Unreliable Vaillant boiler

[gareth]

Sorry, can't find the original thread.

The faulty part was a rubber expansion hose positioned right next to the heat exchanger. (Who do Vaillant employ as engineering designers? The lavatory cleaners?)

The replacement part is a telescoping pair of copper pipes, with O rings completing the join.

But, now that it is working, once the system has come up to temperature and slips into anti-cycling mode, there is a strong resonance vibration that is audible right through the house.

Is this to be expected?

[The Natural Philosopher]

I suspect it goes more like

1/. Engineer designs boiler with high spec hose. 2/. Buyer gets tasked with cost reducing product, and sources cheap piece of crap 'I mean, a hose, is a hose, is a hose, innit?' 3/. When failures come in accountant says 'well its lasted the warranty period, so what? 4/. Customers desert in droves, and five years later no one can understand why the company is going down the pan.

[Malcolm]

When my virtually new Vaillant started 'buzzing' when switched on from overnight cols (only for a couple of minutes a short time after firing up), my installer called the Vaillant engineer who made a small sotware adjustment and cured the problem. Totally reliable since then.

Malcolm

[geoff]

They're running out of manufacturers to desert

Potterton (sorry, Baxi) are still trading