Turn off pre heat water on boiler

northwest1965

Do I have this correct? If I want to turn off the pre heat, the button needs to be illuminated? If so, how come the boiler cuts it every now & again??

BUFF

what model boiler do you have?
Do you have a programmer with hot water "on" period(s) set?

northwest1965

Its a greenstar 24 i junior

pseudodox

I keep my boiler in eco mode (ie not in hot water ready mode).  However the boiler itself fires up every so often even when not in use as a safety feature to prevent the pump seizing up.  It only runs for a very short burst & the cost is not measurable but it does prevent possible expense of a pump repair/replacement.  Been there, done that in the past when I neglected to manually run a previous boiler once a month or so through summer & the pump seized.

It should be mentioned somewhere in your boiler user guide.

HumberFlyer

If you want no preheat.... then you want no green light

northwest1965

HumberFlyer said:

If you want no preheat.... then you want no green light

That's not how the instructions read above though is it?

C_Mababejive

When ECO is active, the button is illuminated.
For all of those who have combis, if you find it a pain and find yourself waiting ages to get water at your tap, simply turn the tap on at a lower rate. This will signal the boiler to fire, consuming 20-30Kw as it does, the lower flow rate holds the water in the boiler longer and therefore picks up heat quicker and delivers it to the tap quicker. 

MikeJXE

That would be good if if it was possible, my boiler Ideal Isar HE35 is set to pre-heat and cannot be turned off, doing some exercises by having it on as normal for a day and switching it off at the wall for a day makes a difference of 8kWh per day, thats £24 a month for nothing when you don't need any hot water. 

vic_sf49

I have a different sized version of that boiler, but the buttons are identical.

Eco mode = green light on =  pre heat off.

So you were spot on @northwest1965.

If I have a power cut, even just a smidge of a second, I have to turn Eco mode back on again.

northwest1965

vic_sf49 said:

I have a different sized version of that boiler, but the buttons are identical.

Eco mode = green light on =  pre heat off.

So you were spot on @northwest1965.

If I have a power cut, even just a smidge of a second, I have to turn Eco mode back on again.

Cheers! Wonder why I hear it cut in then?

pseudodox

northwest1965 said:

vic_sf49 said:

I have a different sized version of that boiler, but the buttons are identical.

Eco mode = green light on =  pre heat off.

So you were spot on @northwest1965.

If I have a power cut, even just a smidge of a second, I have to turn Eco mode back on again.

Cheers! Wonder why I hear it cut in then?

Re: cutting in - read my reply above.

My manual says
Pump anti-seize function
Every time the pump is switched off (after a demand) a timer starts and if after 24 hours the pump has not run again it is switched on for 10 seconds.

I only turn the boiler on when I want heating, otherwise it stays off, with just the hot water on demand functioning.  My use of hot water from the boiler is erratic so I hear it jump into action every now and again as per above.