9 Proheat diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| Err 01 | — | No Start | View fix |
| Err 02 | — | Flame Out | View fix |
| Err 03 | — | Low Voltage | View fix |
| Err 04 | — | Overheat | View fix |
| Err 05 | — | Over-Voltage | View fix |
| Err 06 | — | Fuel Pump | View fix |
| Err 07 | — | Coolant Pump | View fix |
| Err 08 | — | Combustion Fan | View fix |
| Err 09 | — | Glow Plug | View fix |
Same codes keep coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
AM Fleet Integrity gives you QR-code operator reporting, preventive maintenance scheduling, and predictive alerts in one place. Start your 14-day free trial — no credit card required.
Start your free trial