Frigidaire Cooktop Error Code E77

E77 indicates a break or open circuit in the heat sink temperature sensor for the center cooking zone on a 3-zone induction module. The heat sink sensor monitors the temperature of the power electronics inside the cooktop to prevent overheating. When this sensor circuit is broken, the cooktop disables the center zone and displays E77. Resolving this code requires replacing the generator circuit board for the center cook zone.

The center cooking zone will be non-functional while E77 is active, as the cooktop shuts it down to protect the electronics. The remaining cook zones may still operate depending on how the cooktop is designed to handle the fault. You should not attempt to bypass or ignore the error, since the heat sink sensor exists to prevent component damage and potential safety hazards from uncontrolled overheating.

Repair costs vary depending on parts pricing and local labor rates. The generator circuit board for the center zone is typically the required replacement part, and induction module boards can range from around $80 to $250 or more depending on the specific model. Adding professional labor, total repair costs commonly fall in the range of $150 to $400. Getting a diagnostic estimate from a certified technician before committing to the repair is advisable.

Replacing the generator circuit board on an induction cooktop involves working near high-voltage components and requires disassembling the unit. If you are comfortable working with appliance electronics and can safely disconnect power before beginning, a knowledgeable DIYer can perform the board replacement. However, most homeowners should have a qualified appliance technician handle this repair to avoid the risk of electric shock or further damage to the cooktop.

Resetting the cooktop by cycling power at the breaker may temporarily clear the error display, but E77 will return as soon as the control system detects the broken sensor circuit again. Because the fault is caused by a physical failure in the sensor circuit or generator board, a power reset does not resolve the underlying problem. A proper repair requires replacing the defective component.