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Honeywell BDR91 Wireless receiver.
For use with: CM Zone CMT927 Y6630D and other wireless devices using 868Mhz.
Model: BDR91T1004
Replaces: R6660D1041 (HC60NG) BDR91A1000 (BDR91A)
A red flashing light on a BDR91 wireless relay box can indicate a number of things, including a loss of communication or a need to clear binding data.
To clear binding data, press and hold the button on the BDR91 for 15 seconds until the red LED blinks rapidly. Then rebind the thermostat.