Sony STR-ZA5000ES Operating Instructions Manual page 19

 Irregular current is output to the speakers due to a short circuit on
the speaker terminals. The receiver will automatically turn off after
a few seconds. If the protective device on the receiver is activated
due to a short-circuit problem, turn off the receiver.
Check the connection of the speakers and turn on the power
again.
UPDATE FAILED
 Insert a USB flash drive on which the package file for updating the
receiver is saved, and then turn the receiver off and turn it on
again.
List of messages after Auto Calibration measurements
Display Explanation
Code 31 Front speakers are not selected properly. Select the front
speakers using SPEAKERS and perform the Auto
Calibration again (page 10).

Code 32, Code 33 Speakers were not detected or not connected properly.

None of the front speakers are connected or only one
front speaker is connected.

Either the surround left or surround right speaker is not
connected.

A surround back speaker is connected only to the
SPEAKERS SURROUND BACK (FRONT B/BI-AMP/ZONE 2)
R terminal. If connecting only one surround back
speaker, connect it to the SPEAKERS SURROUND BACK
(FRONT B/BI-AMP/ZONE 2) L terminal.

Either the Height1 left or Height1 right speaker is not
connected.

Either the Height2 left or Height2 right speaker is not
connected.

The optimizer microphone is not connected. Make sure
that the optimizer microphone is connected properly
and perform the Auto Calibration again.
If the optimizer microphone is connected properly but
the error code still appears, the optimizer microphone
cable may be damaged.
Code 34 Speakers are not placed in the proper position. Speakers
or an optimizer microphone on the right or left may be
placed wrongly. See the supplied Startup Guide and
check the speaker position.
Code 35 The measurement result is not match to the speaker
pattern you set. See the Help Guide and change the
setting to fit the actual speaker pattern.
Display Explanation
Warning 40 The measurement process has been completed and a
high noise level has been detected. You may be able to
achieve better results if you try the process again in a
quiet environment.

Warning 41, The input from the optimizer microphone is too large.

Warning 42 The distance between the speaker and the optimizer
microphone may be too small. Set them further apart
and perform the measurement again.
Warning 43 The distance and position of a subwoofer cannot be
detected. This may be caused by noise. Try performing
the measurement in a quiet environment.
Warning 44 Measurement has been completed. However the
speakers are not placed in the proper position with
respect to each other. See the supplied Startup Guide and
check the relative positions of the speakers.
NO WARNING There is no warning information.
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