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My wireless CM927 programmer is missing. Can I just buy a replacement programmer and will it work with the existing receiver or do I need to buy a new receiver as well? Many thanks

I have moved into a property that has a new boiler but no programmer/timer. All we have on the wall is a Honeywell small square unit that has a button on it next to a red light. When you press the button the light goes green and the heating comes on and vice versa to turn the heating off...