Showed runs fit 20 secs then stops

Mira advance atl flex only 15 months old . Regardless of temperature it runs for about 20 secs then flow drops or stops completely and reset light and alarm sound.
Asked 3 years ago by Stephen Wyatt, Dorset
Sounds like a faulty relay board or flow valve, which should be under warranty still.

Answered 3 years ago by Barrie Seabright

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