SymbolIndex

Heating & air conditioning symbols chart

34 symbols and what they mean · symbolindex.com

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  1. AUTO mode symbolAUTO modeAUTO operation mode
  2. Airflow rate: Auto symbolAirflow rate: AutoAutomatic airflow rate
  3. Anti-freeze symbolAnti-freezeAnti-freeze function
  4. Burner anti-cycling symbolBurner anti-cyclingBurner anti-cycling time
  5. Burner on symbolBurner onBurner operating
  6. COMFORT AIRFLOW symbolCOMFORT AIRFLOWCOMFORT AIRFLOW operation
  7. COOL mode symbolCOOL modeCOOL operation mode
  8. Comfort dehumidifying symbolComfort dehumidifyingButton and indicator for comfort dehumidifying.
  9. Continuous symbolContinuousContinuous dehumidifying
  10. DRY mode symbolDRY modeDRY (dehumidifying) operation mode
  11. Domestic hot water symbolDomestic hot waterDomestic hot water active
  12. ECO symbolECOECO function
  13. ECONO symbolECONOECONO operation
  14. FAN mode symbolFAN modeFAN (fan only) operation mode
  15. Fault symbolFaultBoiler fault
  16. Filter (clean filter reminder) symbolFilter (clean filter reminder)The filter light comes on after 250 hours of running as a reminder to clean the air…
  17. HEAT mode symbolHEAT modeHEAT operation mode
  18. Heating indicator symbolHeating indicatorWorking (heating) indicator
  19. Heating mode symbolHeating modeHeating mode active
  20. Heating system filling pressure symbolHeating system filling pressureHeating filling pressure
  21. INTELLIGENT EYE symbolINTELLIGENT EYEINTELLIGENT EYE (presence sensor)
  22. Indoor unit quiet symbolIndoor unit quietIndoor unit quiet airflow
  23. Key lock symbolKey lockKeypad lock
  24. Maintenance required symbolMaintenance requiredThe boiler needs maintenance work but is not in fault and keeps running normally.
  25. OUTDOOR UNIT QUIET symbolOUTDOOR UNIT QUIETOUTDOOR UNIT QUIET operation
  26. POWERFUL symbolPOWERFULPOWERFUL operation
  27. Power level (MIN / MED / MAX) symbolPower level (MIN / MED / MAX)Heating power level
  28. Pump symbolPumpPump drain (pump models only)
  29. Right and left swing symbolRight and left swingRight and left auto swing
  30. Standby (plug) symbolStandby (plug)Radiator in standby
  31. Summer mode symbolSummer modeSummer mode (heating off)
  32. Timer on/off symbolTimer on/offTimer on / timer off
  33. Turbo symbolTurboTurbo fan speed
  34. Up and down swing symbolUp and down swingUp and down auto swing
Symbol Index · symbolindex.com/categories/climate-control/chart · free to use, credit appreciatedPrinted 2026-11-12