Jackson dishwasher does not heat water; cycles run but final rinse or wash temperature never reaches setpoint and machine displays E3.

Safety first: Disconnect power at the breaker. Jackson dishwashers often use high-amperage heating circuits—only work on them if you are qualified.

• Verify incoming hot water: Check that the building’s hot water supply to the dishwasher meets Jackson’s minimum temperature specification (often 120–140°F for fill, depending on model). Low supply temperature can trigger heat errors.
• Inspect tank heating element: Access the wash tank or booster heater compartment. Visually inspect the stainless steel immersion heater for burn marks, cracks, or leaks. Test resistance with a multimeter; an open circuit indicates a failed element.
• Check temperature probe: Locate the tank or booster temperature sensor (thermistor or thermostat bulb). Ensure it is fully immersed and not coated with heavy scale. Clean gently and test resistance against Jackson’s service chart if available. Replace if readings are out of range.
• Test heater contactor/relay: With power off, inspect the heater contactor for welded contacts or burned terminals. With power on (qualified personnel only), verify that the contactor energizes when heat is called for. Replace the contactor or solid-state relay if it does not close or is stuck closed.
• Inspect wiring and high-limit thermostat: Check for tripped manual-reset high-limit thermostats on the tank or booster. Reset if tripped and investigate cause (e.g., low water level, scale). Inspect wiring for heat damage.

If all components test good, the control board or temperature control module may be defective and should be evaluated by a Jackson-authorized technician.