Warning: This guide is a high-level summary. Follow the official manufacturer manual and all local electrical/safety codes. Use qualified installers for electrical and mechanical work.
Navigate to the InPt menu. Set the exact sensor type. For example: crawford cdm9 950 installation manual
The manual advises a "dry run": power the controller without connecting the load. Verify the display illuminates and no error codes (e.g., "S.ERR" for sensor break) appear immediately. Warning: This guide is a high-level summary
Even with the Crawford CDM9 950 installation manual in hand, mistakes happen. Here is a troubleshooting guide derived from the manual’s appendix: Ambient Conditions: -10°C to +50°C (14°F to 122°F);
| Error Display | Probable Cause | Manual’s Fix |
| :--- | :--- | :--- |
| S.ERR | Sensor broken or wired backwards | Check polarity (thermocouple: red = negative, yellow/white = positive). |
| UUUU | Input over-range (>10% above max) | Sensor short circuit (for RTD) or wrong Lin.H scaling. |
| LLLL | Input under-range | Thermocouple reversed or sensor disconnected. |
| AL1 flashing | Alarm 1 active | Normal operation; check if relay is wired correctly. |
| Erratic PV | Electrical noise | Move signal wires away from power wires. Check shield grounding. |
| Output LED on, but load cold | Blown fuse or no power to load | Check external 2A fuse. Verify the relay contacts are closing (measure continuity). |