Thermistor
Common temperature-sensing fault part. Confirm resistance range and connector.
Scotsman Ice Machine Error Code 6 — What It Means
Scotsman error code 6 indicates a long harvest condition occurred multiple times — the machine completed the freeze cycle but the harvest cycle (where ice is released from the evaporator) took longer than the maximum allowed duration more than once within a defined period. On Scotsman cube ice machines, the harvest cycle uses hot gas or water to release ice from the evaporator grid; if it takes too long (typically more than 3–4 minutes), the controller logs a long harvest event. Multiple occurrences trigger code 6 and place the machine in a safety shutdown.
Common Causes
- Scale or mineral buildup on the evaporator — Mineral deposits on the ice-forming evaporator slow heat transfer during harvest, extending the time for ice release.
- Insufficient hot gas during harvest — Low refrigerant charge or a hot gas bypass valve issue reduces the heat available to release ice from the evaporator.
- Water temperature too warm — On water-harvest machines, warm incoming water slows harvest; on hot gas harvest machines, high ambient temperatures reduce the temperature differential driving harvest.
- Dirty or restricted harvest water system — Plugged water distributors or scale on the evaporator curtain slow water flow and extend harvest.
Step-by-Step Fix
- Clean the ice machine thoroughly — Remove all ice from the bin. Run a full clean and sanitize cycle per the Scotsman procedure using Scotsman Scale Remover. This dissolves mineral deposits on the evaporator, water system, and curtain.
- Clean the condenser — On air-cooled units, clean the condenser coil and fan. A dirty condenser raises head pressure and reduces hot gas temperature during harvest.
- Inspect the water system — Remove and clean the water curtain, float valve, and water distributor holes. Blocked distributor holes cause uneven water flow during harvest.
- Check incoming water temperature — Measure water temperature at the inlet. Water above 70°F (21°C) will slow harvest; consider a water filter or supply line change to reduce temperature.
- Check for refrigerant issues — If cleaning doesn’t resolve code 6, the refrigerant charge or hot gas valve may need service. This requires an EPA 608-certified technician.
- Reset the machine — After cleaning, power cycle the machine and monitor the first several freeze/harvest cycles. Each harvest should complete in under 2–3 minutes.
Parts Often Needed
| Part | Notes |
|---|---|
| Scotsman scale remover | Use Scotsman-approved descaler — phosphoric acid based; follow dilution instructions |
| Water inlet valve | If water supply is slow or flow is restricted |
| Hot gas valve | If harvest consistently takes too long after cleaning |
Need Replacement Parts?
Before ordering, match the ice-machine part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Pro
If code 6 returns after thorough cleaning, a certified refrigeration technician should check refrigerant charge, hot gas valve operation, and evaporator surface condition. Repeated harvest problems with clean equipment indicate a refrigerant system issue requiring EPA 608 handling.