Boiler wouldn't turn off

seamusmacc

Hi guys, we having an issue with the new gas boiler we just fitted in.
Basically the boiler will keep on boiling even though it reach a certain temperature, the only way to turn it off is to turn off from the timer or reduce the temperature setting from the control knob on the boiler (let say I switch it back from 4 to 3), once it cool down, the boiler automatically switch it back on, and again it wouldn't turn off even though it was hot. Any ideas what might causing this?

btw, its a worcester condensing boiler

Many thanks in advance.

Billy Bunting

Who fitted the boiler ?

seamusmacc

Billy Bunting wrote: »

Who fitted the boiler ?

an RGI installer, was on the phone with him earlier and he will call around next evening to have a look at, though I have a feeling its some wiring issue, maybe I am wrong.

Billy Bunting

You say its shutting down on stat if you turn it down, are the rads and water getting hot enough ?

seamusmacc

Billy Bunting wrote: »

You say its shutting down on stat if you turn it down, are the rads and water getting hot enough ?

Yes, the rads were hot enough. I left it on for 3-4 hours and it wouldn't switch off, not for once.

Billy Bunting

If you run it at 2 what happens ?

seamusmacc

Billy Bunting wrote: »

If you run it at 2 what happens ?

Actually, I haven't tried that at 2. Though last evening I switch it to 5, and it kept on burning and the rads were way too hot, after half an hour, I turn it down manually.
I reduced the room thermostat by 2 degrees, from 22, 20 to 18C and etc etc, nothing happen. When it turned to 10C, the boiler switched off.

DGOBS

Could be a dodgy thermister (temperature sensor) fooling the boiler into thinking it requires 'frost protection' this will make it fire to high limit with no demand.

seamusmacc

DGOBS wrote: »

Could be a dodgy thermister (temperature sensor) fooling the boiler into thinking it requires 'frost protection' this will make it fire to high limit with no demand.

Thanks DGOBS, I will bring it up to the installer when he call in tomorrow. Cheers

seamusmacc

Billy Bunting wrote: »

If you run it at 2 what happens ?

Hi Billy Bunting, thanks for your reply and I had just turn it at 2 from 3 and it switch off.

corkgsxr

bet ya he forgot to take out the connector for when your giving it a permenant live

seamusmacc

corkgsxr wrote: »

bet ya he forgot to take out the connector for when your giving it a permenant live

Hi corkgsxr, thank you for reply. And I'm sorry for asking a daft question as the boiler thing is kind of new to me. What do mean by the connector and permanent live? Cheers

corkgsxr

seamusmacc wrote: »

Hi corkgsxr, thank you for reply. And I'm sorry for asking a daft question as the boiler thing is kind of new to me. What do mean by the connector and permanent live? Cheers

depending on how ya wire them theres a link that needs to be taken out or not.

most gas boilers always have a permanent live. for pump over run and stuff, on combi boilers so the boiler can cut in on demand.

switched live turns on the heating from your heating controls.

the worcherster come with a link that if you forget to take it out will keep running unless you turn off the main power switch.

seamusmacc

corkgsxr wrote: »

depending on how ya wire them theres a link that needs to be taken out or not.

most gas boilers always have a permanent live. for pump over run and stuff, on combi boilers so the boiler can cut in on demand.

switched live turns on the heating from your heating controls.

the worcherster come with a link that if you forget to take it out will keep running unless you turn off the main power switch.

That's a very good point, thank you very much for pointing this out. Does it make any difference by leaving the link behind as I am able to reduce the temperature by turning the knob on the boiler? The boiler was temporary turn off until the temperature drop to a certain level and automatically switch back on.

Come to think about it, he replaced the original cable that come with the boiler with 4 connections (i.e. Life, Neutral, Earth and an extra connection that I wouldn't have a clue where did he connect to).

DGOBS

Corkgsxr, would agree with your thoughts on that one, but it should still have temperature control for the boiler, but more likely that a thermister on a new boiler.

Or for non-system boilers, a pump the wrong way around would lead to little or no temperature control

seamusmacc

Hi lads, thanking you all for you inputs.
The man was over here this evening and said there is nothing wrong with the connections as he did take care of the link while he was installing it nor the thermistors as the light will be flashing if they are faulty.
He reckons that the boiler stays on all the time is to maintain the same water temperature in the system, and said that's the design of the boiler. He shown it to me by switching off the mini vent from the room thermostat by reducing the setting to 10C, and the boiler turn off.
He is not 100% sure though as he's only fitted a couple of them before. He said one of his relative had exactly the same model and he called around last evening to have a look at it and said their boiler behaves the same and would never turn off.
I look through the manual and there is no information in relation about this behaviour, but it did say the boiler will shut down if water temperature is 5C above setting value. By saying that, when I reduce the temperature from the knob on the boiler, the boiler does shut down.
Anyway, I questioned him how is that possible to save money then by keeping the boiler on all time? He said it would be better to call the Worcester next Monday to find out then. He is not 100% sure himself either. Anyway, one way or the other I will call Worcester on Monday to clarify this.
Btw, the model is "Greenstar 24i System", I'm wondering any one of you guys know anything about this?

