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info Honeywell
Status dor
Door reporting verification mode for entry door status.
? What Causes This
User entered SERVICE MODE to verify entry door communication.
ⓘ What This Means
Select dor using UP/DOWN arrows and press MODE to display door status value, then perform door open/close verification steps.
Source: page 38 of the official manual
From the manual
This error code appears in:
Honeywell Thermostat Battery