Denso BHT-300B User Manual page 145

System Program malfunction
Problem
During execution of System Program, the System Program has
attempted to write onto the write-protected area of the memory.
(xxxxxxxx: Error address)
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 displayed message
and codes and contact your nearest dealer.
Problem
During execution of System Program, the System Program has
received an invalid command code.
(xxxxxxxx: Error address)
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 displayed message
and codes and contact your nearest dealer.
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Chapter 4 Error Messages