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[aaronjb]

I have the opposite problem with mine in the new house (a Vaillant); the hot water is piping hot and plentiful but the rads only get to about 35-40C.. and the boiler is in the loft that this fat bas..git can't get into.

[STEMO]

I have the opposite problem with mine in the new house (a Vaillant); the hot water is piping hot and plentiful but the rads only get to about 35-40C.. and the boiler is in the loft that this fat bas..git can't get into.

Weird things, Vaillants. I was feeling the cold this morning so turned the stat up from 20 to 22. The target temp for the CH is 75 degrees (the max). It always kicks into life with a really low flame and stays that way, with the temperature gradually creeping up, for about 20 minutes then, all of a sudden, the burner comes to life and the temp gets up to 75. That's where it's sitting now.
If I turn the stat back down, and the decide it's cold, it will go through this 'warming' cycle again.

According to the forums, it's normal. 

[STEMO]

Also, not just any CH engineer wants to try to service them, either.

[TD]

I have the opposite problem with mine in the new house (a Vaillant); the hot water is piping hot and plentiful but the rads only get to about 35-40C.. and the boiler is in the loft that this fat bas..git can't get into.

Weird things, Vaillants. I was feeling the cold this morning so turned the stat up from 20 to 22. The target temp for the CH is 75 degrees (the max). It always kicks into life with a really low flame and stays that way, with the temperature gradually creeping up, for about 20 minutes then, all of a sudden, the burner comes to life and the temp gets up to 75. That's where it's sitting now.
If I turn the stat back down, and the decide it's cold, it will go through this 'warming' cycle again.

According to the forums, it's normal. 

Depends on the type of controller fitted to the boiler, I reckon.
My plumber doesn't fit any other type of boiler except Vaillant and he reckons mine is the only one he's fitted that does that.
But then mine is the only one he's fitted using a Vaillant controller with weather compensation. He normally fits other makes of controller.
Tho a gradual rising of the temp of the CH, probably saves gas and that's why it does it 

[tigers_gonads]

They usually have a mesh filter on the feed which supplies the hot water, they clog up with crudd.....the instruction manual shows one fitted to the cold water inlet.....

^^^^This^^^^

Had a similar problem with mine last year.

Remove the mesh filter (Carefully) 
Stick it in a bowl with some Cilit Bang or similar for a few hours.
Give it a good brush with a nail brush then flush out under the tap.
Rebuild
Happy days 

[biggriffin]

They usually have a mesh filter on the feed which supplies the hot water, they clog up with crudd.....the instruction manual shows one fitted to the cold water inlet.....

^^^^This^^^^

Had a similar problem with mine last year.

Remove the mesh filter (Carefully) 
Stick it in a bowl with some Cilit Bang or similar for a few hours.
Give it a good brush with a nail brush then flush out under the tap.
Rebuild
Happy days 

Use white vinegar.

[Andy H]

I have the opposite problem with mine in the new house (a Vaillant); the hot water is piping hot and plentiful but the rads only get to about 35-40C.. and the boiler is in the loft that this fat bas..git can't get into.

Weird things, Vaillants. I was feeling the cold this morning so turned the stat up from 20 to 22. The target temp for the CH is 75 degrees (the max). It always kicks into life with a really low flame and stays that way, with the temperature gradually creeping up, for about 20 minutes then, all of a sudden, the burner comes to life and the temp gets up to 75. That's where it's sitting now.
If I turn the stat back down, and the decide it's cold, it will go through this 'warming' cycle again.

According to the forums, it's normal. 

Depends on the type of controller fitted to the boiler, I reckon.
My plumber doesn't fit any other type of boiler except Vaillant and he reckons mine is the only one he's fitted that does that.
But then mine is the only one he's fitted using a Vaillant controller with weather compensation. He normally fits other makes of controller.
Tho a gradual rising of the temp of the CH, probably saves gas and that's why it does it 

I fitted a Vaillant  combi and the weather compensator.
It does start gently before building up to full output but it doesn't take 20 minutes.

The Vaillant boiler has hundreds of software settings that allow the boiler to be set up in weird and wonderful ways - I will have a look and see if there is a setting to control how long it takes to reach full throttle.

[STEMO]

Thanks, Andy. There is an installers menu, or something, but I don't know how to get into it. It was already installed when we moved in, but no instructions.

[Sir Tigger KC]

Thanks, Andy. There is an installers menu, or something, but I don't know how to get into it. It was already installed when we moved in, but no instructions.

I expect you could find the user manual online, as EverReady kindly found mine. 

[STEMO]

Thanks, Andy. There is an installers menu, or something, but I don't know how to get into it. It was already installed when we moved in, but no instructions.

I expect you could find the user manual online, as EverReady kindly found mine. 

I've looked at it. Remember the instructions you used to get with Japanese cameras? 

[STEMO]

I reckon this is the fella, not much help, really.

[Andy H]

Thanks, Andy. There is an installers menu, or something, but I don't know how to get into it. It was already installed when we moved in, but no instructions.

This looks like the installers guide for your boiler https://www.vaillant.co.uk/downloads/ecotec-installation-servicing-2006-261447.pdf

I can't see anything obvious that would cause a 20 minute delay so probably best not to mess with it.

[TD]

I reckon this is the fella, not much help, really.

Nope, that just resets a timer....if the burner is off but there is still a demand for heating...resetting it just makes the burner come back on without it waiting a period of time (this 'feature' is suppose to prolong the life of the boiler, so to keep resetting the timer is probably not a good idea)
But unless you have a weather compensator controller fitted, I don't see how this would happen in your install, as your CH temp is set to 75C, unless your rad stats are shutting the rads off before the room stat knocks the boiler off.

All the 'good' bits to play with are under the installer menu....and probably best to leave alone unless you really understand what they do 

[STEMO]

My installer menu is just a zero at each level. Obviously done when it was put in. It's working fine, and I do like to 'fiddle about' with things, so maybe it's best I can't get to it. 

[STEMO]

That's not quite correct. In the installer level there are two digits flashing. It asks me to enter the level and I can go up in ones by pressing the + button, but it won't let me press 'enter'. No matter what digits are showing, they just keep flashing and the enter button does nowt.