FieldBench
Amana codes

Amana

HPS

Lockout

High pressure

Outdoor airflow, overcharge, or restriction opened the high-pressure switch.

Walk HPS in Diagnose

4 plates — walk the one on the cabinet

First check

1 Heat rejection first

On Amana ALXS4B 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. Fan running? Coil dirty? SC vs nameplate on a TXV coil.

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

The rest of the walkthrough is Diagnose.

On the plates

  • Outdoor fan running? Coil dirty, recirc, bent fins.
  • Subcooling vs indoor TXV sheet. Liquid-line drier / restriction.
  • Do not keep resetting HPS into a locked fan.
  • Fan running? Coil dirty? SC vs nameplate on a TXV coil.

Plates that use HPS

Same number, other makers

HPS on Amana is not the same code on these plates.