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Eleven classes of errors are detected and indicated by various error codes (Error 0, Error 1, etc.) used by the 5 series E machines (and later the three constant memory versions). Several error types and error codes are common to all series E machines and these are listed below:
Division by zero, Sqrt of negative number, etc. Error 0 Register Overflow, 9.999999999 E99 Error 1 Self-check failure Error 9Of course, the self-check error code means there is something drastically wrong with the calculator. Perform the self-check by pressing STO then ENTER. Note: On the series E machines, this self-check will erase data AND program memory. On the HP-33C, 34C, and 38C, these are preserved.
The error codes are consistent within the same classification of machine, scientific or financial. There are two inconsistencies, however, that will provide confusion to users who switch between a financial model and a scientific one. An HP-37E or HP-38E (or 38C)user would be confused if he saw an error 3 when using an HP-32E, because he usually sees error 3 when working with amortization or IRR problems and the HP-32E doesn't have these functions. It is obvious that more error codes are needed in complex finance calculations dealing with cash flows and IRR analysis, but the inconsistency of improper memory addressing being error 2 for the scientifics and error 4 for the financials is important for the user to be aware of.
Here's the full list:
Error Type 31E 32E 33E/C 34C 37E 38E/C Improper mathematics operation 0 0 0 0 0 0 Storage Register Overflow 1 1 1 1 1 1 Accessing non-existent memories 2 2 2 2 4 4 Improper statistics operation N/A 3 3 3 2 2 GTO or GSB to a non-existent number N/A N/A 4 4 N/A N/A Amortization or IRR error N/A N/A N/A N/A 3 3 Compound Interest/Annuity Error N/A N/A N/A N/A 5 5 Cash Flow Error (N too large) N/A N/A N/A N/A N/A 6 IRR - all cash flows + or - N/A N/A N/A N/A N/A 7 Calendar date improper format N/A N/A N/A N/A N/A 8 Self-check failure 9 9 9 9 9 9