What It Means
PA indicates a broken or open heater element circuit within the humidifier unit accessory occasionally paired with Daikin split systems, detected as a wiring or continuity failure rather than a temperature-related fault.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code PA
Troubleshooting guide for the Daikin Split & Multi-Split system fault PA.
Possible Causes
- Heater element wire broken or burned open.
- Heater unit failed internally (element burnout).
- Loose or corroded connector between the heater and outdoor/indoor PCB.
- Damaged heater harness from moisture intrusion or vibration chafe.
- Thermistor monitoring the heater circuit reading out of range and triggering a false trip.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
PA indicates a broken or open heater element circuit within the humidifier unit accessory occasionally paired with Daikin split systems, detected as a wiring or continuity failure rather than a temperature-related fault. This shuts down humidifier operation and, depending on the model's control logic, can also halt the associated indoor unit until the fault is cleared. PA differs from P9 (which is a humidifier fan motor failure) and PH (which relates to the refrigerant charging cylinder heater during factory/service charging) — PA is specifically the broken-wire condition on the humidifier's own heating element.
All Recorded Causes
Heater element wire broken or burned open. Heater unit failed internally (element burnout). Loose or corroded connector between the heater and outdoor/indoor PCB. Damaged heater harness from moisture intrusion or vibration chafe. Thermistor monitoring the heater circuit reading out of range and triggering a false trip.
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since heater element wire broken or burned open.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm heater unit failed internally (element burnout).
- After the correction, run the system long enough to confirm the split/ multi split fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Split & Multi-Split diagnostics step-by-step — so you confirm the cause before swapping parts.
