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Error code reference

GE Range Error Code 700

Radiant board heartbeat missing

GE codesGE range codes

Radiant board heartbeat missing — heartbeat not received within specified ms.

First step from the service manual

Check harness; possible radiant control board failure.

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

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What 700 means on a GE range

Error code 700 on a GE range indicates that the main control board has lost communication with the radiant control board. Specifically, the radiant board is expected to transmit a recurring "heartbeat" signal at defined millisecond intervals to confirm it is operating normally. When the main board does not receive this heartbeat signal within the specified timeout window, it triggers the 700 fault and typically disables the surface cooking elements as a safety precaution.

The radiant control board is a dedicated sub-board that manages the power output to the smoothtop surface heating elements. It communicates with the main control board over a wiring harness that carries both power and data signals. A break, short, or corrosion in this harness can interrupt the heartbeat signal without the radiant board itself being defective. This makes harness inspection the correct first diagnostic step before condemning any board.

If the wiring harness checks out intact with no visible damage, pinched conductors, or loose connectors, the fault most likely points to a failed radiant control board. The board may have failed internally due to a power surge, heat stress, or component failure that prevents it from generating or transmitting the heartbeat signal. In some cases, the main control board itself may be failing to receive or process the signal correctly, though this is a less common cause.

Source: manufacturer service documentation.

Common causes of 700

  1. 01

    Loose or damaged wiring harness

    Wiring / connection

    The harness connecting the main control board to the radiant control board may have a loose connector, broken wire, or corroded terminal that interrupts the heartbeat signal. Inspect both ends of the harness for secure seating and visible damage.

  2. 02

    Failed radiant control board

    Part replacement

    If the harness is intact and properly connected, the radiant board itself has likely failed and is no longer generating the required heartbeat signal. This is the most common hardware failure associated with this code.

  3. 03

    Pinched or shorted harness wiring

    Part replacement

    Wiring routed near sharp metal edges or heat sources can develop a short or open circuit over time, cutting off communication between the two boards even if connectors appear seated correctly.

  4. 04

    Failed main control board

    Part replacement

    Less commonly, the main control board may be unable to receive or interpret the heartbeat signal due to an internal failure. This is typically considered after the harness and radiant board have been ruled out.

See the test procedure for each cause

Frequently asked questions about 700

What does 700 mean on a GE range?
Error code 700 means the main control board did not receive the expected heartbeat signal from the radiant control board within the required time interval. The radiant board communicates continuously with the main board to confirm it is functioning, and a missed signal triggers this fault. The range disables the surface elements when this code appears to prevent uncontrolled operation.
Can I fix error code 700 on my GE range myself?
A knowledgeable DIYer can start by inspecting the wiring harness between the radiant control board and main control board for loose connectors, visible damage, or corrosion. If the harness looks good, replacing the radiant control board is the next step, which is a moderately involved repair requiring the cooktop to be disassembled. If you are not comfortable working around electrical components, a qualified technician should handle the diagnosis and repair.
Is it safe to use my GE range when error code 700 is showing?
You should not attempt to use the surface cooking elements while error code 700 is active. The range has flagged a communication failure in the system that controls those elements, and continued use could create an unsafe condition. The oven may still function depending on how the range responds to the fault, but the safest approach is to stop using the appliance until the issue is diagnosed and repaired.
Will resetting my GE range clear error code 700?
Power cycling the range by unplugging it or shutting off the circuit breaker for several minutes may temporarily clear the display, but the code will return if the underlying fault is still present. A true fix requires identifying and correcting the cause, whether that is a harness issue or a failed radiant control board.
How much does it cost to repair error code 700 on a GE range?
Repair costs vary depending on the root cause. If only the wiring harness needs to be reseated or repaired, costs are minimal. A replacement radiant control board typically runs in the range of $80 to $200 or more for the part alone, with professional labor adding $100 to $250 depending on your area and the technician's rates. Getting a diagnostic estimate before committing to parts replacement is advisable.

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