What does this error code mean for the APM Temperature Meter?
The following is a list of error codes and reasons for the APM Temperature Meter.
| Code | Reason |
| USB | Unit is only powered from USB, functionality is limited |
| OPEN | Thermocouple is open circuit |
| VOLT | There is a voltage present on the thermocouple inputs (might be due to a grounded thermocouple) |
| TRNG | Thermocouple voltage is out of range (input voltage is greater than the spec for the type selected) |
| CRNG | Cold junction is out of range |
| OVER | Value is greater than 9999 (ignoring the DP) |