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info Honeywell
Status bnd
Reverse Binding mode initiated for RF device pairing.
? What Causes This
User pressed FAN button to initiate binding process with RF devices like S541.RF.
ⓘ What This Means
Press S1 switch on the S541.RF to start the binding process. Device LED will flash and e7w will beep to confirm successful binding.
Source: page 38 of the official manual
From the manual
This error code appears in:
Honeywell Thermostat Battery