Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler isn't
lit and hasn't been doing CH for quite a while. That is, the radiator
without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last few
minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the boiler
is - but it seems strange to have something running when the boiler isn't.

Cheers

Dave R

"David.WE.Roberts" wrote in message
...
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler isn't
lit and hasn't been doing CH for quite a while. That is, the radiator
without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last few
minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the boiler
is - but it seems strange to have something running when the boiler isn't.


Probably circulation pump.
Even when the boiler is not firing the pump runs. How else can the boiler
thermostat get a true reading?

"David.WE.Roberts" wrote in message
...
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler isn't
lit and hasn't been doing CH for quite a while. That is, the radiator
without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last few
minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the boiler
is - but it seems strange to have something running when the boiler isn't.


Pre heat option selected?


--
Adam

On Mon, 03 Mar 2014 19:40:17 +0000, ARW wrote:

"David.WE.Roberts" wrote in message
...
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler
isn't lit and hasn't been doing CH for quite a while. That is, the
radiator without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last
few minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the
boiler is - but it seems strange to have something running when the
boiler isn't.


Pre heat option selected?

It was but I pushed the Eco button and the whirring didn't stop.

Just turned it off for a bit then turned it on again.

It ran the start up routing and the temperature dropped from around 50C to
30C and it isn't whirring.

I will leave it and see if it whirs again after it has run some hot water.

Possibly just auto stirring itself when warm.

Just slightly disconcerting when it whirs for no apparent reason, and
keeps on doing it for a long time.

Cheers

Dave R

In message , David.WE.Roberts
writes
On Mon, 03 Mar 2014 19:40:17 +0000, ARW wrote:

"David.WE.Roberts" wrote in message
...
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler
isn't lit and hasn't been doing CH for quite a while. That is, the
radiator without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last
few minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the
boiler is - but it seems strange to have something running when the
boiler isn't.


Pre heat option selected?

It was but I pushed the Eco button and the whirring didn't stop.

Just turned it off for a bit then turned it on again.

It ran the start up routing and the temperature dropped from around 50C to
30C and it isn't whirring.

I will leave it and see if it whirs again after it has run some hot water.

Possibly just auto stirring itself when warm.

Just slightly disconcerting when it whirs for no apparent reason, and
keeps on doing it for a long time.

Cheers

Dave R
Does your room thermostat have a cycling option? Mine doe 3 time per
hour is the default, which reminds me must look up how to witch it off.
--
bert

On 03/03/14 18:14, David.WE.Roberts wrote:
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler isn't
lit and hasn't been doing CH for quite a while. That is, the radiator
without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last few
minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the boiler
is - but it seems strange to have something running when the boiler isn't.


Mine runs for a while after the hot water is turned off, I assume it has
to dump the hot water in the boiler somewhere. It also has a featur that
runs the pump very briefly once a day even when the CE is off to stop it
seizing.


--
djc

On Mon, 03 Mar 2014 19:40:17 +0000, ARW wrote:

"David.WE.Roberts" wrote in message
...
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler
isn't lit and hasn't been doing CH for quite a while. That is, the
radiator without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last
few minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the
boiler is - but it seems strange to have something running when the
boiler isn't.


Pre heat option selected?

Looks like that was probably it.

An oversight on my part not selecting Eco - we don't need pre-heat just to
save us 5 seconds when the shower is warming up.

Interesting that I had to power cycle the boiler to get it to kick in -
the boiler is now at over 50C and there is nothing whirring.

I wonder how much more electricity and gas is consumed by this pre-heat
option?

Cheers

Dave R

In article , David.WE.Roberts
writes
On Mon, 03 Mar 2014 19:40:17 +0000, ARW wrote:

Pre heat option selected?

Looks like that was probably it.

An oversight on my part not selecting Eco - we don't need pre-heat just to
save us 5 seconds when the shower is warming up.

Interesting that I had to power cycle the boiler to get it to kick in -
the boiler is now at over 50C and there is nothing whirring.

I wonder how much more electricity and gas is consumed by this pre-heat
option?

I can see the benefits of it for intermittent use of hot water in say
the kitchen. Hot water on to rinse hands or a few items in the sink then
off, then back on again 30s later to fill a basin. Without pre-heat
you'll get a few litres of still hot from the tap followed by a blast of
cold from the feed that came through before the boiler fired and came to
temperature, result a lukewarm basin of water needing emptied/wasted and
filled with usefully hot water.
--
fred
it's a ba-na-na . . . .

In article ,
"David.WE.Roberts" writes:
Worcester Bosch.

I just noticed that there is a fan or pump running when the boiler isn't
lit and hasn't been doing CH for quite a while. That is, the radiator
without a TRV is room temperature.

Can't remember when the hot tap was last run but it isn't in the last few
minutes.

So what is likely to be running?

Fan for flue?

Pump for water in the boiler?


I'll keep an ear on it - working in the airing cupboard where the boiler
is - but it seems strange to have something running when the boiler isn't.

My Keston fires up the pump and fan every 24 hours if it's
not been used, although that's only likely in the summer.
I think it's only for something like 20 seconds, although
I've never caught the whole cycle, just heard it finishing
a couple of times.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 04/03/14 16:28, fred wrote:
In article , David.WE.Roberts
writes
On Mon, 03 Mar 2014 19:40:17 +0000, ARW wrote:

Pre heat option selected?

Looks like that was probably it.

An oversight on my part not selecting Eco - we don't need pre-heat
just to
save us 5 seconds when the shower is warming up.

Interesting that I had to power cycle the boiler to get it to kick in -
the boiler is now at over 50C and there is nothing whirring.

I wonder how much more electricity and gas is consumed by this pre-heat
option?

I can see the benefits of it for intermittent use of hot water in say
the kitchen. Hot water on to rinse hands or a few items in the sink then
off, then back on again 30s later to fill a basin. Without pre-heat
you'll get a few litres of still hot from the tap followed by a blast of
cold from the feed that came through before the boiler fired and came to
temperature, result a lukewarm basin of water needing emptied/wasted and
filled with usefully hot water.

Does just the same with the pre-heat in my experience. Hot running, turn
off tap, turn on tap: the remains of the hot in the pipe, then a slug of
over-heated water that was in the boiler, followed by a cool down phase
as cold water enters the boiler which isn't quite fired up.
--
djc