Worcester Greenstar 24i jnr

[Tarby32]

HI can you help please.
I'm stumped and worcester tech help are literally no help whatsoever.
I have a customer that has a 24i jnr combi that has an issue with the hot water so im after some advice please.

When the hot tap is turned on the water is hot for about 3 minutes then gradually the temp drops off to warm then luke warm then cold, yet the boiler is still running and the burner is still going. The heat isn't leeching into the heating system as i have checked and the Diverter valve stays in the up position and i have also checked the paddle for pinholes.

The plate heat exchanger was changed about a month ago and a combi mate was also fitted as they had no scale protection.
Both temp sensor resistances have been checked whilst on the phone to tech help and according to them were correct.

The flow speed does not change at the tap when the temp is dropping. I did notice that the bypass stays relatively hot but am not sure what would cause this.
Any advice would be gratefully received

Terry

 

[Gas2Air]

Blocked P2P. You say it was changed? Or was it cleaned? If so then boiler sludge. The bypass gets hot for a reason, it's doing it's job.

 

[Tarby32]

Thanks for the reply.

Plate heat exchanger was changed , So a flush would sort it or would you recommend taking out the hydraulic block and cleaning each part ?

 

[Gas2Air]

Thanks for the reply.

Plate heat exchanger was changed , So a flush would sort it or would you recommend taking out the hydraulic block and cleaning each part ?

Don't pee about taking that mother out, flush it.