Economiser. They have a thermal switch that opens at below a certain temperature to lock out a compressor and opens an outdoor damper to let cool fresh air in instead of cooling it while exhausting return warm air. This at 60*F and below outdoor ambient temperature.
If you read the diagram the outdoor temperature sensor is found there, phisicaly located typical straight down on lower part of the unit or one side.
In case of problem, short the two words together to achieve electrical continuity and to bypass the sensor.
Other type of systems may not apply to this method.
SOURCE: I have a 51GR Carrier window air conditioner and the
TRY:
Power off (Disconnect)
Push together "Temp up" and "On/off" and reconnect power while pushing.
SOURCE: carrier spit type air conditioner 5 blinks
Unit should reset with circuit breaker off/wait/on. Codes are near the end of this manual.
http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/48ss,sx-12si.pdf
My panel cannot be read.
SOURCE: ERROR CODE 5 FLASHES CARRIER SPLIT SYST. AIR COND. 42G250HP-1
5 flashing is ' compressor drive' and check the high pressure, condenser fan motor capacitor for proper running
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