Goodman AC Frozen Evaporator Coil: Causes, Fixes & Costs

Last updated Oct 25, 2026 · By fixme.vip Editorial

Goodman air conditioner frozen evaporator coil: what it means

“Frozen evaporator coil” is not a fault code on most Goodman air conditioners. It is a condition you can see: frost or ice forms on the indoor coil or on the copper suction line at the outdoor unit.

The coil freezes when its surface drops below 32°F. That happens for one of two reasons:

• Not enough warm air crosses the coil. This is an airflow problem.
• The refrigerant inside runs too cold. This is usually low charge from a leak or a refrigerant restriction.

Typical signs include:

• Weak or warm airflow from the vents
• An AC that runs constantly
• Water around the air handler or furnace as ice melts

Reset behavior:

• Standard Goodman condensers have no freeze-protection lockout, so they keep running and the ice keeps growing.
• Some models with a low-pressure switch, and communicating or inverter systems, may stop the compressor and log a fault. Whether it auto-resets depends on the model.

Severity is pro. You can thaw the coil and fix airflow basics yourself, but repeat freezing almost always needs a technician.

Goodman air conditioner frozen evaporator coil: common causes, ranked by probability

1. Dirty or clogged air filter. This is the most common cause of restricted airflow and coil icing.
2. Closed or blocked supply registers and return grilles. Furniture, rugs or many closed vents reduce airflow across the coil.
3. Dirty evaporator coil. Dust and biological growth on the coil fins block airflow even when the filter is clean.
4. Low refrigerant charge from a leak. Low charge drops coil pressure and temperature below freezing. Goodman evaporator coils and line sets can develop leaks, and these require a licensed tech.
5. Blower problems. A failing blower motor, a weak blower capacitor, a dirty blower wheel, or an incorrect fan-speed setting for cooling all cut airflow.
6. Refrigerant metering restriction. A sticking TXV or a clogged piston or filter-drier starves the coil.
7. Running in cool weather or with the thermostat set very low. Operating below about 60°F outdoors, or long run times with low indoor heat load, can ice a coil. This is especially true when another issue is already present.
8. Restricted or undersized ductwork. Collapsed flex duct or a return that is too small can cause chronic low airflow.

How to fix Goodman air conditioner frozen evaporator coil: safe checks first

1. Thaw the coil first.
   • Set the thermostat to OFF for cooling and the fan to ON.
   • Let it run until the ice is fully gone and the suction line at the outdoor unit is dry.
   • Never chip or scrape the ice.
2. Check the air filter. Replace it if it is gray, clogged or more than about 1 to 3 months old. Make sure the size matches and the airflow arrow points toward the blower.
3. Open the registers and clear the returns. Make sure most supply vents are open and nothing blocks the return grilles.
4. Check the thermostat.
   • Confirm it is set to COOL at a reasonable setpoint, around 72–78°F, not the lowest setting.
   • Replace the batteries if the display is dim or blank.
5. Watch the condensate drain. As the ice melts, make sure the drain line and pan can handle the water.
   • Clear the drain line opening or vent tee if it is visibly clogged.
   • If your system has a float or safety switch that shut the unit off, the water level will need to drop before it restarts.
6. Check the breaker and switches. Reset a tripped AC or air handler breaker once. If it trips again, leave it off and call a technician.
7. Seat the panels. Make sure the air handler or furnace access panels are firmly in place, since missing panels disrupt airflow.
8. Restart and observe. After a full thaw, turn cooling back on and check the vents in 15–30 minutes. If you see frost on the suction line or the coil again within a day, turn cooling off and call a technician.

How a technician will diagnose it

• Thaw first. Pressures and temperatures can’t be read correctly on an iced coil, so a good tech thaws it or asks you to.
• Measure airflow. The tech checks total external static pressure and the temperature drop across the coil, typically about 16–22°F. They also confirm the blower speed tap or ECM setting matches the cooling tonnage.
• Inspect the blower. This includes checking motor amps, testing the run capacitor (on PSC motors), and checking the blower wheel for dirt buildup.
• Inspect the coil. The tech looks for a dirty face, matted fins and oil spots that could indicate a leak.
• Check the refrigerant charge. They attach gauges and measure superheat (for piston systems) or subcooling (for TXV systems), following Goodman’s charging chart on the unit.
• Find the leak if the charge is low. Methods include an electronic detector, bubbles, UV dye or a nitrogen pressure test. A proper repair fixes the leak. It should not just add refrigerant.
• Test for restrictions. Temperature drop across the filter-drier and TXV bulb mounting and operation are checked.

Red flag: a quote to simply “top off” refrigerant every season without a leak search.

Symptom, cause and what to do

Goodman air conditioner frozen evaporator coil repair cost

These are typical US ranges for parts and labor. They vary by region and by whether parts are under warranty.

• Air filter (DIY): $5–$40
• Service call and diagnosis: $75–$200
• Evaporator coil cleaning: $100–$400
• Blower run capacitor: $120–$300
• Blower motor (PSC): $350–$700
• Blower motor (ECM or variable speed): $600–$1,500
• Blower speed adjustment: $75–$200, often included in the diagnosis fee
• Leak search: $200–$500
• Leak repair (braze or line set section): $200–$1,000+
• Refrigerant recharge (R-410A or R-454B): $200–$800+, depending on pounds and current pricing
• TXV replacement: $400–$1,200, including recover, evacuate and recharge
• Filter-drier replacement: $200–$500
• Evaporator coil replacement: $1,200–$2,800. Goodman’s parts warranty often covers the coil if the unit is registered, but labor and refrigerant are still billed.
• Duct repair or return upgrade: $300–$2,500+

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