What It Means
Malfunction of high pressure switch (HPS).
Daikin Packaged Unit
Daikin Packaged Unit Error Code H3
Troubleshooting guide for the Daikin Packaged Unit system fault H3.
Possible Causes
- Defective high pressure switch.
- Broken wire.
- Defective outdoor unit PCB.
- Defective connector contact.
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
Malfunction of high pressure switch (HPS)
All Recorded Causes
Defective high pressure switch Broken wire Defective outdoor unit PCB Defective connector contact
Verify Before Replacing Parts
- Confirm the exact Daikin model family and packaged context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since defective high pressure switch.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm broken wire.
- After the correction, run the system long enough to confirm the packaged fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Packaged Unit diagnostics step-by-step — so you confirm the cause before swapping parts.
