HVAC Refrigeration Guide — Heatcraft

Heatcraft Bohn Larkin Unit Cooler Troubleshooting

Jul 19, 2026

HVACR techs: learn how to read Heatcraft IntelliGen alarm codes (AL01, AL06, ER25, ER26) before swapping parts. This guide covers the most common unit cooler faults — high box temp, door open alarms, connection-lost errors, and evaporator fan failure — with confirmed OEM part numbers for the two failures we see most: contactor failure (2259996) and evaporator fan motor failure (25322406).

Tags: 2259996, 25308301S, 25312601S, 25322406, AL01, AL06, alarm codes, Bohn, Chandler, contactor, ER25, ER26, evaporator fan, Heatcraft, high box temp, HVACR, IntelliGen, Larkin, not cooling, R026215300, refrigeration, troubleshooting, unit cooler, walk-in cooler

Condenser Fan Motor Diagnosis

May 13, 2026

A field-tested diagnostic guide for condenser fan motor failures — covering winding failure, bearing seizure, capacitor misdiagnosis, and OEM spec matching. Includes a symptom-to-cause table, step-by-step diagnostic sequence, and brand-specific notes for Trane, Heatcraft, York, and Nordyne.

Tags: bearing failure, commercial HVAC, condenser fan motor, Heatcraft, HVAC, motor diagnosis, Nordyne, OEM replacement, refrigeration, run capacitor, Trane, winding failure, York