Half Your House Has No Power?

It's a strange feeling when the kitchen lights die but the telly in the lounge keeps going, or the whole back half of the house goes quiet while the front is fine. It's not a full blackout, so it's confusing. The good news is that partial power loss usually has a logical cause, and a lot of it you can safely narrow down yourself in a few minutes. Here's how to work through it calmly, and how to know when it's time to ring a sparky.

First, Check Your Safety Switch

Your home isn't wired as one big loop. It's split into separate circuits, and each one is protected by its own switch at the switchboard. That's exactly why half the house can lose power while the other half carries on. One circuit has tripped, and the switch feeding it has cut the power to just that part of the home.

Head to your switchboard, which is usually in a meter box on an outside wall or in a hallway cupboard. Open the little door and look along the row of switches. Most will be pointing up, in the on position. You're looking for one that has flicked down to off, or has stopped halfway in the middle. That's your tripped circuit.

If you find one, flick it fully off first, then firmly back on. If it stays on and your power comes back, you've likely had a one-off nuisance trip and you're sorted. If it trips straight back off, or won't move back to on at all, leave it off. That is the switch doing its job and telling you there is a real fault on that circuit. Forcing it won't fix anything, and there's no safe way to chase the fault further yourself. For more on why these trip, our guide on why a safety switch keeps tripping walks through the common causes.

Is It Just Your House or the Whole Street?

Before you assume it's a fault inside your home, rule out the network. This one check saves a lot of Northern Beaches homeowners a callout they didn't need.

Step outside and have a look around. Are your neighbours' lights on? Are the street lights working? If the houses around you in Dee Why, Brookvale, or Mona Vale are also dark, or the street lights are out, then it's a network outage and the fault sits with Ausgrid, not your home. Ausgrid runs the poles and wires across the Beaches, and you can check for known outages and report a new one on their website or outage line.

Here's the catch that trips people up. A network problem can sometimes take out just one of the two supply lines coming into your home, which can leave half your house dark while the other half stays on. So if you can't find a tripped switch at your board and your power is still partly out, it's worth checking with a neighbour or two before assuming the worst. If they're fine and you're not, the fault is inside your place.

What You Can Safely Check Yourself

If you've confirmed it's just your place, there are a few safe checks worth doing before you call anyone. None of these involve opening anything up or touching wiring.

1. Try the tripped switch once. Flick it off, then firmly back on. One attempt is fine. If it holds, great. If it drops out again, leave it and move on.
2. Unplug appliances on the dead circuit. A faulty kettle, heater, washing machine, or old fridge is the single most common reason a circuit trips. Unplug everything in the affected rooms, then try the switch once more. If it holds now, plug items back in one at a time to find the culprit. Wait a minute between each one.
3. Think about what changed. Did it happen during heavy rain, right after you plugged something new in, or while the air conditioner and oven were both running? That timing is a strong clue to what's behind it.
4. Check the meter box from the outside only. Have a look for anything obviously wrong you can see without touching, like water pooling in the box or a burnt smell. Don't reach in, don't remove covers, and don't poke at anything.

If unplugging appliances and resetting the switch brings the power back and it stays on, you've probably found and removed a faulty appliance. If the switch still won't hold with everything unplugged, the fault is in the fixed wiring, a power point, or a fitting, and that's a job for a sparky with the right testing gear.

One more thing worth ruling out while you're at it. If the lights in the affected area are dimming or flickering rather than fully off, that can point to a loose connection, which is a different problem. Our guide on why lights flicker covers that in detail.

When It's an Electrical Emergency

Most partial power loss is a nuisance rather than a danger, but some of it is a genuine emergency. Call a licensed electrician straight away, day or night, if any of the following are happening.

• You can smell burning plastic or hot metal near the switchboard or a power point
• There are scorch marks, browning, or heat around a socket or switch
• A switch trips again the instant you reset it, over and over
• Anyone feels a tingle or shock from a tap, appliance, or metal surface
• There's water getting into the meter box or a power point
• Someone in the home relies on medical equipment such as a CPAP machine, oxygen, or a stairlift

Any of those signs alongside a power loss means it should not wait until morning. Burning smells and repeated tripping in particular are the home warning you that something is overheating or leaking, and that's worth acting on quickly. When in doubt, it's always worth a quick phone call to talk it through before it gets worse. Our guide on when to call a 24/7 emergency electrician goes deeper on where the line sits.

When to Call a Licensed Electrician

You've done the safe checks, and it's clearly not a street-wide outage. Here's when it's time to hand it over rather than keep poking at it.

When you do call, a good electrician won't just guess. They'll test the affected circuit, find the exact cause, and give you a fixed price after a free assessment so there are no surprises on the final bill. No opening walls on a hunch, and no vague hourly meter ticking over while they poke around.

The Quick Summary

Half your house losing power almost always means a single circuit has tripped. Start at the switchboard and look for a switch that has flicked off, then try it once. Check outside to see whether the whole street is affected, in which case it's an Ausgrid outage rather than your home. Unplug appliances on the dead circuit to rule out a faulty one. If the switch won't hold, you can't find a tripped switch, or there's any burning smell, heat, or tingle, stop and call a licensed electrician.

Connery Electrical handles partial power loss and no-power callouts across the Northern Beaches every week, from Manly and Balgowlah through to Dee Why, Brookvale, and Mona Vale. We answer the phone, we tell you straight whether it's something you can sort yourself, and we come out same-day where we can. See our emergency electrician service for after-hours help, or our residential electrician page for planned work.

Oscar Connery

Licensed NSW electrician (Licence 473086C) based on the Northern Beaches. Connery Electrical handles emergency callouts, switchboard upgrades, EV charger installation and general residential and commercial electrical work across Manly, Dee Why, Brookvale, Mona Vale and surrounds.