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.
Accuracy notes
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.
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.
Related · Norcold refrigerator
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DC input voltage too high. The 12V supply to the refrigerator control… 10 flashes
Communication lost between the refrigerator's controls (the… AC HE
AC heater fault. The control cannot run the 120V AC heating element… AC rE / Sr CL
The AC relay on the rear power board is stuck closed, so the control can… dr
Door-open alarm. The refrigerator door has been left open longer than…
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.)
● Checked against 1 manufacturer document · Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual. How we verify