Hot water running hot & cold -Vokera Excell 80SP

[jack_s]

My hot water keeps running hot then cold for a short period.

The boiler is a Vokera Excell 80SP, outside in a lean-to outbuilding.

It did the same 7 years ago.
Boiler engineer who fixed it then, said it was a blocked Venturi in exhaust outlet pipe on top of boiler.

He fixed in in 10 minutes, by removing pipe on top, cleared/cleaned the venturi, problem was solved.

I had a look at the boiler, but cannot see exactly where this Venturi is.

Anyone know where it is exactly ??
.

 

[jack_s]

I had a look at the boiler, but cannot see exactly where this Venturi is.

Anyone know where it is exactly ??

 

[Nixt]

The venturi is part of the air/flue system. The flue is safety critical and should only be dismantled by someone competent to do so. If your only experience is seeing it done once 7 years ago, you're best calling them again.

 

[jack_s]

My hot water keeps running hot then cold for a short period.

The boiler is a Vokera Excell 80SP, outside in a lean-to outbuilding.

It did the same 7 years ago.
Boiler engineer who fixed it then, said it was a blocked Venturi in exhaust outlet pipe on top of boiler.

He fixed in in 10 minutes, by removing pipe on top, cleared/cleaned the venturi, problem was solved..

Can you get access to the Venturi this way, from outside through exhaust outlet pipe ??
.

 

[spacethegas]

you have convinced yourself its that venturi haven't you.

 

[jack_s]

you have convinced yourself its that venturi haven't you.

It's happened before & it's a common fault.

What else do you suggest ??

 

[nickso]

you have convinced yourself its that venturi haven't you.

It's happened before & it's a common fault.

What else do you suggest ??

get it properly serviced, they rarely need much more.

 

[jack_s]

My hot water keeps running hot then cold for a short period.

The boiler is a Vokera Excell 80SP, outside in a lean-to outbuilding.

It did the same 7 years ago.
Boiler engineer who fixed it then, said it was a blocked Venturi in exhaust outlet pipe on top of boiler.

He fixed in in 10 minutes, by removing pipe on top, cleared/cleaned the venturi, problem was solved.
.

I did this, removed inlet/exhaust pipe, cleaned one venturi & it seems to have solved problem, but why ??

Took pipe off boiler, couldn't see anything inside the venturi pointing upwards.
There were a few bits of dust/dirt build-up on inside of this venturi, but nothing major.

Ran a thin screwdriver around inside of venturi.
Seems to have solved problem, water is not running hot/cold.

Surely a few bits of dirt in venturi wouldn't cause water to run hot/cold ??

Here are some pictures:

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• jack_s
• 13 Dec 2008
• 2

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• jack_s
• 13 Dec 2008
• 2

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• jack_s
• 13 Dec 2008
• 2

 

[nickso]

bet your fan is choked too.

 

[twgas]

bet your fan is choked too.

and if you didn't put it back together properly you and your family could suffer same problem as fan

 

[jack_s]

bet your fan is choked too.

What would happen if it is choked ??

The fan seems to be running ok, good airflow through flue.

 

[Agile]

The plain fact is that you are not competent to work on gas boilers and should call a competent CORGI to come and test it for safety.

Tony