Getting new appliances can be quite costly, so it is worth it to make sure your appliances last as long as possible. Here are a few points to keep in mind to keep them running well.
One of the major dangers to your appliances is poor ventilation. Without proper ventilation your appliances could overheat, or they could function at less than optimal efficiency. This will shorten their lifespan.
Make sure you leave space around them, and check that there is not dust or particles building up blocking vents or other areas where air needs to flow.
You should also keep your appliances on a level surface. Many times you can compensate for uneven surfaces with adjustable legs on the appliance, but if this is not an option, try to either move it to a different location or adding stable supports that will level it.
You should also inspect the wires and connectors on your appliance. Check for loose connections, corroded wires, and make sure the insulation around the wires is without cracks. If there is a problem with any of these items, it is best to have it fixed as soon as possible by a professional, since it could pose a fire hazard.