Cheers and thanks for reading this.

corkgsxr

Has to be wired wrong.

Iv installed loads of them with all sorts of controls.

They don't come on unless called by some sensor or hot tap.


2 things to try.

Press the eco button and see does that stop it. ( so the light is on)

And if you cut down the stat to stop the boiler. Will the hot water come on when you open the tap



Sorry before I presume stuff, is it the 24i junior combi?

seamusmacc

corkgsxr wrote: »

Has to be wired wrong.

Iv installed loads of them with all sorts of controls.

They don't come on unless called by some sensor or hot tap.


2 things to try.

Press the eco button and see does that stop it. ( so the light is on)

And if you cut down the stat to stop the boiler. Will the hot water come on when you open the tap



Sorry before I presume stuff, is it the 24i junior combi?

Hi corkgsxr, its Greenstar 24i System gas boiler, please see http://www.worcester-bosch.ie/installer/boilers/gas-boilers/greenstar-24i-system though it comes with combi option, he didn't connect the hot water system and the hot water still heat up in the cylinder.

thanks

corkgsxr

seamusmacc wrote: »

Hi corkgsxr, its Greenstar 24i System gas boiler, please see http://www.worcester-bosch.ie/installer/boilers/gas-boilers/greenstar-24i-system though it comes with combi option, but he didn't connected the hot water system and the hot water still heat up in the cylinder.

thanks

That one doesn't have a combi option.

Can ya take a pict of the pipework that connects to be boiler?

seamusmacc

here you go

corkgsxr

I think it's wired wrong. Prob better to get a sparks to look at it, I doubt he knows what's wrong.


Only reason they fire on there own is if boiler temp drops below 5 degrees it'll fire to protect itself.

Is your house lower than 5 degrees?

seamusmacc

corkgsxr wrote: »

I think it's wired wrong. Prob better to get a sparks to look at it, I doubt he knows what's wrong.


Only reason they fire on there own is if boiler temp drops below 5 degrees it'll fire to protect itself.

Is your house lower than 5 degrees?

Hi corkgsxr, thank you very for your time.

Yeah, will ring worcester next Monday to find out, probably they need to send an engineer over.

No, so far the house is never lower than 5 degrees.

corkgsxr

When you turn the stat down and the boiler stops, do all the lights go out in the boiler or does the centre light stay on

seamusmacc

corkgsxr wrote: »

When you turn the stat down and the boiler stops, do all the lights go out in the boiler or does the centre light stay on

Only the blue light (centre light) stays on when I turn the stat down and the boiler stop.

kanji

I think from the information you've given us that the boiler is probably working correctly

The Worcester is a modulating boiler meaning as the temperature increases the flame decreases. This would mean that although you see the green flame light on there might be only a very small output from the boiler

This would especially be true if the boiler size is pretty spot on for your heating system

So could you confirm if the boiler only comes on when the timer and thermostats are calling for heat?

Also if you have a zoned heating system could you try just heating the hot water on it's own and see if the boiler flame cycles on and off with a reduced load?

In saying that I would still recommend getting a Worcester service agent to check the boiler to make sure everything is correct, if only for your own peace of mind.

Hope this helps, Neil

seamusmacc

kanji wrote: »

I think from the information you've given us that the boiler is probably working correctly

The Worcester is a modulating boiler meaning as the temperature increases the flame decreases. This would mean that although you see the green flame light on there might be only a very small output from the boiler

This would especially be true if the boiler size is pretty spot on for your heating system

So could you confirm if the boiler only comes on when the timer and thermostats are calling for heat?

Also if you have a zoned heating system could you try just heating the hot water on it's own and see if the boiler flame cycles on and off with a reduced load?

In saying that I would still recommend getting a Worcester service agent to check the boiler to make sure everything is correct, if only for your own peace of mind.

Hope this helps, Neil

Hi Neil, thanks for your inputs. Just to confirm that the boiler only comes on when the timer is calling for heat, in my boiler setting, I wouldn't be to use the thermostats to switch the on the boiler as its only switch on when the timer is on or I switch it on manually.

Its no zoning system, so I wouldn't be able to do that either.

Anyway, I will give Worcester a call on Monday to see what the story is.

Cheers, thank you very much for your help and enjoy the rest of the weekend.

kanji

You could try turning off all the radiators at the radiator valves to prove the flame cycling either

Still it sounds like the boiler is working correctly to me

seamusmacc

Hi there, thank you very much for your help.
Neil, and you are right, The Worcester men were over here this morning, and said the boiler modulating the heat once it reach a certain temperature and claimed its more energy efficient than turning it off and back on again.

Cheers