ACiQ EH60 Error Code

What does ACiQ EH60 mean?

EH60 indicates an indoor unit room temperature sensor (T1) error. This sensor measures the air temperature at the indoor unit. A temperature-sensor fault is flagged when the sensor's sampling voltage falls below or rises above the valid window, indicating an open or short circuit in the T1 sensor or its wiring.

Symptoms

• EH60 shown on the indoor unit display
• Poor temperature regulation or incorrect comfort behavior
• Unit may stop or run abnormally
• Fault isolated to the indoor room-air sensor circuit

Common causes

• Open or short circuit in the T1 sensor
• Loose or damaged sensor wiring or connector
• Out-of-range sensor resistance value
• Faulty indoor PCB sensor input

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Diagnostic steps

1. Inspect the sensor connection

   Check the wiring between the room temperature sensor and the indoor PCB and ensure it is properly connected.

2. Measure the sensor resistance

   Measure the T1 sensor's resistance and compare it against the manual's resistance table; replace it if out of range.

3. Reseat or repair wiring

   Correct any loose or damaged connection found at the sensor or board.

4. Replace the indoor PCB if needed

   If the sensor and wiring check out, the indoor board sensor input is the next likely cause.

When to call a professional

While checking a sensor connection is simple, confirming an out-of-range sensor with a meter and replacing the sensor or indoor control board requires opening the unit and working around live and capacitor-charged electronics. If EH60 persists after a basic connection check, contact a licensed HVAC technician. Sensor resistance testing and board replacement on these inverter systems are best handled by a qualified professional.