-4 will already be linked for ebus controls and so wont make any difference. Where is your weather compensator situated? Sounds like you might have water or condensation in it. I suspect it is the wireless photovoltaic version and so is probably accessible. If it is, you can remove it...

One problem is that no-one knows what the last engineer did. It does like the burner pressure hasn't ever been checked or adjusted as the seal is still fitted and these do have a tendency to creep up over time. It will need checking by an rgi that knows the vcw's It is very possible that the...

As far as I was aware, quite a few engineers had been doing some extra training on the older models earlier this year.

Had missed that you'd stripped the servo. Is the diverter valve moving outwards in both heating and hot water mode? Does the cam behind the servo move when you open the tap? If yes to both above then yes it's most likely the servo is reassembled incorrectly as Bunnyman has said, of which the...

To be honest buddy, if you're not sure which pipes they are, maybe you should get your heating engineer to take a look at it. He'll know exactly what to do. :?

You can try closing the isolation valves on the heating flow and return from the boiler over night to see if it still loses pressure. If it does then it's the boiler. If it only loses pressure when you re-open the valves, it's the system. Remember to ensure the boiler isn't going to try and...

Sounds like the a.p.s. Is faulty. You need a decent engineer that knows vaillant boilers to come and fix it for you and check the rest of the boiler through, but not the engineer you recently had as he clearly didn't fix it the first time. If you're having trouble with this part, it may well...

When the green light is flashing and you saw S33, did you here the fan running?

Sounds like it may need a part, and possibly a diverter valve and It's well worth getting your service done. They need an annual inspection, and if it hasn't been checked for a while then I'd strongly suggest it. What I would say is, get someone that knows their stuff on vaillant boilers, There...

If it's saying S23, it's either since fired up or it's lockout out. Which did it do? It may be obvious but I guess you've checked your programmer and roomstat.

Press (i) on the 4 button display. What does it say?

The pipe layout is. Servo to diverter. Top connection on servo to top connection on diverter and other pipe is bottom to bottom. If they cross, they are wrong.