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Home Standby Generator Fault Codes

What do the Fault Codes mean on my home standby generator system?

PLEASE NOTE: The normal output of the generator's digital display will show the total hours of run time for the unit. Unless the letters "FC" are present, there is no fault condition and the default hour meter is being displayed.

Servicing the System

Before performing any generator maintenance, always perform the following steps:

  1. Set generator's circuit breaker to its OFF position.

  2. Set control panel system switch to OFF.

  3. Utility voltage is present at generator control panel. Disconnect power before servicing control panel by removing the fuses from the transfer switch.

  4. After all servicing has been completed, replace fuses in transfer switch, replace 15 Amp fuse in control panel, set system switch and circuit breaker ON and reset exercise timer. (See Setting Exercise Timer).

Fault Detection System

The generator may have to run for long periods of time with no operator present. For that reason, the system is equipped with sensors that automatically shut down the generator in the even of potentially damaging conditions, such as low pressure, high temperature, over speed, and other conditions.

The generator's control panel has a digital display that shows fault codes, like "FC_1". The table below lists the detected fault, the fault code as displayed on the control panel, and the number of LED flashes (also described as 'blinks') seen on the remote LED indicator.


Home Standby Fault Codes Code FC_1 Code FC_2 Code FC_3 Code FC_4 Code FC_5 Code FC_6 Code FC_7 Code FC_8

Reset Fault Detection System

The operator must reset the fault detection system each time it activates. To do so, place the control panel system switch in the OFF position for 30 seconds or more. Remedy the fault condition, then return the generator to service by installing the 15 Amp fuse, placing the system switch in the AUTO position, and resetting the exercise timer. See Setting Exercise Timer in Operation.

A description of each fault and suggested remedies are as follows:

No LED - Discharged Battery

If there is a detected fault condition but the LED is not blinking, this is because the battery is completely discharged. To remedy the problem, remove the 15 Amp fuse and disconnect the battery store for analysis. Reinstall battery after it has been fully recharged, connecting the NEGATIVE cable last. Then reset the fault detection system, as described earlier.

The remote LED indicator is installed at a convenient inside location. The LED will remain lit when the generator is in AUTO. Should a system fault be detected, the LED will turn on and off in a series of blinks that identify the problem. The blink pattern is repeated with a brief pause between each series of blinks.

Low Battery Voltage (FC_1)

This fault is indicated by fault code FC_1 and one blink on the LED indicator. This condition occurs if the generator cannot start because the starting battery output power is below that needed to crank the engine. Causes for this problem may be a faulty battery or battery charge circuit.

To remedy this problem, contact your local service center to check the battery charge output. Remove the 15 Amp fuse and disconnect the battery from the generator. Take the battery to a local battery store for analysis.

Reinstall the battery (replace if necessary - see Battery in Final Installation Considerations in the installation manual). Then reset the fault detection system, as described earlier.

Low Oil Pressure (FC_2)

This fault is indicated by fault code FC_2 and two blinks on the remote LED indicator. The unit is equipped with an oil pressure switch that uses normally closed contacts held open by engine oil pressure during operation. Should oil pressure drop below the 8 psi range, switch contacts close and the engine is shut down.

To remedy the low oil pressure condition, add the recommended oil to the FULL mark on the dipstick.

If the low oil pressure condition still exists, the engine will start, then shut down again. The fault code will appear and the LED will flash. In this case, contact an authorized service dealer.

Low Voltage (Generator, FC_3)

This fault is indicated by fault code FC_3 and three blinks on the LED indicator. This condition is caused by a restriction in the fuel flow, a broken or disconnected signal lead, a failed alternator winding, the control panel circuit breaker is open, or the generator is overloaded.

To remedy the problem, contact your installer or an authorized service dealer.

Engine Fail To Start (FC_4)

This fault is indicated by fault code FC_4 and four blinks on the LED indicator. This feature prevents the generator from damaging itself if it continually attempts to start in spite of another problem, such as no fuel supply. Each time the system is directed to start, the unit will crank for 10 seconds, pause for 10 seconds, and repeat. If the system does not begin producing electricity after approximately 2 minutes, the unit will stop cranking and the LED will blink.

Check to make sure the generator's circuit breaker is in the ON position in order for the sensing leads to verify that the unit is running.

The most likely cause of this problem is no fuel supply. Check the internal and external fuel shut off valves to ensure they are fully open. Other causes could be failed spark plug(s), failed engine ignition, or the engine air filter is clogged. You may need to contact your installer for assistance if you can't remedy these problems.

Low Frequency (FC_5)

This fault is indicated by fault code FC_5 and five blinks on the LED indicator. This feature protects devices connected to the transfer switch by shutting the generator down if the engine runs slower than 55 Hz for three seconds.

This condition is caused by a failed engine component or by excessive loads on the generator. To remedy the problem, contact your installer or an authorized service dealer.

Engine Overspeed (FC_6)

This fault is indicated by fault code FC_6 and six blinks on the LED indicator. This feature protects devices connected to the transfer switch by shutting the generator down if the engine happens to run faster than the preset limit. The overspeed fault is detected as follows:

  • If the generator output frequency is 65-70 Hz, after three seconds, the generator will shut down.

  • If the generator output frequency is greater than 70 Hz, the generator will shut down immediately.

This condition is caused by a failed engine component. To remedy the problem, contact your installer or an authorized service dealer.

High Temperature (FC_7)

This fault is indicated by fault code FC_7 and seven blinks on the LED indicator. The contacts of the temperature switch are normally open. If the engine temperature exceeds approximately 115°C (240°F), the fault is detected and the engine shuts down.

Common causes for this condition include running the unit with all access doors removed, obstructed air inlet or exhaust port, low oil or coolant level, or debris in the engine compartment or radiator.

To resolve the problem, let the engine cool down and remove any accumulated debris and obstructions. Ensure that all access doors are installed whenever the unit is running.

Transfer Switch Fault (FC_8)

This fault is indicated by fault code FC_8 and eight blinks on the LED indicator (if transfer switch is equipped with fault detection).

The most likely cause of this fault is a blown fuse in the transfer switch. To remedy the problem, contact your installer or an authorized service dealer.

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