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Andrew Smith
Andrew Smith, Home Appliance Technician
Category: Appliance
Satisfied Customers: 3723
Experience:  Gas cooker specialist
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I have a Heatline Vizo 24 boiler which will not maintain DHW

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I have a Heatline Vizo 24 boiler which will not maintain DHW temperature. The burner cuts out and restarts during hot water demand Central heating works fine. Could this be caused by the DHW sensor being faulty?
Does the water get really hot?
Does yhe boiler get really hot?
Does it maintain the temperature better when the tap is running faster?
Customer: replied 28 days ago.
Not really. It heats up normally until the burner cuts out.
Customer: replied 28 days ago.
No, it is better when the water runs slowly.
temp ok but just cuts out when tap still running?
Customer: replied 28 days ago.
It sounds like your plate heat exchanger is scaled up and unable to pass the heat into the water as it passes through the heat exchanger so the boiler reaches temperature and shuts down as the return temperature comes back hot.
Customer: replied 28 days ago.
I replaced the plate heat exchanger 6 months ago along with the main heat exchanger.
Could it be scaled up again?
You can clean them.
Customer: replied 28 days ago.
OK
Dip in a bucket of descale for 30 minutes and it will come out shiny again
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