Worcester 28i junior- hot water but no central heating

[Sammi Brown]

flame shuts down, but still ignites for hot water demand

 

[Mickyplumb]

flame shuts down, but still ignites for hot water demand

I'm guessing then it's not gas lock out. If gas supply can run and keep up with hot water demand, then gas demand on heating demand should be a doddle. I think that if you remove the multiplug (CAREFULLY) from the PCB, then it will override any sensors, thermistors etc. I'm not sure how this helps diagnose but it helped me once on a junior. Let me think for 5 mins.

 

[diamondgas]

yes i just switched heating on ran for 4-5mins max , radiators upstairs got warm but downstairs didnt, then pilot goes out but still ignites when demand for hot water , no flashing lights

I'd be wanting to learn some history about your system Sammi Brown TBH! Has this just happened or been going on for a while? How long? 🙂 If recent then more likely to sway towards the pump, If there's an inherent issue then system design ... Are you/have you been filling the system periodically? those kinds of things make a difference when diagnosing circulation problems. Could be a faulty pump or a blockage somewhere. Not sure if these boilers have an integral filter on the heating circuit! If they do it may be as simple as cleaning that out 🙂

If your not comfortable working on the plumbing of the boiler I'd advise getting some one else in! There's a place on here [DLMURL="http://www.ukplumbersforums.co.uk/im-looking-plumber-gas-engineer/"]I'm looking for a Plumber or Gas Engineer[/DLMURL] where you can request help and then check out the respondants posts etc. to get a feel of who they are 🙂

 

[Mickyplumb]

I'd be wanting to learn some history about your system Sammi Brown TBH! Has this just happened or been going on for a while? How long? 🙂 If recent then more likely to sway towards the pump, If there's an inherent issue then system design ... Are you/have you been filling the system periodically? those kinds of things make a difference when diagnosing circulation problems. Could be a faulty pump or a blockage somewhere. Not sure if these boilers have an integral filter on the heating circuit! If they do it may be as simple as cleaning that out 🙂

If your not comfortable working on the plumbing of the boiler I'd advise getting some one else in! There's a place on here [DLMURL="http://www.ukplumbersforums.co.uk/im-looking-plumber-gas-engineer/"]I'm looking for a Plumber or Gas Engineer[/DLMURL] where you can request help and then check out the respondants posts etc. to get a feel of who they are 🙂

I'm thinking, these don't have a heating flow switch do they ? So, could it just be the pump packed up ? The upstairs rads maybe getting hot through gravitation ????

 

[Sammi Brown]

history is changed flow sensor 6 months ago as it developed a leak, other than that this problem has occured in the last month, changed fan due to it being faulty when checking initial problem , changed pcb which had some signs of problems dried cracked solder, prior to changing pcb had no hot water either but since changing pcb have ho****er now but no heating,

 

[Sammi Brown]

my thinking is pump just that yes i can feel some vibrations within but dont feel its enough to be functioning properly, was thinking diverter valve but with radiators upstairs getting hot more inclined to think that is working

 

[diamondgas]

my thinking is pump just that yes i can feel some vibrations within but dont feel its enough to be functioning properly, was thinking diverter valve but with radiators upstairs getting hot more inclined to think that is working

Diverter valve? We talking Worcester Greenstar Junior Sammi ?

 

[diamondgas]

I'm thinking, these don't have a heating flow switch do they ? So, could it just be the pump packed up ? The upstairs rads maybe getting hot through gravitation ????

I'm thinking it's a greenstar? 🙂 But you're dead right, although they'd probably overheat yeh?

 

[Mickyplumb]

history is changed flow sensor 6 months ago as it developed a leak, other than that this problem has occured in the last month, changed fan due to it being faulty when checking initial problem , changed pcb which had some signs of problems dried cracked solder, prior to changing pcb had no hot water either but since changing pcb have ho****er now but no heating,

Are you sure it wasn't the dhw flow switch that was changed ? And in yu last post you mention diverter valve. Is it a standard efficiency, ie not condensing ?

 

[zeebeedee]

Kaboom

 

[Mickyplumb]

Kaboom

LOL zeebeedee

 

[diamondgas]

Kaboom

Your brain just popped mate 🙂

 

[Sammi Brown]

its not greenstar that was later model , my model the 28i junior was discontinued in 2005, some slight differences,

 

[Sammi Brown]

and no its not condensing

 

[diamondgas]

its not greenstar that was later model , my model the 28i junior was discontinued in 2005, some slight differences,

🙂 you mentioned diverter valve Sammi, the older (your) version didn't have them, the newer condensing did! Hence some confusion! 🙂

 

[Mickyplumb]

and no its not condensing

Okay, so no diverter. That's a dead cert.

 

[Mickyplumb]

Can you not unscrew the vent screw on the pump and carefully stick a screwdriver in the top of the armature and see how much resistance is needed to slow or stop the pump. Experience will tell you what is right and what is wrong.

 

[zeebeedee]

What's the gc number?

 

[diamondgas]

I'm guessing 47 311 70 zeebeedee! 🙂

 

[Sammi Brown]

GC No- G20 47 311 70