Hobart Commercial Dishwasher Error Codes — What They Mean
Hobart commercial dishwashers (AM15, CLeN, UW50, and FOSS series undercounters, door-types, and flight machines) use electronic controls that display fault codes when problems are detected. Hobart is the dominant commercial dishwasher brand in US foodservice.
| Code | Meaning | Urgency |
|---|---|---|
| E1 | Wash tank temperature too low | Medium |
| E2 | Final rinse temperature too low | High |
| E3 | Low water level / fill fault | Medium |
| E4 | Drain fault | Medium |
| E5 | Wash pump motor fault | High |
| E6 | Rinse pump fault | High |
| E7 | Door switch fault | Medium |
| E8 | Detergent dispensing fault | Low |
Most Common Hobart Dishwasher Codes and Fixes {#fix}
E1 / E2 — Temperature Faults
The wash tank or final rinse isn’t reaching required temperature. Check: booster heater element continuity, thermostats, incoming hot water temperature (should be 140°F minimum for final rinse on low-temp units). High-temp units also need the tank heater.
E3 — Low Water Level / Fill Fault
Machine isn’t filling to the required level. Check: water supply pressure (at least 20 PSI), inlet valve strainer for scale, water valve solenoid coil resistance, float switch operation.
E4 — Drain Fault
Machine not draining completely. Check: drain pump operation, drain hose for kinks or blockage, check valve in drain line.
E5 — Wash Pump Motor
Wash pump motor failure or overload. Check pump motor for seized impeller, burned windings, or tripped overload. Wash pump is the primary cleaning mechanism — this is urgent.
E7 — Door Switch
Door not closed or door interlock switch fault. Verify door closes fully and latch engages. Check door switch continuity.
Parts Often Needed
| Part | Notes |
|---|---|
| Wash pump motor | Amazon | Most urgent repair — no washing without it |
| Booster heater element | Amazon | For E1/E2 temperature faults |
| Water inlet valve | Amazon | For E3 fill faults |
| Drain pump | Amazon | For E4 drain faults |
When to Call a Pro
Booster heater and high-voltage heating element work requires a qualified technician. Hobart authorized service handles circuit board and sealed system repairs.