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Hello, the CM907 is a wired thermostat, not wireless, so you won't need to pair it.Have you checked the batteries? It could simply be that they need to be replaced.
The nearest equivalent to the CM907 is the ST9100C. There's also a T4, which has Honeywell's newer look and a different style of user interface.I wouldn't buy any secondhand thermostat, and I probably wouldn't buy any thermostat on eBay. Screwfix sell the above two that I mentioned, if you struggle to find a good plumbers' merchant.You can install a wireless thermostat but they're more expensive and, again, I wouldn't buy on eBay. The nearest equivalent wireless stat is the CM927.