Overcrowding at Victoria meant passengers were unable to get onto the Underground, and were queuing out into the train station.
Commuters complained that this was the second day in a row that they had put up with a poor service.
Delays on various underground lines this morning pic.twitter.com/w7CNRmLQZl— London Victoria (@NetworkRailVIC) October 13, 2015
One commuter said she had to wait for nine trains before being able to continue her journey.
Finsbury Park station & the Victoria line making the morning's commute unbearable day by day. Waited for 9 trains to get on today. @TfL— Jessica Choi (@jessicabokchoi) October 13, 2015
The bedlam that is everyone attempting to enter Victoria Underground station... pic.twitter.com/PsStA1maCR— Sarah-jane Sewell (@sarahjanesewell) October 13, 2015
So where are the Victoria Station Management when there is chaos in place— paul andrew wait (@pawait) October 13, 2015
Wtf is goin on at Victoria station everyday I can't get a tube because of the massive que... Sort it out.— Georg' (HairbyGeorg) (@GeorgiaDelaney) October 13, 2015
There were severe delays on the entire Circle and Hammersmith & City Line because of the fault during rush hour.
"Please avoid using the line if at all possible," the operator said regarding both lines. TfL was advising commuters to seek alternative routes in, including using local buses.
The Metropolitan Line was down between Baker Street and Aldgate while there were severe delays between Wembley Park and Baker Street, Transport for London said.
The District Line is also suffering from minor delays between Earl's Court and Wimbledon/Richmond because of the same problem.
Severe delays on the entire line while we fix a signal failure at Kings Cross.— Circle line (@circleline) October 13, 2015
No service between Baker Street and Aldgate while we fix a signal failure at Kings Cross. Good service on the rest of the line.— Metropolitan line (@metline) October 13, 2015
Severe delays on the entire line while we fix a signal failure at Kings Cross.— Hammersmith & City line (@hamandcityline) October 13, 2015
And the fault was causing disruption throughout the Tube network, with commuters complaining lines were affected as far out as Harrow.