Safety first: Disconnect power before working near water and electrical components.

Access pump: Remove the front panel and lower access cover to locate the Adler circulation pump in the reservoir area.
Check for obstructions: Remove the pump inlet screen and clean out any debris, scale, or slime that could block water flow.
Bleed air: Refill the reservoir to the proper level and tilt the unit slightly if needed to help purge trapped air from the pump housing.
Test pump voltage: With the unit in a test mode (refer to Adler service documentation), carefully measure voltage at the pump connector. If proper voltage is present but the pump does not run, the pump is defective.
Replace pump: Disconnect hoses and wiring, then install a new Adler circulation pump assembly, ensuring all clamps are tight and there are no leaks.
Run test cycle: Restore power and verify that water now flows evenly over the evaporator plate and E07 clears.

Display shows E07; water pump does not circulate water over the evaporator plate.

Possible Causes