5 Scotsman — Temperature Probe Fault / Sensor Open Circuit
At a glance
- Severity
- WARNING THEN STOP
- Domain
- REFRIGERATION_SYSTEM
- Reference standard
- EN 378 / EC Regulation 852/2004 (HACCP)
- Product / context
- Failed sump temp sensor
What it means
The control board detects an abnormal value from the cabinet or evaporator temperature probe (open circuit, short circuit, or out-of-range value). NTC 10K reference: 10 kOhm at 25 C, 32.6 kOhm at 0 C, 55.3 kOhm at -10 C. The unit continues to operate in emergency mode but without precise regulation.
Probable causes
- NTC/PTC probe damaged or cable broken.
- Probe connector oxidized or disconnected from the board terminal strip.
- Probe incorrectly positioned after maintenance (not in contact with the evaporator).
- Moisture ingress into the probe cable altering the reading.
Reference values
| NTC 10K resistance table | {"-30C":"173 kOhm","-20C":"97.1 kOhm","-10C":"55.3 kOhm","0C":"32.6 kOhm","10C":"19.9 kOhm","20C":"12.5 kOhm","25C":"10.0 kOhm","30C":"8.06 kOhm","40C":"5.33 kOhm","50C":"3.60 kOhm","60C":"2.49 kOhm","80C":"1.26 kOhm"} |
|---|---|
| note | Values for standard NTC 10K (B=3435). Typical tolerance +/-5%. Short circuit: < 100 Ohm. Open circuit: > 1 MOhm. |
Where to start
Access the unit control panel. Does the display show an abnormal temperature value (e.g., -40 C or +150 C) or dashes / a probe error symbol?
Full guided diagnosis in the app
The diagnostic tree for this fault has 6 guided steps with measurements, checks and resolutions. You'll find it in HorecaIQ, one of the five IndexOS apps: free, works offline.
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The same fault on other brands
More Scotsman codes
- 2 — Ice Machine Harvest Cycle Stuck / Bin Float Fault