Norcold Refrigerator: “dc LO / dc HI”
warning RV refrigerator error codes
What it means
DC voltage faults. 'dc LO' means the 12V DC voltage supplied to the refrigerator is too low; 'dc HI' means it is too high. On 3-way models, 'dc rE' indicates a DC relay stuck closed and 'dc HE' indicates the DC heater failed open. These flag a problem with the 12V supply or DC heating circuit rather than the cooling unit itself.
Most likely causes
- RV 12V supply out of range - acceptable input is about 10.5 to 15.4 Vdc; converter or battery delivering low or high voltage most likely
- Weak/discharged battery, poor connections, or voltage drop on the DC feed (dc LO) common
- Converter/charger overvoltage or alternator overcharge (dc HI) less common
- DC heater open or DC relay stuck closed on 3-way models (dc HE / dc rE) less common
Safe checks you can do yourself
- Measure the 12V supply to the fridge; it should sit roughly between 10.5 and 15.4 volts.
- Note whether the fault appears only when running on the converter/shore power vs. battery, which helps isolate the source.
- Make sure no other appliance or lighting load is sharing/dragging the fridge's DC circuit.
- Check battery state of charge and clean, tight DC connections for low-voltage faults.
How to reset / clear dc LO / dc HI
- Correct the DC supply voltage (charge battery, fix connections, or address converter output) and the fault should clear on the next cycle.
- dc HE / dc rE (heater open / relay stuck) on 3-way models require technician diagnosis of the DC heater and board.
When to call a technician
Call a technician if the DC voltage measures in range but the dc LO/dc HI code persists, or for dc rE / dc HE faults (stuck relay or open DC heater) which involve the power board and heater on 3-way units.
Applies to
N62X/N82X · N64X/N84X · N6XX/N8XX 3-way models (for dc rE/dc HE)
FAQ
What does Norcold Refrigerator code "dc LO / dc HI" mean?
DC voltage faults. 'dc LO' means the 12V DC voltage supplied to the refrigerator is too low; 'dc HI' means it is too high. On 3-way models, 'dc rE' indicates a DC relay stuck closed and 'dc HE' indicates the DC heater failed open. These flag a problem with the 12V supply or DC heating circuit rather than the cooling unit itself.
How do I reset Norcold Refrigerator dc LO / dc HI?
Correct the DC supply voltage (charge battery, fix connections, or address converter output) and the fault should clear on the next cycle. dc HE / dc rE (heater open / relay stuck) on 3-way models require technician diagnosis of the DC heater and board.
What is the most common cause of dc LO / dc HI on a Norcold Refrigerator?
The most likely cause is rv 12v supply out of range - acceptable input is about 10.5 to 15.4 vdc; converter or battery delivering low or high voltage.
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Sources
- Norcold N6XX/N8XX Models Refrigerator Service Manual — Publication 619394E, 'dc LO Fault Code – Low DC voltage' (p.13), 'dc HI Fault Code – DC voltage high' (p.14), 'dc rE' / 'dc HE' (3-way models, pp.14-15); Displayed Fault Codes tables (pp.8-9). Acceptable input 10.5-15.4 Vdc. (Norcold, Inc.)
Note: dc rE and dc HE apply only to 3-way (12V-heater) models. Display wording is from N62X/N82X and N64X/N84X manuals; N61X/N81X represent these via LED patterns. Voltage thresholds (10.5-15.4 Vdc) are the manual's stated input range.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.