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?

gareth wrote:
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?)


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.

In message , The Natural Philosopher
writes
gareth wrote:
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?)


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,

They're running out of manufacturers to desert

and five years later no one can understand why the company is going
down the pan.

Potterton (sorry, Baxi) are still trading


--
geoff

On 01/04/2011 13:26, gareth wrote:
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?





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