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Error code reference

Polar Refrigerator Error Code Flash 5

A flame is sensed at the burner when there should be none present; gas valve is mechanically stuck open.

Polar codesPolar refrigerator codes

A flame is sensed at the burner when there should be none present; gas valve is mechanically stuck open.

First step from the service manual

Replace gas train assembly.

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

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What Flash 5 means on a Polar refrigerator

Flash 5 on a Polar refrigerator indicates that the flame sensor is detecting a flame at the burner during a period when no flame should be present. This points to a gas valve that is mechanically stuck in the open position, allowing gas to flow and ignite even when the control board has commanded the valve to close. The burner system in this refrigerator relies on a gas train assembly that includes the gas valve, flame sensor, and associated control components working in coordinated sequence.

When the control board sends a signal to shut off the gas supply, a properly functioning valve closes immediately, extinguishing the flame. A valve that is mechanically stuck open due to debris, corrosion, a failed solenoid, or internal wear will continue to pass gas regardless of the electrical command signal. The flame sensor then detects the persistent flame and triggers the Flash 5 fault to alert the technician to this unsafe operating condition.

Because the root cause is a mechanical failure within the gas train assembly rather than a wiring or sensor issue, the recommended diagnostic action is direct replacement of the entire gas train assembly. Attempting to clean or manually free a stuck gas valve in the field is not a reliable fix, as internal valve components that have failed mechanically are likely to repeat the failure. This fault represents a potentially hazardous condition and should be addressed promptly before returning the unit to service.

Source: manufacturer service documentation.

Common causes of Flash 5

  1. 01

    Mechanically stuck gas valve

    Part replacement

    The gas valve inside the gas train assembly has failed internally and cannot close when commanded. This is the primary cause of Flash 5 and means gas continues flowing to the burner even after a shutdown signal is issued.

  2. 02

    Debris or corrosion in the gas valve

    Part replacement

    Contamination inside the valve body, such as rust particles or sediment from the gas supply, can physically obstruct the valve mechanism and prevent full closure. Inspection of the gas train will often reveal discoloration or buildup near valve seats.

  3. 03

    Failed valve solenoid causing mechanical binding

    Part replacement

    A solenoid that has partially failed can generate inconsistent magnetic force, causing the valve plunger to seat improperly and remain in a partially open position. This can mimic a purely mechanical fault and still trigger Flash 5.

  4. 04

    Flame sensor malfunction reporting false flame

    Part replacement

    Although less common, a flame sensor that is shorted or contaminated may report a flame signal when none exists. This should be ruled out during diagnosis before condemning the gas valve, but replacement of the gas train assembly addresses both possibilities.

See the test procedure for each cause

Frequently asked questions about Flash 5

What does Flash 5 mean on a Polar refrigerator?
Flash 5 means the refrigerator's flame sensor is detecting a burner flame during a period when the system has commanded the burner to be off. This indicates the gas valve is mechanically stuck in the open position and cannot shut off the gas supply. It is a safety-related fault that requires immediate attention and should not be bypassed or ignored.
Can I fix Flash 5 on my Polar refrigerator myself?
Because Flash 5 involves a stuck gas valve within the gas train assembly, the repair requires replacing the gas train assembly as a unit. Work involving gas train components should only be performed by a qualified technician with experience in gas appliance repair. Attempting to disassemble or manually free a stuck gas valve is not recommended, as it can create a hazardous situation and the valve is likely to fail again.
Is it safe to keep using my Polar refrigerator when it shows Flash 5?
No, the refrigerator should not remain in service while showing Flash 5. A gas valve stuck open means gas is flowing and the burner may be operating outside of normal controlled cycles, which presents a fire and safety risk. Shut the unit down and discontinue use until the gas train assembly has been replaced by a qualified technician.
Will resetting the Polar refrigerator clear the Flash 5 error?
Resetting the control board will not resolve Flash 5 because the underlying problem is a mechanical failure of the gas valve, not a software or sensor glitch. Even if the fault clears temporarily after a reset, the stuck valve will cause the condition to recur and the error will return. The gas train assembly must be replaced to permanently resolve the fault.
How much does it cost to repair a Polar refrigerator with a Flash 5 error?
Repair costs for Flash 5 will vary depending on parts pricing and local labor rates, but technicians should budget for the cost of a complete gas train assembly replacement plus the service call and labor time. Parts costs for gas train assemblies on commercial refrigeration units typically range from moderate to high depending on the model, and total repair costs including labor commonly fall in the range of several hundred dollars. Getting a quote from a certified technician before proceeding is advisable.

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