Honeywell THM5421R1021 IAQ Equipment Interface Module

Product Information

Use the Resideo Pro App to install T6 Pro Smart Thermostat in homes, which will associate those homes to your company. To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. This dependable module uses advanced communication protocols that help improve control of the HVAC system.

When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Thinking, I may have a defective unit, I exchanged it -- but now the replacement is doing the same thing. We make it easy and affordable for professionals and homeowners alike to find discounted air conditioning parts and wholesale heating system supplies. As long as I know other installers have conected both the batteries and the 24V at the same time without causing any damage, then for me this issue is laid to rest.

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It looks like we can consider this one complete, so I will lock the thread shortly unless I can help out with anything else.Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again.

At Cold Air Central, we pride ourselves on being a trusted authority in the world of HVAC supplies, equipment, and parts. I kept the red wire where it was, but switched the white wire from the W to C-terminal on the thermostat and to the "common" terminal in the boiler room (inside a TACO 406 ZVC).Then you'll be able to select which homeowners see your logo based on the pricing per household (consumer will not be charged).

Whether you're in need of HVAC troubleshooting parts for a system that's not cooling, seeking out seasonal HVAC maintenance kits for summer AC repair parts and winter heating system upgrades, or simply looking for the best parts for AC repair and HVAC upgrade kits online, Cold Air Central is your go-to source. There is also another small circular lithium battery in the stat which the manual says keeps the date and time intact. Applications include Gas, oil, electric, heat pump, forced warm air, hot water, steam or gravity systems. Powered by reliable RedLINK® technology, the Honeywell Home Equipment Interface Module works with up to 3 heat/2 cool pump systems. Equipment Interface Module controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system.I'm not impressed by honeywell either as I have written to them several times and I never get any responce. My current Honeywell visionPRO IAQ (TH9421C1004) thermostat is not working as the touchscreen is somewhat dead and unresponsive. Discover indoor and outdoor LED lighting options from undercabinet to ceiling and vanity, you can trust Bright33 for convenience, quality and value.