Solution for Pressure Readings Not Rising When Releasing Refrigerant During Leak ChecksUpdated a day ago

Introduction

This article provides a solution for pressure readings that do not rise when releasing refrigerant during leak checks.

Solution

Verify that the gauge tube pin on the manifold gauge is fully engaging the outdoor unit service port's Schrader valve. A pin that is over or underexposed will not allow the gauge to access the refrigerant circuit, preventing pressure measurement and/or proper vacuuming. The depressor pin inside the hose connector is adjustable for proper Schrader valve engagement. 

A telltale sign that this is happening is whether the gauge reading goes to instant vacuum when the pump is first turned on. This means only the gauge is being vacuumed. If so, vacuuming will need to be re-performed, since only the gauge itself was vacuumed.