Boiler acting strange during DHW

17 Nov 2005
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United Kingdom

we have a vaillant 242 combi boiler

the problem is that the boiler is acting weird as when we turn on the DHW, the boiler fires for a while, then cuts off and then fires again it keeps doing this as long as the DHW is on

any idea what we can tell the plumber to look at ? rather than him changing 5 parts we can tell him to start off by changing the one we suspect and take it from there

thanks in advance
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Our advice would be to engage a decent heating engineer, rather than a plumber.

It sounds as though your plate heat exchanger may be blocked.
The other thing is to pay him to diagnose the fault.

Never agree to pay for new parts which are not required to fix faults.

A good boiler engineer will be able to diagnose the faulty part and not just give you a list of new parts for YOU to buy for HIM to try!


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