Range from the cheapest fixing an electrical fault £42 (CM ELECTRICAL based in W11) to the dearest fixing of an electrical fault £180 (MGB Electrical Solutions Ltd based in SW6).
Comparing electricians estimates for troubleshooting and diagnosing an electric fault gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to fix an electrical fault in W14 by posting a job with HaMuch and we will send it to electricians in W14.

"Troubleshoot & diagnose electrical fault. Washing machine and dishwasher power doesn't come on. (Dishwasher brand new)"
W14
"Troubleshoot & diagnose an electrical fault. Replace a burnt socket and replace main fuse"
SW3