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Well after having changed the shower and the problem still occurring in much the same way. It would suggest that it's the boiler or at least an interaction with the boiler when flow is reduced slightly like during a shower. That doesn't seem like a huge leap to make. The only bits that weren't...

Just to add...when I replumbed the new shower I changed the crappy isolaters that were in the hot water feed from the boiler to full bore isolaters.

Had a shower. I estimate it went cold after about 8-10 minutes. Jumped out and left it running. It restarted by itself after about 3 minutes at which point I switched it over to to the shower hose end with head not attached. Left it running 10-15 minutes and boiler stayed running with hot water.

I fitted it. It was just the shower valve.

The trouble is it takes ages to check and repeat and seems internittant so not confident if it doesnt run cold. Difficult to find time with work and then kids in bed from 7. The shower had done 9 years of service. Also none of the parts were available for it. I was confident it was the shower...

When it goes cold, I check the boiler and the green burner light is no longer lit. So on that basis I ruled out diverter motor and heat exchanger. It's makes noises as though it's trying to relight. It's just had a service and new electrodes but still doing it.

Bought a new shower. All started off well but it's going cold again now. Any more ideas?

That's correct yes

Its one like below. Maybe a non return valve inside the body then? Might just need to get a new one like for like. It's done 9 years of service. Thanks for all your help with this.

OK. More info. If I continue to run the shower and observe the boiler. Boiler does lots of relay clicking and fan sounds and after quite a few attempts the burner led illuminates again. I was able to hold my hand on the hot feed pipe to the mixer from the boiler and as it the boiler was...

From memory it's always been able to put out HOT water (uncomfortable to put hands under hot tap) What is excessive? I will experiment today, running hot water from tap for prolonged periods and report back. What does it mean if its just the shower that after 5 mins makes the boiler burner led...

Just tried to get the boiler to drop out. Had a shower until it dropped out (dropped out after 5 mins). Turned it off and back on and ran just hot water tap and it didn't drop out this time (about 10 mins). Not sure what this means?...if anything? Thanks.

I have a Worcester Bosch 28i. The last couple of days I have been in the shower for a few mins then suddenly lose hot water. When I jump out and take a look at the boiler there are no errors but burner light is out. I have been turning boiler off and on so I can continue my shower but will run...