WarningR-290 Self-Contained Cases
R-290 Case Controller / Configuration Fault
The electronic case controller (e.g. Dixell, Carel, Danfoss on plug-in R-290 cases) is misconfigured, alarming, or reading a bad sensor — so the case won't cool right even though the sealed system and fans are fine. Setpoint, defrost, and probe faults dominate here.
Symptoms
- Controller showing a probe/sensor alarm (P1/P2, E0, 'Er') or a flashing fault code
- Case too warm or too cold despite the compressor and fans running normally
- Defrost not running on schedule, or running too long/too often
- Display frozen, blank, or stuck in a service/standby mode
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Likely causes, step-by-step troubleshooting & safety notes
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