Worcester Greenstar 30i erp DHW problem

[ladybreaker]

Not been very lucky with the above boiler and supposed to be one of the best for the money I paid for.
Fitted Jan 2019, just before the year warrant expires the boiler start leaking around the heater exchange and was repaired by Worcester engineer under warranty.
Today DHW problem, CH is fine, open cold tap boiler fire up as normal i can see temp going up on the front display DHW temp is set to 50 degree, but burner are on till it reaches 90 degree and then stops. If tap is left open the burner will fire again when temperature goes down to 60 degree and stops again at 90 degrees and same cycle is repeated again.

Any idea what is going on ? why is'n it stopping at the preset temperature of 50 degree ?
No error on display

 

[Stadan20]

More than likely the plate heat exchanger is blocked

 

[ianmcd]

Are you sure about the warranty ? these came with a 7 year warranty as standard, call worcester they will be able to tell by your post code

 

[Stadan20]

https://www.worcester-bosch.co.uk/guarantee-check/
Pop serial number in there this will tell you if boiler is in warentee or not

 

[ladybreaker]

expired 2nd Jan 2021
55708590025377733600005

 

[ladybreaker]

More than likely the plate heat exchanger is blocked

Will it be cleaned with in the boiler or has to be removed from system, and what is the average price to unblock it

 

[ianmcd]

where did you buy it ? short warranties are usually for new build housing where they buy many hundreds of them at a really reduced price, but with a small warranty period

 

[ladybreaker]

It was purchased on a benefit scheme

 

[Stadan20]

Will it be cleaned with in the boiler or has to be removed from system, and what is the average price to unblock it

Best to ask around as different areas vary on pricing . Company I work for won't even bother cleaning them as its not guaranteed so we just replace . That being said it could be another issue I.e diverter valve . Worcester do a one off repair for £290 I believe. They will fix anything wrong in the boiler

 

[ianmcd]

It was purchased on a benefit scheme

Ah that is why you only got a short warranty

 

[martyndc88]

Plate is blocked. 99.9%. It will have to be removed to clean.

 

[ladybreaker]

Plate is blocked. 99.9%. It will have to be removed to clean.

Yes it was the plate blocked, Worcester engineer came today and replace it.

Thank all for the input

 

[cdbe]

In a year! There must be some muck in your system.

 

[ladybreaker]

It has been flushed twice since installed ???