What does Panasonic error code H99 mean?

H99 on Panasonic HVAC systems is a generic protection alarm indicating the system has shut down due to an abnormal operating condition. Check the outdoor unit PCB LED indicators for a more specific sub-code. H99 is often a secondary alarm — the primary cause is indicated by a different LED pattern on the outdoor unit main PCB.

How do I clear error codes on a Panasonic ECOi VRF system?

To clear fault history on Panasonic ECOi: navigate to the outdoor unit PCB and press the CHECK button 5 times within 3 seconds. For the Panasonic CZ-256ESMC3 centralized controller, go to System > Maintenance > Fault History and select Clear. Note that clearing faults does not resolve the underlying issue — always diagnose and fix the root cause first.

What does Panasonic error code F95 mean on ECOi VRF systems?

F95 on Panasonic ECOi indicates a heat exchange fin temperature sensor fault on the outdoor unit. The thermistor monitoring the outdoor heat exchanger coil temperature has failed open or short circuit. Measure resistance at room temperature — it should be approximately 10kΩ for Panasonic NTC10k sensors. Replace the sensor and inspect the connector for corrosion before restarting.

HVAC

Panasonic HVAC error codes, decoded.

Look up any Panasonic HVAC fault code below. Each one is grounded in Panasonic HVAC's own service documentation — the meaning, the symptoms, the causes, and the steps to clear it.

By Octavian Ghindea

Co-founder & CTO · Reviewed August 2026

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Panasonic HVAC sits in our HVAC coverage. Every page here is transcribed from the manufacturer's manuals, not scraped from forums.

What error codes does Panasonic HVAC display?

Tap a code for the full breakdown — meaning, symptoms, causes, and fix steps.

H99

Generic protection alarm — check outdoor unit PCB LED for sub-code

F11

Outdoor heat exchanger temperature sensor fault

E31

Communication fault between indoor and outdoor units

H19

Indoor unit fan motor fault

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