Denso BTH-300BW User Manual page 164

Error in System Mode settings
Problem
Your settings made in System Mode contain an error.
If this error occurs, the System Mode settings revert to the
factory defaults.
The BHT displays this error for three seconds and runs a user
program first loaded in the BHT from the beginning. The
program may not be the auto-start executable program that has
been specified before occurrence of the error.
If no user program is loaded in the BHT, this error message will
be followed by a window asking whether or not to run the code
scanning demo.
Solution
Make your settings in System Mode again.
If the window asking whether to run the code scanning demo
appears, activate System Mode and download user programs on the
DOWNLOAD menu.
(For the downloading procedure, refer to Chapter 2, Section 2.5.3,
[ 2 ]. For the start-up way of user programs, refer to Section 2.7.)
System down error
Problem
An error has occurred during execution of System Program.
If this error occurs, the BHT beeps five times (for 0.1 second per
beep).
Solution
Unload and reload the battery cartridge, then turn the BHT on.
If this error occurs frequently, make a note of the message and codes
on the LCD and contact your nearest dealer.
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Chapter 4 Error Messages