Wharfedale Pro MP 1200 Operating Manual page 8

Etensive Thermal Protection
All though the MP Series of amplifier feature powerful cooling fans it is possible that there will be an abnormally high temperature
rise under some circumstances. When this happens special sensors will cause the amplifier to protect itself by first disconnecting the
loudspeakers and then by shutting down the power supply until the temperature drops to a more normal temperature.Normal
operation resumes automatically once the amplifier cools down.
Output Short Circuit
The output lines can be accidentally shorted together either by crossing the speaker wires or because of defective loudspeakers. If
the short circuit remains in place then the thermal proteciton system will eventually operate to power down the complete amplifier.
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