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Flashing display on Utica MAC-150...

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john p_2
john p_2 Member Posts: 367
A friend of mine has a Utica MAC-150 Combi which intermittently has a flashing display screen. The screen is green in color when flashing.

There doesn't seem to be any other issues with performance of the boiler...working / operating perfectly otherwise. Any idea what might be causing this?