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Bosch Worchester Greenstar Boiler

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BigRooster | 18:25 Tue 21st Apr 2015 | How it Works
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Last year I posted a question about my Bosch worchester greenstar boiler going hot cold when running shower . I changed thermostatic mixer but made no difference.. Once the colder weather came in and heating went on it seemed to have cured it self. But now the weather has warmed up and heating off shower is going hot and cold again so I'm hoping someone has some thoughts on what's going on .
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Does it go hot again spontaneously or do you have to press the 'reset' button?
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Makes no difference if I press reset just strange it's ok when heating is on
Sorry, I can't help - it is a different problem to the one ours has.
Good luck
Question Author
Shall we say that if the shower going for 10 mins it will go cold for about 30 secs maybe 3 times in that period
From the symptoms it could be a blocked heat exchanger....or the HE temperature sensor.If you're not on a contract sign up for one and call them out after a few weeks.
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How much do you think it would cost for a heat exchanger to be replaced with out a contract
How old is the boiler?.The HE is the single most expensive part and could cost between £300-£450.When was it last serviced?.What model is it?
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Bosch worchester greenstar si/junior serviced by British Gas last August no problems think it's about 9 yrs old
Call a local WB installer,It may be something simple.Dont use anyone not experienced with WB.
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Agree anything to do with gas leave it to experts
Rooster...its a given that a Gas Safe engineer must be used .....just make sure your guy is experienced in Worcester Bosch or you may end up paying for parts you dont need.

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