What does ACiQ EL01 mean?

EL01 means the indoor unit can no longer communicate with the outdoor unit. The ACiQ control boards exchange a signal over the communication line, and when that signal is lost or stuck, the system flags EL01 and stops.

What does ACiQ EL0C mean?

EL0C indicates the ACiQ system has detected that it lacks refrigerant. The control logic monitors system behavior and flags EL0C when the refrigerant charge appears insufficient for normal operation, which protects the compressor from running under a damaging low-charge condition until the issue is corrected.

What does ACiQ EH00 mean?

EH00 indicates an indoor unit EEPROM malfunction, meaning the indoor PCB's main chip is not receiving valid feedback from its EEPROM memory chip. The EEPROM stores the board's operating parameters; when the controller cannot read them correctly, the indoor unit flags EH00.

Does AskWhiz cover ACiQ equipment?

Yes. AskWhiz is trained on official ACiQ service and operator documentation, so it can answer fault-code, error-message, and repair questions for ACiQ HVAC equipment directly in WhatsApp.

How do I troubleshoot ACiQ error codes?

Send AskWhiz your ACiQ model number and the error code or symptom on WhatsApp. It searches the official ACiQ manuals and returns the likely cause and the documented fix, step by step, so you stop scrolling through PDFs in the field.

Is AskWhiz a substitute for the ACiQ service manual?

No. AskWhiz reads the official ACiQ documentation and surfaces the relevant procedure fast, but always follow the manufacturer safety warnings and call a qualified ACiQ technician for work that requires one.

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By Octavian Ghindea

Co-founder & CTO · Reviewed June 2026

What error codes does ACiQ display?

EL01

Indoor and outdoor unit communication error

EL0C

System lacks refrigerant

EH00

Indoor unit EEPROM malfunction / parameter error

EH02

Zero-crossing signal detection error

EH03

Indoor unit fan speed out of control

EH60

Indoor unit room temperature sensor (T1) error

EH61

Indoor unit pipe temperature sensor (T2) error

EC51

Outdoor unit EEPROM parameter error

EC52

Outdoor unit coil temperature sensor (T3) error

EC53

Outdoor unit ambient temperature sensor (T4) error

EC54

Compressor discharge temperature sensor (TP) error

EC07

Outdoor unit fan speed out of control

Common questions about ACiQ equipment

What other HVAC brands does AskWhiz cover?

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Aermec Airquest Amana Belimo Bell & Gossett Bosch HVAC Braeburn Systems Bryant Carrier CIAT Climaveneta Comfortmaker

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