Coca-Cola Championship leaders Wolves enjoyed their best day for several weeks without taking to the field.
After a miserable run of form, Mick McCarthy's team could have been joined on 63 points at the summit by Birmingham, but Blues wasted their chance as they crashed 1-0 at Coventry.
The Sky Blues were full value for the victory which came courtesy of Scott Dann's second-minute tap-in.
Reading could have snatched second place from Birmingham but they were also defeated, 2-0 at home to Bristol City.
Dele Adebola's close-range header (26) put the Robins ahead before Cole Skuse prodded in a second three minutes after the break
Gary Johnson's men are now fourth after Preston were surprisingly beaten 3-1 at second-bottom Southampton.
Andrew Surman (19) and Marek Saganowski (29 and 42) put Saints three up by half-time before Ross Wallace (73) scored a consolation.
Sixth-placed Sheffield United twice came from behind to draw 2-2 at out-of-form Plymouth.
Debutant Carl Fletcher volleyed Argyle ahead (49), Danny Webber slotted home an equaliser after goalkeeper Romain Larrieu's poor clearance (63), before Paul Gallagher (70) and Greg Halford (70) traded goals.
Burnley could not overhaul the Blades as they also drew, Jamie Cureton (20) putting Norwich ahead at Carrow Road before Steven Thompson (36) made it 1-1.
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