Equipment error code

Goodman code E8

E8 — low pressure fault. Suction pressure dropped below the control’s low-pressure protection point.

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

What this code means

E8 — low pressure fault. Suction pressure dropped below the control’s low-pressure protection point.

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

Which models show it

Goodman GSZH, GSXC heat pumps and GSX cooling units with integrated fault storage.

What is actually happening

Unit may run briefly then lock on E8; cooling or heating output stops.

Is it safe to keep running?

One reset maximum. Chronic low pressure damages compressor bearings.

Shut it down when

Ice on lines in summer, audible leak, or breaker trips.

What a homeowner can safely check

New indoor filter.
Open supply vents.
Outdoor coil clear of mulch and debris.
Note recent temperature swings — helps tech separate charge vs airflow issues.

When to stop

Oil or hiss at fittings.
E8 in heat mode with outdoor unit iced — do not chip ice.

Likely causes ranked

1. Refrigerant leak
How a tech confirms: Electronic leak detection; repair and weigh-in.
Typical repair: $275–$1,100 · Air Conditioner Repair cost guide
2. Indoor airflow restriction
How a tech confirms: Static pressure test; blower and coil inspection.
Typical repair: $150–$425 · Air Conditioner Repair cost guide
3. TXV or metering restriction
How a tech confirms: Superheat analysis; replaces valve or drier.
Typical repair: $350–$900 · Air Conditioner Repair cost guide
4. Defective low-pressure switch
How a tech confirms: Gauge versus switch state test.
Typical repair: $210–$460 · Air Conditioner Repair cost guide

Is this the end of this unit?

Coil replacement plus recharge on aging Goodman heat pumps often exceeds half the cost of a new matched system.

How to clear the code

Five-minute off, filter serviced, single power cycle at outdoor disconnect.

Why clearing is not fixing it: Low charge or restriction recreates E8 on the next run.

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 E8 meaning?

Low pressure fault — suction side below cutoff.

E8 in heating mode?

Common with low charge or outdoor airflow issues during defrost — professional gauges required.

Can dirty filter trigger E8?

Yes — frozen evaporator from low airflow can pull suction pressure down.

Typical E8 cost?

$150–$1,100 depending on leak severity and parts.

E8 and E4 together?

Freeze stats (E4) often precede low-pressure trips — report both codes to your tech.

Source

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