Temperature controllers
Partlow MIC 2000 Temperature Controller fault codes
What all 6 Partlow MIC 2000 Temperature Controller fault codes mean, in plain words, with a risk grade for each. These come from the manufacturer's own manual. The fix for each one is in WERCS Diagnose.
Get the fixes · plans from $49/moUpdated July 22, 2026
| Code | What it means | Risk |
|---|---|---|
| Hi | Hi (Input more than 10% Over Span) The input signal is more than ten percent above the top of the selected input span, which causes the outputs to turn off. | YELLOW |
| Lo | Lo (Input more than 10% Under Span) The input signal is more than ten percent below the bottom of the selected input span, which causes the outputs to turn off. | YELLOW |
| Er 3 | Er 3 (EPROM Checksum Failure) A checksum test of the program memory has failed due to corrupted data, which stops the controller from operating. | YELLOW |
| Er 4 | Er 4 (RTD Mismatch Error) The input reading does not match calibration, resulting in a mismatch error on the controller. | YELLOW |
| SnSr | SnSr (Sensor Break or out of range) The instrument input sensor is open or reading outside its acceptable range, which causes the proportional and on off outputs to turn off. | YELLOW |
| Er 11 | Er 11 (Cold Junction Compensation Error) The cold junction reference sensor used for thermocouple compensation is not reading correctly, causing a compensation error. | YELLOW |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.