Check power and the temperature setting first, then listen at the bottom of the cabinet for the condenser fan and look for frost on the freezer's back panel.

An electric oven that lights up, beeps, and counts down a preheat but never gets hot has lost its heat somewhere between the control board and the bake element.

A dishwasher holds water two ways while it runs: pooled in the sump at the bottom of the tub between cycles, and moving at pressure through the spray arms, the circulation pump, the drain pump, the inlet valve, and a web of hoses and fittings underneath the unit.