Equipment error code

Goodman code E4

E4 — freeze stat fault. The evaporator freeze thermostat opened or the control detected a coil freeze condition.

Equipment: heat pump
Brand: Goodman
Source checked: 2026-03-01

What this code means

E4 — freeze stat fault. The evaporator freeze thermostat opened or the control detected a coil freeze condition.

Source: Goodman SS-GSX14 Service Instructions — Self-Check Fault Codes · checked 2026-03-01

Which models show it

Goodman heat pumps GSZH, GSXC with indoor freeze thermistor and outdoor diagnostics.

What is actually happening

System stops heating or cooling; coil may be iced indoors or outdoors depending on mode.

Is it safe to keep running?

Do not run heat pump in cool mode with a frozen coil. Allow melt before one retry.

Shut it down when

Ice on refrigerant lines thick enough to block airflow, or water leaking from coil pan.

What a homeowner can safely check

Replace dirty filter — primary homeowner fix for freeze trips.
Ensure all registers open; avoid closing too many zones.
In heat mode, check outdoor unit not buried in snow.
Turn system off and fan on at thermostat to melt ice before service if comfortable doing so.

When to stop

Ice returns within one day after filter change.
Water damage at ceiling or coil cabinet.
E4 with suspected low charge (hissing, poor performance).

Likely causes ranked

1. Low indoor airflow
How a tech confirms: Static pressure; blower speed adjustment.
Typical repair: $150–$400 · Air Conditioner Repair cost guide
2. Low refrigerant charge
How a tech confirms: Leak search and weigh-in.
Typical repair: $275–$1,050 · Air Conditioner Repair cost guide
3. Failed freeze stat or sensor
How a tech confirms: Ohms sensor; replaces stat if open out of range.
Typical repair: $175–$385 · Air Conditioner Repair cost guide
4. Stuck reversing valve or defrost board issue
How a tech confirms: Defrost cycle observation; valve shift test.
Typical repair: $350–$950 · Air Conditioner Repair cost guide

Is this the end of this unit?

Chronic freeze faults on older heat pumps with coil leaks point to system replacement.

How to clear the code

Melt ice with fan-only mode, new filter, then single cool or heat call after coil is dry.

Why clearing is not fixing it: E4 returns while airflow or charge problems persist.

Which trade to call

Call a licensed hvac contractor who works on heat pump equipment. Gas, refrigerant, and combustion faults are not general handyman jobs.

More codes from this brand

Symptom guide: AC Blowing Warm Air

FAQ

Goodman E4 meaning?

Freeze stat fault — coil freeze protection tripped.

E4 in winter heat?

Outdoor coil can ice in heat mode if defrost fails — needs tech diagnosis.

How long to melt ice?

Fan-only at thermostat for 1–3 hours often clears light ice after filter fix.

E4 repair costs?

$150–$950 from airflow fixes to valve or defrost repairs.

Prevent E4?

Monthly filter checks during peak season and keeping registers open.

Source

Source — Goodman SS-GSX14 Service Instructions — Self-Check Fault Codes. Checked 2026-03-01.