• Basement and foundation - Check for cracks and moisture, and repair if necessary.
• Toilet - Check for leaks in water feed, tank bottom, and repair if necessary.
• Interior caulking and grout - Inspect caulking and grout around tubs, showers, and sinks; replace if deteriorating.
• Water heater - Drain water until clear of sediment; inspect flue assembly (gas heater); check for leaks and corrosion.
• Clothes washer - Clean water inlet filters; check hoses and replace if leaking.
• Clothes dryer - Vacuum lint from ducts and surrounding areas.
• Refrigerator - Clean drain hole and pan (more often in warm weather); wash door gasket; vacuum condenser coils.
• Wiring - Check for frayed cords and wires; check exposed wiring in basements, and repair if necessary.
• Exhaust fans - Clean grill and fan blades.
• Range hood fan - Wash fan blades and housing.
• Sink - Check all faucets, hose bibs, and supply valves for leakage.
• Bathroom - Check for evidence of leaks around and under sinks, showers, toilets, and tubs.
• Breaker box - Trip circuit breakers and ground fault interrupters monthly to insure proper protection.

-- Tips courtesy of HomeAdvisor.com