What E6 (Class Series) Means
E6 on the Class-series board is the shorted-circuit counterpart to E2: the second thermistor channel is reading a short. Because that channel supervises condenser-side conditions on U-Line's service-menu labeling rather than cabinet air, a short here skews what the board believes about heat rejection instead of about your food.
Common Causes of E6 (Class Series)
- Condenser-area sensor shorted internally
- Harness rubbed through against a chassis edge in the machine compartment
- Connector contaminated in the warm, dusty air the condenser fan pulls through
🔧 One Safe Check You Can Try
Before any of that, one thing is worth ruling out. Pull the grille and look at the condenser. A coil packed with dust from an enclosed undercounter space produces genuinely high readings, and it is the cheaper explanation to eliminate first.
⚠ Why You Shouldn't Go Further Than That
- Machine-compartment wiring on a U-Line undercounter unit runs close to refrigerant tubing and the compressor terminal box, so probing blind in there carries real consequences.
- A shorted condenser sensor and a genuinely overheating condenser look the same to the control, and sorting that out takes a meter on both the sensor and the coil temperature.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.