FieldBench
Goodman codes

Goodman

HPS / LPS

Lockout

Pressure

Airflow or charge.

Walk HPS / LPS in Diagnose

2 plates — walk the one on the cabinet

First check

1 Heat rejection first

On Goodman GSZ14 high pressure is outdoor airflow until proven otherwise. Fan running the right direction, coil clean, fins not folded, no recirc over a fence or through a garage. Coil, fan, indoor airflow in heat (often the missed one).

Expect: OD fan on, coil clean, discharge air leaving the top/side freely.

The rest of the walkthrough is Diagnose.

On the plates

  • Coil, fan, indoor airflow in heat (often the missed one).
  • Charge by SH/SC for this piston/TXV pair — not a GSZC18 weigh-in.
  • Coil, fan, charge by weigh-in — you do not ‘top off’ a Greenspeed.
  • Outdoor fan that is actually the inverter-driven fan, not a dual-cap PSC motor.
  • Do not use 24ACC6 piston superheat as the pass/fail.

Plates that use HPS / LPS

Same number, other makers

HPS / LPS on Goodman is not the same code on these plates.