Dometic Refrigerator: “Constant red LED”
warning RV refrigerator error codes
What it means
Temperature sensor error. The fridge's temperature sensor is reading as defective (open or short circuit), so the controller cannot regulate cooling and signals a continuous red indicator.
Most likely causes
- Failed temperature sensor / thermistor most likely
- Disconnected, pinched, or corroded sensor wiring or connector common
- Faulty electronics unit not reading the sensor correctly less common
Safe checks you can do yourself
- With power off, inspect the temperature sensor connector and wiring for looseness, corrosion, or pinching and reseat the connector if accessible.
- Verify the sensor lead has not been dislodged inside the cabinet.
- Power-cycle the fridge to confirm the indicator stays constant rather than flashing a numeric fault.
How to reset / clear Constant red LED
- Reseat the sensor connection if it was loose, then power off for about a minute and power on again.
- If the sensor or wiring is damaged it must be repaired/replaced for the indicator to clear.
When to call a technician
Wiring looks intact but the indicator stays constantly lit — the sensor or electronics unit needs testing and replacement by a service technician.
Applies to
CRX50 · CRX65 · CRX80 · CRX110 · CRX140 · NRX0035 · NRX0050 · NRX0060 · NRX0080 · NRX0115 · NRX0130 · NRX1035 · NRX1050 · NRX1060 · NRX1080 · NRX1115 · NRX1130
FAQ
What does Dometic Refrigerator code "Constant red LED" mean?
Temperature sensor error. The fridge's temperature sensor is reading as defective (open or short circuit), so the controller cannot regulate cooling and signals a continuous red indicator.
How do I reset Dometic Refrigerator Constant red LED?
Reseat the sensor connection if it was loose, then power off for about a minute and power on again. If the sensor or wiring is damaged it must be repaired/replaced for the indicator to clear.
What is the most common cause of Constant red LED on a Dometic Refrigerator?
The most likely cause is failed temperature sensor / thermistor.
Related · Dometic refrigerator
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Sources
- Dometic CRX 50/65/80/110/140 Installation and Operating Manual — Troubleshooting, error indicator LED table — 'Constantly / Temperature sensor errors' (Dometic)
- Dometic NRX 35-130 Operating Manual (AMER) — Troubleshooting, flashing frequency table — 'Constantly / Temperature sensor errors' (Dometic)
Note: Dometic lists this as the LED illuminating 'constantly' rather than a counted flash pattern, which distinguishes it from the numbered faults.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.