Alto-Shaam Combitherm CT Express (ES and ESG)
Compact combi oven. When an error shows, press Start to acknowledge it; the flashing mode icons are the modes you can still cook in until it is fixed.
What it is: Combi oven. ES (boiler) and ESG (boilerless) versions; boiler codes only apply to ES.
Alto-Shaam Combitherm CT Express (ES and ESG) error codes
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E01 | Low water in boiler | Water supply shut off | Open the supply; check the fill valve. |
| E02 | Control too hot | Cooling fans not running | Check the fans. |
| E03 / E04 | Upper / lower fan motor fault | Motor or its drive (VFD) not powered | Check the drive and motor. |
| E11 | Cavity too hot | Element contactor stuck on | Check the contactor. |
| E13 | Boiler too hot | Element not covered by water (scale or fill fault) | Descale; check fill. |
| E15 | Condenser too hot | Untreated water line off or shut | Open the condenser water. |
| E20 | Single-point core probe (HACCP only) | Probe not fitted | Fit or check the probe. |
| E21 | Cavity probe (N6) open | Probe or connection | Check the probe. |
| E22 | Multipoint core probe (B10) fault | Probe | Cook by time only; replace the probe. |
| E23 / E24 / E25 | Boiler (B4) / bypass (B5) / condenser (B3) probe open | Probe or connection at the relay board | Check the probe. |
| E26 / E27 | Boiler safety probe (N8) open / element too hot | Probe fault or scale | Check the probe; descale. |
| E34 | Steam generator drain fault | Scale or drain pump | Descale; check the pump. |
| E36 | Steam temperature high | Water off | Open the supply. |
| E51 | No water in boiler (fill error) | Supply off | Open the supply. |
| E53 / E54 | Upper / lower fan motor too hot | Motor high limit open | Check the motor and its connection. |
| E55 | Vent not open | Vent motor not powered | Check the vent motor. |
| E57 | No rinse water | Supply off during rinse | Open the supply. |
| E92 / E94 | Display board communication error | Ribbon cable or board | Reseat the cables. |
How to enter service / parameter mode
- Emergency cooking: press Start to acknowledge the error, pick one of the flashing modes, then press Start. Temperature range may be limited.
- Service mode is password protected; the code is in the service manual.
For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.
Based on: Alto-Shaam Combitherm CT Express service manual MN-36008 Rev 9. Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Alto-Shaam or any other manufacturer. Written in our own words from the manufacturer's documentation.