Well one day I came home (later than my other half) and found the DTS92 that normally sits on one of the loudspeakers in the living room disassembled...
Personally I don't think a DTS92 will solve your problem, if one end of the room is always colder than the other due to it being so long and one end...
The egg timer just means it hasn't received any transmissions from the temperature sensor in the zone since the controller was rebooted, as they are...