boiler fires on and off constantly - Biasi Riva

For both h/w and c/h the boiler will fire up for 3 seconds then stop for two seconds, fire up for 3 seconds then stop.. constantly. This appears to have occurred overnight. It is a Biasi Riva, five years old.

I replaced the h/w heat exchanger a year ago due to limescale, but even before then the c/h was fine and the problem was gradual.

Any ideas very welcome. Please post to group, I do not check that email address.

Many Thanks J

Reply to
Jon
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From cold, or only when hot?

Reply to
Ian Stirling

If the pump had failed, then running for 3/5ths of the time would result in obvious boiling.

Reply to
Ian Stirling

In message , Jon writes

Have you checked a) the temperature sensor, and b) that you don't have a blockage restricting the flow, or your pump has failed????

Reply to
raden

- From cold

- The flow is still good

- How do I check the temperature sensor

- How do I check the pump?

Thanks J

Reply to
Jon

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