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aircon & heat pump repair in birkenhead

I have a ducted ventilation system(heat & cool system) for a long time, the unit of the system is located on the rooftop of my house, and it is a central heat and cool system and ducted for the whole house. the unit as I know is branded "Carrier" , the model of the controller is Enerstat Programmable Heat Pump Thermostat Model HP-1N. It is an old model. I have replaced the whole unit when the time I moved in this house, but I didn't use the system. Recently, I found the battery of the Thermostat is gone. So I need a ventilation system expert who can replace the battery of the controller and check the unit for me, to see whether it is still functionable.