What It Means
Reports a general fault or alarm relayed from the thermal (ice/brine) storage unit's own controller to the chiller — typically a communication or upstream safety fault from the storage unit rather than a chiller-side sensor failure.
Daikin Chiller
Daikin Chiller Error Code 97
Troubleshooting guide for the Daikin Chiller system fault 97.
ACLogics Standardize Chiller diagnostics See the commercial workflow → Standardize Chiller diagnostics
Possible Causes
- Fault or alarm signal received from the thermal storage unit's own controller.
- Loose or damaged communication wiring between the chiller and the storage unit controller.
- Loss of control power to the storage unit.
- Defective storage unit PCB.
- Incorrect storage unit address or configuration setting.
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.
New to this code? Click to see why this happens
Full Diagnosis
Reports a general fault or alarm relayed from the thermal (ice/brine) storage unit's own controller to the chiller — typically a communication or upstream safety fault from the storage unit rather than a chiller-side sensor failure. It is a broader storage-unit-level alarm than the neighboring 98 code, which isolates the fault specifically to a brine circulation pump overcurrent trip, or 99, which isolates it specifically to a low brine tank level. Depending on the installed configuration, the chiller may continue cooling directly while ice-storage charge/discharge cycling is disabled until the fault clears.
All Recorded Causes
Fault or alarm signal received from the thermal storage unit's own controller. Loose or damaged communication wiring between the chiller and the storage unit controller. Loss of control power to the storage unit. Defective storage unit PCB. Incorrect storage unit address or configuration setting. A storage-unit safety device (float switch, pressure switch) tripped upstream of the chiller.
Verify Before Replacing Parts
- Confirm the exact Daikin model family and chiller context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Daikin fault points at fault or alarm signal received from the thermal storage unit's own controller.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out loose or damaged communication wiring between the chiller and the storage unit controller.
- After the correction, run the system long enough to confirm the chiller fault does not return under normal load.
Diagnosing Chiller across a fleet?
ACLogics standardizes commercial Chiller diagnostics across your whole team — consistent steps, less guesswork on every call.