Why Is Only Part of My House Without Power?

If only part of your house has lost power, the problem is usually affecting one circuit, part of the switchboard or part of the electrical supply rather than the entire property.

Common causes include a tripped circuit breaker or safety switch, faulty appliance, damaged wiring, failed electrical connection, switchboard fault or an issue with the incoming electricity supply.

For example, you might still have lights but no power points, or one side of the house may work while another does not.

If the cause is not immediately obvious, MPV Group provides electrical fault finding across Sydney to locate the problem and restore power safely.

A partial power outage means electricity is still available in some parts of the property while other circuits, rooms or appliances have lost power.

You might notice: Lights work but power points don’t or Upstairs has power but downstairs doesn’t or Only one room, garage or section of the home has stopped working.

Because different parts of a house are supplied by different electrical circuits, a fault affecting one circuit may leave the rest of the home operating normally.

A tripped circuit breaker is one of the first things to check when only one part of the home has lost power.

Circuit breakers protect individual circuits. If one trips, only the equipment supplied by that particular circuit may lose power. This could affect a group of power points, lighting, an air conditioner, oven, hot water system or another dedicated circuit.

If the same breaker repeatedly trips after being reset, do not keep switching it back on. Read our guide to what it means when a circuit breaker keeps tripping for the common causes and when professional testing is needed.

A safety switch or RCD can also disconnect power to part of the home when it detects an electrical fault.

This can happen because of a faulty appliance, damaged wiring, moisture or another leakage fault. Depending on how your switchboard is configured, only the circuits protected by that particular device may lose power.

If the RCD keeps turning off or will not reset, see our guide to why a safety switch keeps tripping. Repeated tripping needs fault finding rather than repeated resets.

Sometimes the problem starts when an appliance is switched on. A faulty dishwasher, washing machine, dryer, heater, oven, air conditioner or other appliance can cause protection at the switchboard to operate.

If you notice that the outage happened immediately after using a particular appliance, stop using that appliance until the cause has been identified. The problem could be in the appliance, outlet, circuit or electrical wiring supplying it.

If several power points in the same area stop working but the rest of the house is fine, they may be connected to the same circuit.

A damaged connection, wiring fault, failed outlet or switchboard issue can interrupt electricity further along that circuit. This is why one faulty point can sometimes appear to affect multiple outlets.

Do not remove power points or switches to investigate the wiring yourself. A licensed electrician can test the circuit and locate where electricity is being lost.

In a home with three-phase electricity, loss of one phase can sometimes cause only part of the property to lose power.

Some circuits may continue working while others connected to the affected phase stop operating. This can make the problem look like several unrelated circuits have failed at once.

A phase loss could involve the property, switchboard or electricity supply and should be professionally assessed. If multiple unrelated parts of the house suddenly lose power while others remain normal, contact an electrician rather than repeatedly resetting the switchboard.

If part of the house has no power but all circuit breakers appear to be on, the fault may be somewhere other than a simple tripped breaker.

Possible causes include: A loose or failed electrical connection, damaged wiring, switchboard fault, failed circuit protection or a supply problem.

In a three-phase property, loss of one phase can also produce this symptom. If there is no obvious tripped device, professional electrical fault finding is usually the safest next step.

Your lighting and power points are normally supplied by separate circuits, so one can continue operating even when the other has lost power.

For example, a tripped power circuit could leave your lights operating normally while several outlets stop working. The reverse can also happen. Check the switchboard for a tripped breaker or safety switch, but don’t assume the issue is harmless simply because the rest of the house still has electricity.

If one room has lost electricity, the issue may involve the circuit supplying that area, a faulty connection or individual electrical equipment within the room.

First determine whether the problem affects: one appliance, one power point, or everything in the room.

That information can help narrow down the likely fault. If multiple outlets or lights have stopped working together, an electrician should test the circuit rather than individual appliances alone.

Different power points can be connected to different circuits, even when they are relatively close together.

If one circuit trips or develops a fault, outlets connected to another circuit may continue operating normally. A single faulty connection can also sometimes interrupt other outlets further along the same circuit.

MPV Group’s residential electrical services in Sydney include fault finding, power-point repairs, switchboard work and circuit upgrades.

Potentially. Older switchboards, ageing circuit protection, damaged components or poor electrical connections can contribute to unreliable power and circuit faults. However, partial power loss does not automatically mean the entire switchboard needs replacing. The fault should be diagnosed first.

