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If the LEDs are dark during a call for heat or cool
a T4 or T6 Pro series model is required
making it suitable for steam and high-temp water systems
verify the 3A fuse and 24V transformer output
Utica-Dunkirk 550004286 Control Kit 320788-702 If the LEDs are darkThe Utica Dunkirk 550004286 Control Kit is an essential OEM electronic component engineered for the central management of residential and commercial hydronic boiler systems. This comprehensive kit serves as a direct upgrade or replacement for legacy control modules, specifically replacing Utica Dunkirk part number 550003502, as well as 550003746 and 550003185. It is designed for seamless integration with high efficiency condensing boiler series,
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