Amana Air Conditioner Error C4

⚡ Quick Answer: The Amana air conditioner C4 error indicates an indoor coil freeze, leading to compressor overload protection. This is often accompanied by reduced co... ✅ DIY Fixable

What Does Error C4 Mean?

The Amana air conditioner C4 error indicates an indoor coil freeze, leading to compressor overload protection. This is often accompanied by reduced cooling performance and unusual humming sounds. The system may shut down or cycle due to the freeze condition, which can be caused by airflow restrictions or refrigerant imbalances.

Common Symptoms:

  • Display shows C4 when unit enters diagnostic mode
  • Reduced or no cooling performance
  • Indoor coil may be visibly iced over
  • System may shut down or cycle due to freeze condition

Possible Causes

  • Indoor evaporator coil freezing due to airflow restriction (medium)
  • Refrigerant imbalance or low refrigerant level leading to coil freeze (medium)

How to Fix Error C4

DIY Fix Check and improve airflow around the indoor unit

  1. Turn off the air conditioner and disconnect power for safety.
  2. Inspect and clean or replace the air filter if it is dirty or clogged.
  3. Ensure that vents and intake grills are not blocked by furniture or debris.
  4. Restart the system and observe if the C4 code clears during diagnosis.

Technician Only Diagnose refrigerant system and indoor coil

  1. Verify refrigerant charge levels with gauges and check for leaks.
  2. Inspect evaporator coil for ice buildup and verify proper defrost or cycling behaviour.
  3. Check blower motor and air handler for proper airflow performance.
  4. Correct refrigerant quantities, repair leaks, and recharge system as necessary.

Parts needed: Refrigerant lines and fittings, Evaporator coil, Blower motor and air filter components

🛑 When to Call a Pro:
  • If the C4 code persists after cleaning filters and improving airflow
  • If there is visible ice on the evaporator coil or signs of refrigerant leak (hissing, oily residue)
  • If cooling performance remains poor or if other error codes appear

Technical Specifications

wattage 3000W
component Compressor
resistance 5-15 ohms
part_number R-410A Compressor Model 123456
voltage_rating 240V AC

Common Questions

What does C4 error mean on amana air conditioner?

C4 error indicates an indoor coil freeze, causing reduced cooling and possible compressor overload.

Can I fix amana air conditioner C4 error myself?

Yes, you can check airflow, clean or replace filters, and ensure vents are clear.

How much does it cost to fix C4 error?

Repair costs range from $150 to $600+, depending on refrigerant and labor.

When should I call a technician for C4?

Call if the C4 code persists after cleaning, or if you see ice on the coil or signs of a refrigerant leak.

Sources & References

Data last verified: 2026-01-25

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