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Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience:  Heating and plumbing answers. 20 years experience
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Hi got a Biasi riva compact M90E that has very low D.H.W

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got a Biasi riva compact M90E that has very low D.H.W temperature even with the dial set to maximum. The bioler fires up for about 30 seconds then stops for about 5 seconds and starts back up again,. this causes the water to be either luke warm or cold
Plumberpro :

Hi . this is caused by a blocked domestic hot water cheat exchanger. The water can't get through quick enough and so overheats . boiler shuts down then starts again as the water cools.

Plumberpro :

Replace the domestic hot water heat exchanger.

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