Power Outage Appliance Protection:
Before, During & After

The biggest risk to appliances during a power outage isn't the outage itself — it's the voltage surge when power is restored. Unplug sensitive appliances during extended outages, keep refrigerator doors closed, and install a whole-home surge protector for long-term protection.

Before an Outage: Preventive Protection

• Install a whole-home surge protector. A whole-home surge protector installs at the electrical panel and clamps voltage spikes before they reach any outlet in the house. Cost: $200–$400 installed by an electrician. This is the most effective single protection measure for all appliances.
• Use surge-protected power strips for major appliances. For appliances not on whole-home protection, a quality surge protector strip ($25–$60) at the outlet provides a second line of defense. Look for strips rated at 1,000+ joules.
• Keep your freezer reasonably full. A full freezer retains temperature much longer than a half-empty one. If you typically have empty space, keep water-filled containers or ice packs in the freezer — they act as thermal mass that extends safe temperatures during an outage.
• Know where the refrigerator and freezer temp settings are. After a long outage, you may want to set the refrigerator to its coldest setting temporarily while it re-cools. Know where the controls are before you need them.

During the Outage

Refrigerator & Freezer

• Keep doors closed. Every opening lets cold air out and warm air in. A refrigerator with the door kept closed stays at safe temperatures for approximately 4 hours. A full freezer holds for 24–48 hours.
• Do not add warm items. If the outage is extended, don't put room-temperature items into the refrigerator — they accelerate temperature rise inside the cabinet.
• Use a refrigerator thermometer. If the outage extends beyond 4 hours, a thermometer tells you whether the interior has risen above 40°F (the food safety threshold) when you do open the door.

Other Appliances

• Unplug washers, dryers, and dishwashers. These appliances have control boards that are vulnerable to power surges. During an extended outage — especially one caused by a storm — unplug them to protect the electronics.
• Unplug smart appliances. Smart refrigerators, computerized ranges, and connected washers are particularly vulnerable to voltage surges because they have active electronics even when not in a cycle.
• Do not start laundry if a storm is in progress. A power interruption mid-cycle leaves wet clothes sitting in the drum and can cause the washer to error out in a state that requires a technician to reset in some models.

When Power Returns: What to Check

• Refrigerator: The compressor will start and run more continuously than normal while it re-cools the interior — this is expected and normal. Check that it's actively cooling within 30–60 minutes. If it runs for 2+ hours without the interior getting cold, the start relay or compressor may have been damaged by the surge.
• Washing machine: If it was in the middle of a cycle during the outage, check whether it resumes or shows an error code. Many modern washers will resume mid-cycle; others require a reset. If the display is blank or behaves erratically, the control board may have been damaged.
• Dishwasher: Run a short cycle to confirm it fills, heats, and drains normally. If it doesn't start or displays an error, reset by holding the Start button for 3–5 seconds on most models.
• Food safety check: If the outage lasted more than 4 hours, check refrigerator food with a thermometer. Discard anything that was above 40°F for more than 2 hours. When in doubt, throw it out.

Signs Your Appliance Was Damaged by a Power Surge

• Display is blank, flickering, or showing garbled characters after power returns
• Appliance doesn't turn on at all even after plugging back in and checking the breaker
• Refrigerator runs but doesn't cool — compressor start relay or board may be damaged
• Burning smell from the appliance after power returns
• Error codes that weren't present before the outage and won't clear

If your appliance shows any of these signs after a power outage, call HomeHeroes at (704) 512-0111. Surge damage to start relays and control boards is one of the most common post-storm repair calls we handle.

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