I think you may have the model # incorrect, However if you have a thermostat as in the type that are hand held, polarity of the batteries is the 1st thing I would check, then test them for proper voltage, corrosion will often interrupt that small of a voltage, clean the terminals and test it .
A wall mounted like a central HVAC system typically will not require batteries to operate, this is for memory and they will work fine even if no batteries are installed, however there are battery powered stats too, meaning non parasitic type that not powered by the transformer in the air handler.
I will include a basic drawing of a residential HVAC thermostat to show you how the 24 volts powers most thermostats.
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Hunter Air Purifiers > Hunter 30124 HEPAtech 124 Air Purifier w/ Ionizer
Hunter 30124 HEPAtech 124 Air Purifier w/ Ionizer
Item #: hun30124
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