mypros+
Error code reference

Polar Refrigerator Error Code Flash 8

The DC input voltage to the refrigerator is too low.

Polar codesPolar refrigerator codes

The DC input voltage to the refrigerator is too low.

First step from the service manual

Correct the DC input voltage to the refrigerator; make sure the input voltage is 12.0 VDC.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for Flash 8.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What Flash 8 means on a Polar refrigerator

Flash 8 on a Polar refrigerator indicates that the DC input voltage supplied to the unit has dropped below the acceptable operating threshold. This refrigerator is designed to operate on a 12.0 VDC input, and when the control system detects that incoming voltage has fallen below that level, it triggers this fault code to protect the compressor and electronics from damage caused by undervoltage conditions. The code is a direct reading of the power supply quality rather than an internal component failure.

The most immediate diagnostic step is to measure the actual DC voltage at the refrigerator's input connection using a multimeter set to DC voltage. The reading should be at or above 12.0 VDC. Readings significantly below this level point to a problem upstream of the unit itself, such as a weak or partially discharged battery, a failing power supply, or excessive resistance in the wiring between the power source and the refrigerator.

In mobile or off-grid installations, where Polar refrigerators are commonly used, voltage sag is a frequent issue. Long wire runs, undersized cable, corroded terminals, or a battery bank that is not being adequately charged by the vehicle alternator or solar system can all result in the voltage at the refrigerator dropping below 12.0 VDC even when the source nominally reads 12 volts under no-load conditions. Correcting the input voltage by addressing the power source or wiring is required before the fault will clear.

Source: manufacturer service documentation.

Common causes of Flash 8

  1. 01

    Discharged or weak battery

    Wiring / connection

    A battery that is partially or fully discharged will deliver less than 12.0 VDC under load. Measure battery voltage with a multimeter while the refrigerator is connected to confirm the voltage does not drop below 12.0 VDC during operation.

  2. 02

    Undersized or excessively long wiring

    Part replacement

    Wire runs that are too long or too thin in gauge create resistance that causes voltage to drop between the battery and the refrigerator. Check the voltage directly at the refrigerator's input terminals and compare it to the voltage at the battery to identify a wiring drop.

  3. 03

    Corroded or loose terminal connections

    Wiring / connection

    Corrosion or loose connections at the battery terminals, fuse holder, or refrigerator power connector increase resistance and cause voltage drop. Inspect all connection points for oxidation, looseness, or heat discoloration.

  4. 04

    Inadequate charging from alternator or solar system

    Wiring / connection

    If the refrigerator is powered by a vehicle or solar setup, a failing alternator, undersized solar panels, or a faulty charge controller may not be keeping the battery adequately charged. Verify the charging system is delivering sufficient current to maintain battery voltage above 12.0 VDC.

  5. 05

    Failing or undersized power supply

    Part replacement

    In fixed installations using a DC power supply rather than a battery, a power supply that is failing or rated for insufficient current output may sag below 12.0 VDC under load. Test the supply's output voltage while the refrigerator is drawing current.

See the test procedure for each cause

Frequently asked questions about Flash 8

What does Flash 8 mean on a Polar refrigerator?
Flash 8 means the refrigerator is detecting that its DC input voltage is too low. The unit requires a stable 12.0 VDC supply to operate correctly. When voltage drops below that level, the control system triggers this fault to prevent damage to internal components. The issue lies with the power source or wiring rather than the refrigerator itself.
How do I fix Flash 8 on a Polar refrigerator?
Start by measuring the DC voltage at the refrigerator's input terminals with a multimeter while the unit is connected. The reading must be at or above 12.0 VDC. If the voltage is low, trace the problem back to the source, checking the battery charge level, the condition of wiring and connections, and the output of any charging system in use. Correcting the input voltage to 12.0 VDC should clear the fault.
Will resetting the refrigerator clear the Flash 8 error?
Resetting the unit without correcting the underlying power supply issue will not permanently clear Flash 8. The code is triggered by a live undervoltage condition, so the fault will return as long as the input voltage remains below 12.0 VDC. The power source or wiring must be corrected first.
Is it safe to keep running my Polar refrigerator when Flash 8 appears?
It is not advisable to continue operating the refrigerator while the undervoltage fault is active. Running a compressor-based refrigerator on insufficient voltage can cause the compressor motor to draw excessive current, leading to overheating and premature failure of the compressor or control electronics. Address the power supply issue before resuming normal use.
How much does it cost to fix a Flash 8 error on a Polar refrigerator?
The cost depends entirely on what is causing the low voltage condition. If the fix is simply recharging a battery or cleaning corroded terminals, the cost may be minimal. Replacing wiring, a battery, a charge controller, or a power supply can range from around $20 to several hundred dollars depending on the components involved. Have a technician diagnose the power supply system to get an accurate estimate.

Related Polar refrigerator codes

All Polar refrigerator codes
View all 22 Polar refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass