Amana
LPS
LockoutLow pressure / freeze
Suction dropped out — charge, indoor airflow, or TXV.
Walk LPS in Diagnose
2 plates — walk the one on the cabinet
First check
1 Airflow and freeze before you add gas
On Amana ALXT7C low pressure / freeze is indoor airflow or a starved coil until proven otherwise. Filter, blower, dirty A-coil, closed supplies. In heat mode, a iced outdoor coil is the same family. Indoor filter, blower, coil freeze. Do not add gas on a frozen coil.
Expect: Indoor air moving. Coil not iced. OD coil clear in heat.
The rest of the walkthrough is Diagnose.
On the plates
- Indoor filter, blower, coil freeze. Do not add gas on a frozen coil.
- TXV / restriction. Weigh-out if the history is a leak.
- Low ambient and wind can nuisance-trip LPS on a light load — still prove charge.
Plates that use LPS
Same number, other makers
LPS on Amana is not the same code on these plates.