The consumer unit distributes electricity and houses protective devices, so heat, crackling, visible damage, repeated tripping or new, persistent fuse box buzzing deserves proper assessment. TRACEFORM provides 24/7 help for urgent consumer-unit faults and can assess whether a safe repair, isolation or replacement is appropriate. Replacement is not assumed merely because a unit is older; the condition, fault and wider installation need to be understood.
Symptoms to report
Describe whether the noise is continuous or occurs only with a particular load, whether any switch has operated, and whether there is warmth, discolouration, an acrid smell or loss of circuits. Keep clear if there are signs of burning or arcing. Never remove the cover, tighten terminals or spray anything into the enclosure.
Fuse box keeps tripping, buzzing or getting warm
- Fuse box keeps tripping: often an appliance or circuit fault, sometimes a worn device in the board
- Buzzing or crackling: can be a loose connection or a failing breaker and needs testing
- Warm casing, scorch marks or a burning smell: switch off at the main switch if safe and call us now
- A fuse that keeps blowing in an old rewirable fuse box: a fault on that circuit needs tracing
- Water near the fuse box: keep clear and do not touch it
How the unit is assessed
The electrician checks the reported symptoms, visible condition and operation of the installation, then isolates and tests as required. A sound can originate from a protective device, connection or equipment elsewhere, so diagnosis should establish the source rather than relying on the word 'buzzing'. The condition of affected circuits may also need testing before they are returned to service.
Repair, replacement or isolation
Some faults can be addressed with a targeted repair or replacement component where suitable and safe. Significant damage, incompatibility, condition or the scope of required work may make consumer-unit replacement the appropriate recommendation. If immediate completion is not possible, the unsafe part may need to remain isolated. The electrician will explain what can and cannot be used.
Managed and commercial properties
For landlords and businesses, provide access information, the person authorised to approve work and details of circuits serving tenants, customers or critical operations. Isolation may affect shared areas or several occupiers. Relevant test results or certification depend on the work actually undertaken; an emergency repair does not itself constitute a full EICR.
After the visit
You should receive a clear account of the observed fault, any isolation or repair, safe-use restrictions and recommended follow-on work. If broader installation condition needs assessment, an EICR can be discussed as a separate planned inspection rather than used as a substitute for urgent diagnosis.
When the answer is a planned replacement, not an emergency repair
Not every consumer unit problem is an emergency. If the unit is working but is an older rewirable-fuse board, lacks RCD protection, or has no spare capacity for an EV charger, shower or extension, the better route is a quoted, scheduled consumer unit replacement with the certificate issued when the work is tested. The emergency visit deals with heat, noise, tripping and loss of supply; where no urgent danger is found, TRACEFORM explains what a planned upgrade would involve and quotes it separately rather than replacing a board under emergency conditions.
As a guide, a new split-load consumer unit is typically £460–£665, and a high-integrity or full RCBO board £560–£895, quoted in writing after a survey. See consumer unit replacement for what is included.
