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uk Home & property emergencies circuit breaker won't reset • breaker won't stay on • no power on one circuit • fuse box won't reset • consumer unit tripped • mcb keeps tripping • rcd keeps tripping • rcbo keeps tripping • trip switch won't reset • power out in one room • sockets not working one circuit • lights out on one circuit • breaker trips immediately • breaker clicks off again • electrics tripping repeatedly • possible electrical fault • burning smell from fuse box • damp socket tripping

What to do if…
your circuit breaker will not reset and you still have no power on that circuit

Short answer

Treat a breaker that won’t reset as a safety shut-off: stop trying to “force it”, isolate the circuit, and get a qualified electrician (or your landlord/agent) to investigate.

Do not do these things

  • Don’t keep flicking the breaker back on repeatedly “to see if it holds” — that can worsen overheating or damage.
  • Don’t swap fuses/breakers, bypass anything, or try DIY wiring repairs.
  • Don’t keep using an appliance you suspect is involved (even if it “still works” elsewhere) until it’s checked.
  • Don’t touch sockets/switches that are hot, buzzing/crackling, scorched, damp, or smell of burning.
  • Don’t use water near the consumer unit/fuse box, sockets, or any suspected fault area.

What to do now

  1. Pause and check for danger signs. If you smell burning, see smoke, hear crackling/arcing, or the consumer unit is hot: switch off the main switch only if it’s safe to do so, move people away, and call 999 for the fire service if there’s any sign of fire/smoke.
  2. Make sure it really is just one circuit. If multiple circuits (or the whole home) are off, or neighbours are also out, treat it as a power cut rather than a single-circuit fault and contact your electricity network operator (in Great Britain you can call 105 for power-cut help).
  3. Unplug everything on the affected circuit. Unplug appliances and chargers in the rooms that are out. Also switch off anything hard-wired you can safely isolate (e.g., fused spur to an appliance) without opening covers.
  4. Reset safely (one attempt, then stop).
    • Identify the tripped device (often an MCB for one circuit, or an RCBO; sometimes an RCD has also tripped).
    • For the affected device: move it fully to OFF, then back to ON firmly.
    • If an RCD has tripped: turn all the individual circuit breakers (MCBs/RCBOs) OFF, turn the RCD ON, then turn circuits back on one at a time. Stop when the problem circuit causes a trip again and leave that circuit OFF.
  5. If it won’t reset or trips immediately, keep it OFF. That usually means a continuing fault (in wiring, a socket, a light fitting, water ingress, or an appliance).
  6. Do a quick “what changed?” check (no dismantling). Think about anything recent on that circuit: a heater, kettle, tumble dryer, iron; a new appliance; DIY drilling; a wet area (bathroom/kitchen/outdoor socket); a bulb change; flooding/condensation. This helps you describe the problem clearly.
  7. Contact the right person for your housing situation.
    • If you rent: report it to your landlord/letting agent as an electrical fault and say the breaker won’t reset and you’ve left the circuit isolated.
    • If you own: contact a registered electrician. If you have vulnerable people at home (medical equipment, heating issues), say so when booking.
  8. Keep the rest of the home safe while you wait.
    • Use battery torches (avoid candles).
    • Don’t run extension leads under rugs/doors, and avoid overloading other sockets to “replace” the dead circuit.

What can wait

  • You don’t need to identify the exact fault right now or test devices with tools.
  • You don’t need to move appliances around, open sockets, remove the consumer unit cover beyond its normal access flap, or take anything apart.
  • You don’t need to decide on rewiring/upgrade work today — the priority is simply making the circuit safe and getting it assessed.

Important reassurance

A breaker that won’t reset is often doing its job by cutting power when something isn’t safe. Leaving that circuit off is a protective choice — you’re buying time and reducing risk.

Scope note

This is first-step guidance to stabilise the situation and avoid common, harmful mistakes. An electrician (or your landlord’s contractor) may need to test the circuit and appliances to find the cause.

Important note

This is general information, not professional electrical advice. If you suspect fire, overheating, or arcing, prioritise immediate safety and emergency help. If you’re unsure what’s safe to touch, keep the circuit isolated and wait for a qualified professional.

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