If the board contains ageing protection, ceramic fuses, heat damage or insufficient capacity, a switchboard upgrade in Sydney may then be recommended. MPV’s existing switchboard service specifically addresses outdated protection, frequently tripping circuits and capacity limitations.

There are a few things you can safely observe without opening electrical equipment.

Check whether neighbours have power: If nearby properties are also affected, there may be a wider electricity network problem.

Look at the switchboard: See whether a circuit breaker, RCD or safety switch has visibly moved to the OFF or tripped position.

Think about what happened immediately before the outage: Did you turn on an appliance? Did the power disappear during rain? Was there a bang, burning smell or flickering?

Unplug obvious appliances if safe: If one appliance appears to have triggered the outage, stop using it. If a breaker or safety switch trips again after one reset, leave it off and arrange professional testing.

Do not remove the switchboard cover, dismantle power points or try to repair electrical wiring yourself. You should also avoid repeatedly resetting a breaker or safety switch that continues to trip.

The protective device may be responding to a genuine fault. Repeatedly switching it back on does not fix the underlying problem.

A partial outage following rain can indicate moisture affecting an outdoor circuit, electrical fitting or connected equipment.

Possible areas include outdoor power points, garden lighting, pool equipment, garages, pumps, balconies and external wiring. The problem may disappear when conditions dry out and then return during the next period of rain.

That does not mean the fault has repaired itself. If electrical tripping or partial power loss repeatedly occurs in wet weather, leave the affected circuit off and arrange fault finding.

If the outage happened when a heater, oven, air conditioner or another appliance started, the circuit may have overloaded or the appliance may have a fault. This is especially useful information for the electrician.

Tell them: what was switched on, which area lost power and whether anything tripped at the switchboard.

That can make electrical fault diagnosis much more efficient.

Yes. If the electrical demand on one circuit becomes too high, its circuit breaker can operate while other circuits remain unaffected.

This is why you may lose a group of outlets but still have normal power elsewhere.

If overloading happens regularly, the home may need additional circuits or greater electrical capacity rather than simply changing how appliances are plugged in.

MPV Group provides electrical upgrades in Sydney for homes where ageing or overloaded electrical systems are no longer meeting modern power demands.

It can be. If you simply have one tripped circuit with no other warning signs, the situation may not always require an emergency response.

However, partial power loss becomes more urgent when accompanied by: Burning smells | Smoke | Sparks | Buzzing or crackling | Hot power points | A hot switchboard | Electric shocks | Visible electrical damage

It can also warrant urgent investigation if several unrelated circuits suddenly fail but the switchboard appears normal.

MPV Group provides emergency electrical services across Sydney for urgent power loss, switchboard failures and unsafe electrical faults. If there is smoke, fire or an immediate threat to people or property, move to safety and contact emergency services.

Potentially. If lights were flickering, pulsing or dimming before parts of the property lost power, tell your electrician.

Flickering may sometimes be connected to a loose electrical connection, circuit issue, switchboard problem or supply fault.

Our guide to flickering lights in Sydney homes explains the warning signs worth investigating.

Not automatically. A single faulty circuit, appliance or electrical connection can cause partial power loss without requiring a complete rewire. However, older homes with deteriorated wiring, repeated faults and an ageing switchboard may need broader electrical work.

The correct first step is diagnosis. Don’t jump straight from “one circuit has failed” to “the whole house needs rewiring” without identifying the fault.

Electrical fault finding aims to determine where the power stops and why. Depending on the symptoms, an electrician may test the affected circuit, circuit breakers, safety switches, switchboard, outlets, appliances, connections and wiring.

If multiple circuits are affected, the incoming electrical supply may also need to be considered. The required repair then depends on what testing finds.

Sometimes it may be a relatively localised fault. Other cases may involve switchboard or broader electrical upgrades.

A partial power outage can be confusing because some parts of the home continue operating normally. But that pattern often provides an important clue. The problem might be:

Tripped circuit → Safety switch → Faulty appliance → Wiring fault → Switchboard issue → Supply issue

Rather than guessing which one it is, have the affected electrical system properly tested.

MPV Group provides electrical fault finding across Sydney for homes, apartments and strata properties.

Only part of your house has power? Contact MPV Group to locate the fault and restore the affected circuit safely.