Sundial 9420c RF has started switching its mode

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29 Jan 2020
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Been running fine since installed with my new Worcester boiler 4 yes ago. Recently I've discovered it's been switching between modes, eg auto to cont or once to off, or any other combination. Any advice? Is the unit itself likely to be faulty, or a symptom of a boiler problem maybe? Btw, I had the two way water/heating valve replaced a couple of months ago, don't know if this could be related?
 
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It's a wireless system , so I don't know if it's possible for another wireless system to be interfering with it?

Maybe your neighbours have had the same system installed?

As anything changed in your home when the problems started that could interfere with it?

Have you emailed Honeywell asking what the issue could be? Its probably cropped up before
 

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