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Why has my Honeywell CM921 thermostat lost patches of its display?

My Honeywell CM921 thermostat has lost much of its display and can no longer be programmed. I have changed the batteries (new but bought some time ago) which didn't work. I intend buying fresh batteries. Any other suggestions.

Irvin Saxton, July 2013

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home Fix label Heating label_important Home Heating Systems category Honeywell

Why has my Honeywell CM921 thermostat lost patches of its display?

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Why has my Honeywell CM921 thermostat lost patches of its display?

I can answer this question ...

Why has my Honeywell CM921 thermostat lost patches of its display?

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