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Thanks Tony, i will drop them an email Piers

a little bit more difficult for me im affraid... need to speak to a moderator about gaining access... do you know who runs that part of the forum?

The operation of these sensors is pretty much the same throughout... there is a small hole in the bottom which allows water into a chamber inside the sensor. Inside is a plate which pushes against a spring. This spring then measures the distance the plate travels to indicate the pressure. They...

I'd like access to this locked section of the forum...

It's very unusual for the overheat stat to trip from cold. It's just a metalic strip that reacts to certain temperatures and breaks the circuit through it. So in answer to your question about the PCB it wouldn't be the issue, unless you are getting a good circuit through the harness and the...

Just one will do the job... the pressure is the water in the entire system so if you take some out it will reduce it on the entire system.

Yes, pressure in your system is just the amount of water, so too much pressure is too much water, and not enough pressure is not enough water. If you bleed a radiator and allow a small amount of water out each time you will eventually get it down to a suitable pressure. Usually between 1 and 1.5...

Thanks Tony, im neutral to any personal opinions as you can tell :) I will always put across a logical idea on any fault. On some products i can offer a bit more indepth information and assistance as you are already aware. Im no Vaillant expert so i certainly wont claim to know much about...

Are they getting any lock out failure on the lights? The HW thermistor will not be the cause of the problem (or very unlikely) as if it was, you would have a failure light on the front and the hot water would not work. It is just an NTC thermistor so it allows the PCB to see the temperature...

I dont mind people thanking me :) hopefully i can help you out if you ever need some advice ;)

i was partly agreeing with you if you look back. You correctly suggested that there are multiple parts that can cause the fault, which is the case. I was simply suggesting that people who do change all of the parts just for the sake of it arent really testing it correctly. You have clearly...

You're very defensive. I never suggested you are specifically a part changer. So a "blocked" hose isn't down to dirty systems... What's blocking it then? I referred to them as sensors in the plural tense because more than one person mentioned them. I don't know a huge amount about...

BG prices = Unbelievable

I do see what you're saying about looking incompetent, but at least you are actually acting as an engineer and testing rather than just changing all the parts it "could" be at a large cost. The chances of the pump, pressure sensor, tubes etc all failing at once are very slim. Its usually one...

Tony is right, there are many things that can cause the fault, it doesnt mean you have to change every part thats a possible cause... thats just guess work and throwing parts. Cleaning the sensors can solve the issue, as im led to believe its usually dirt/debris in the pressure sensor...

Tibbot is correct, it is extremely important to ensure that the flue is correct. The seal will be different, its operating temperature etc... it has to be the flue thats specific to the boiler

You're welcome... sorry i hadnt noticed it was posted such a long time ago! The flexicom is the nearest replacement for the ultimate. The flue can take the same route but it would have to be the specific flue for the appliance. They operate at different temperatures (on the flue gas side of...

no the software is different between the two, some of the functions dont work when you cross the brands. no they arent a more basic version, they are a different brand under the same group. They both serve the same purpose and do the same job. but with differences and similarities.

A high efficiency boiler works through modulation. It controls the rate at which it runs based on temperature. See it like you're driving and have cruise control. It can maintain a certain speed effectively. The same applies for the boiler. In reply to the comments about choosing Vaillant over...

What you think or don't think should be done, or what your conscience says you do is largely irrelevant. BG pay a rate, to contractors, to do a GENERIC service. That is all they want and require. 20 quid! inc. expenses. OUTER case off, dust & visual, FGA and gas rate/burner pressure. This is for...