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NEW Honeywell Home THM5421R1021 Equipment Interface Module 85267328180 | eBay
69-2739-07 - Prestige® IAQ with Equipment Interface Module
Thos. Somerville Co. | Honeywell Prestige® IAQ Equipment Interface Module Kit, For Use With All THX9421R5021 Prestige® 2-Wire IAQ Thermostat and all Versions of Prestige® IAQ Thermostat and the VisionPRO® Thermostat with
My Honeywell Thermostat THX9421R5021 has a sensor near it. The screen told me to replace the battery in the sensor and I
How To Replace Outdoor Honeywell Thermostat Sensor Battery - YouTube