FieldBench
Daikin codes

Daikin

LPS

Lockout

Low pressure

Low-pressure / freeze protection. Charge, indoor airflow, metering.

Walk LPS in Diagnose

2 plates — walk the one on the cabinet

First check

1 Airflow and freeze before you add gas

On Daikin DX16TC 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

  • Do not add gas on a frozen indoor coil.
  • Indoor blower running the commanded CFM? Filter, coil.
  • Weigh-in on inverter. TXV health check only after the SKU is known.
  • 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 Daikin is not the same code on these plates.