Panasonic AC Error Code HC — What It Means & How to Fix It

What Does This Error Mean?

HC on a Panasonic inverter AC means the outdoor unit has detected an overcurrent condition in the compressor drive circuit. Panasonic's inverter controller monitors compressor current continuously and shuts down when current exceeds the rated limit. This protects the compressor motor windings and the inverter transistors from heat damage.

Affected Models

Panasonic CS-SU Series
Panasonic CS-PU Series
Panasonic CS-EU Series
Panasonic CS-YU Series
Panasonic Inverter Split AC (all models)
Panasonic 1 Ton / 1.5 Ton / 2 Ton Inverter

Common Causes

Compressor winding insulation breaking down — increased current draw as winding resistance drops
Inverter PCB transistor (IGBT) damaged or failing — causing improper switching and current spikes
Refrigerant overcharge creating excessive discharge pressure and compressor load
Mains supply voltage consistently below safe operating range (below 180V AC)
Outdoor heat exchanger fouled with dust or cottonwood — compressor running at higher load than designed
Compressor crankcase heater failed — compressor starting with liquid refrigerant in the crankcase, causing current spike

How to Fix It

Switch off the AC at the remote and at the main circuit breaker.

Allow the system to fully shut down. Waiting 30 minutes also allows the compressor to cool and any thermal protection to reset.
Check the outdoor unit coil fins for dust and debris.

Panasonic recommends cleaning the outdoor unit fins at least once per season. Cottonwood (tree fluff) and fine dust create an insulating layer on the fins that dramatically reduces heat rejection and increases compressor load.
Check the mains supply voltage.

Panasonic inverter ACs are rated for 198V-242V in India. A consistent supply below 198V causes the inverter to draw higher current, eventually triggering HC. Check with a voltmeter or contact your electricity board.
Call a Panasonic technician if HC returns after one restart attempt.

The technician will check refrigerant pressures, measure compressor current, and test the inverter module. Do not allow repeated restart attempts — each attempt risks further PCB damage.

When to Call a Professional

HC on a Panasonic AC requires a Panasonic-authorised technician. Panasonic customer care India: 1800-103-1333. Panasonic has Authorized Service Centres (ASCs) in most Indian cities. The technician will use a clamp meter to measure running current and compare against the nameplate rated current.

Frequently Asked Questions

What is the rated running current of a Panasonic 1.5 ton inverter AC?

The rated running current of a 1.5 ton Panasonic inverter AC at full load is typically 7-9 amps at 220V. At low speed (minimum compressor frequency), current drops to 2-3 amps. HC triggers when current exceeds approximately 15-18 amps, which is well above the normal operating range.

Can HC appear on a new Panasonic AC during the first summer?

It is rare but possible. New installations with incorrect refrigerant charge (overcharge during installation) can cause HC from the first hot day. Always ask the installer to verify refrigerant charge with manifold gauges after installation. An overcharged new unit should be corrected free of charge by the installer.