Code decoder
Polar King error codes
Pick the maker and the equipment, or type the code. Each page says what the code means on that control, what is safe to check and when to stop.
- Codes
- 2,442
- Makers with codes
- 98
- Updated
- November 2026
COMMUNICATION ERRORPolar King Walk-In Alarm COMMUNICATION ERROR: No Controller LinkDEFR TERM ON TIMEPolar King Walk-In Cooler Alarm DEFR TERM ON TIME: Timed Defrost EndDOOR SWITCHPolar King Walk-In Cooler Alarm DOOR SWITCH: Door Open and Room WarmEXCESS DEFROSTPolar King Walk-In Cooler Alarm EXCESS DEFROST: Three Quick DefrostsHIGH AIR TEMPPolar King Walk-In Cooler Alarm HIGH AIR TEMP: Room Too WarmHIGH SUPERHEATPolar King Walk-In Cooler Alarm HIGH SUPERHEAT: Above Upper LimitLOW AIR TEMPPolar King Walk-In Cooler Alarm LOW AIR TEMP: Room Too ColdLOW SUPERHEATPolar King Walk-In Cooler Alarm LOW SUPERHEAT: Below Lower LimitPRESSURE SENSORPolar King Walk-In Cooler Alarm PRESSURE SENSOR: Out of RangeT1 SUCTION SENSORPolar King Walk-In Cooler Alarm T1 SUCTION SENSOR: Shorted or OpenT2 AIR SENSORPolar King Walk-In Cooler Alarm T2 AIR SENSOR: Shorted or OpenT3 COIL SENSORPolar King Walk-In Cooler Alarm T3 COIL SENSOR: Shorted or OpenT4 AUX SENSORPolar King Walk-In Cooler Alarm T4 AUX SENSOR: Shorted or OpenEmail failurePolar King Walk-In Cooler Error Code email failure: Alert Not SentEXT ALARMPolar King Walk-In Cooler Error Code EXT ALARM: Input ActiveFTP communication alarmPolar King Walk-In Cooler Error Code FTP Alarm: No Server LinkSNTP Communication alarmPolar King Walk-In Cooler Error Code SNTP Alarm: No Time Server Link
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Code not listed, or no code at all?
A unit that shows nothing often points to power or the control. Call us with the maker and model number and we talk it through.