No Power in Half the House? What It Actually Mean

Losing power to half the house while the other half still works almost always means one safety switch or circuit has tripped, not the whole board. Most modern switchboards split a home into two or more zones for exactly this reason. If nothing's tripped and power's still out, that's more serious and needs an urgent call.

Why modern switchboards are split into zones on purpose

A properly set up switchboard doesn't run every circuit in the house off one safety switch. It's split into two, sometimes three, separate RCD zones, so a fault on one, say the kitchen circuit tripping from a faulty appliance, doesn't take out the bedrooms and the rest of the house with it. This is deliberate design, not a flaw, and it's exactly why you can lose power to half the house while the other half runs completely normally.

Older boards, or boards that have never been upgraded, sometimes run the whole house off a single safety switch, which means one fault takes everything out at once.

What to check before you call

Open the switchboard and look for a safety switch or breaker sitting in a different position to the others, most trip to a middle position rather than fully off. If you find one, that's your answer, and you've likely also got a faulty appliance or a fault on that circuit worth identifying before resetting it. Unplug anything recently plugged in on that side of the house first.

When it's more serious than a tripped switch

If every switch and breaker at the board looks normal, in the on position, but part of the house still has no power, that's a different problem entirely. This can point to a loose or damaged neutral connection, either at the switchboard or further back at the street connection, which is a genuine safety issue, not a simple reset. It can also cause voltage fluctuations on the circuits that are still working, sometimes damaging appliances on those circuits.

This scenario needs an electrician, not another attempt at resetting anything. For more on what to do if the switchboard itself is buzzing or showing signs of heat, see our guide on that specific situation.

What we check when we arrive

We isolate the fault safely first, then work through which circuit or zone lost power and why. If it's a tripped switch from a faulty appliance, that's often resolved on the spot. If it's a neutral fault or a deeper wiring issue, we'll explain exactly what's involved and what it needs before anything gets switched back on.

Frequently Asked Questions

Why does only half my house lose power when a switch trips?

Modern switchboards split homes into two or more separate safety switch zones on purpose, so a fault in one zone doesn't take out the whole house. If you lose power to just part of the home, it usually means one zone's safety switch has tripped while the others are still running fine.

What should I check before calling an electrician about partial power loss?

Open the switchboard and look for a switch sitting in a different position to the rest, usually angled to the middle rather than fully off. If you find one, unplug anything recently connected on that side of the house before resetting it, since a faulty appliance is the most common cause.

Is it dangerous if some circuits work and others don't?

Not necessarily, if it's a simple tripped safety switch. It becomes more concerning if every switch at the board looks normal but power's still out to part of the house, since that can point to a loose or damaged neutral connection, which is a genuine safety issue needing an electrician.

Can I just reset the tripped switch myself?

Yes, for a single trip with an obvious cause, like a faulty appliance you've since unplugged. If it trips again immediately after resetting, stop and call an electrician rather than repeatedly resetting it, since that usually means the fault hasn't actually cleared.

What does it mean if nothing's tripped but I still have no power to part of the house?

This usually points to a wiring fault rather than a simple overload, often a loose or damaged neutral connection. It's not something to keep testing yourself, since it can cause voltage issues on the circuits that are still running, which is a genuine safety and equipment risk.

Is partial power loss an emergency?

If it's a straightforward tripped safety switch with a clear cause, it can usually wait for a same-day or next-day booking. If nothing's tripped and part of the house still has no power, treat that as urgent and call for an emergency assessment rather than waiting it out.

No Power in Half the House? What It Actually Means

Why modern switchboards are split into zones on purpose

What to check before you call

When it's more serious than a tripped switch

What we check when we arrive

Frequently Asked Questions

Half your home still without power?