mypros+
Error code reference

Samsung Range Error Code CF-1

Communication between the Main and Sub PCB is interrupted.

Samsung codesSamsung range codes

Communication between the Main and Sub PCB is interrupted.

First step from the service manual

Check whether connector of main PCB has been inserted. Check whether connector of sub PCB has been inserted. If no issue with connector on Main and Sub PCBs has been detected, replace Main PCB.

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 CF-1.

  • 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 CF-1 means on a Samsung range

The CF-1 error code on a Samsung range indicates a communication failure between the main PCB (printed circuit board) and the sub PCB. These two boards work in tandem to manage range functions, with the main PCB handling primary control operations and the sub PCB managing secondary functions such as display output, keypad input, or burner control depending on the model. When the internal communication signal between these boards is interrupted or lost entirely, the control system flags CF-1 to alert the user and technician that coordinated operation between the boards has broken down.

The most common root cause is a loose, unseated, or damaged connector on either the main PCB or the sub PCB. The wiring harness that bridges these two boards can work itself loose over time due to vibration from normal cooking use, or it may have been disturbed during a previous service or installation. In some cases, the connector itself may be physically intact but have a pin that has backed out of its housing, preventing a reliable electrical connection.

If connector inspection confirms that both connectors are fully and properly seated with no visible damage to pins or harness wiring, the diagnostic process points to a failed main PCB as the likely culprit. A faulty main PCB that can no longer transmit or receive communication signals correctly will generate this error even when all physical connections are sound. In that scenario, replacing the main PCB is the recommended corrective action.

Source: manufacturer service documentation.

Common causes of CF-1

  1. 01

    Loose or unseated main PCB connector

    Wiring / connection

    The wiring harness connector at the main PCB may have worked loose due to vibration or a prior service visit. Visually inspecting and firmly reseating the connector is the first step in diagnosis.

  2. 02

    Loose or unseated sub PCB connector

    Wiring / connection

    The connector on the sub PCB side of the communication harness may also be partially disconnected. Both ends of the harness must be checked and confirmed fully seated.

  3. 03

    Damaged wiring harness between boards

    Part replacement

    The wiring harness linking the main and sub PCBs may have a damaged, pinched, or broken wire even if the connectors appear seated. Inspecting the full length of the harness for visible damage can identify this issue.

  4. 04

    Backed-out or bent connector pin

    Part replacement

    A pin inside the connector housing may have backed out of position or been bent during installation, preventing reliable contact even when the connector body appears locked in place.

  5. 05

    Failed main PCB

    Part replacement

    If all connectors and wiring check out as intact and properly seated, the main PCB itself may have failed and lost the ability to communicate with the sub PCB. Replacing the main PCB is the prescribed next step in this scenario.

See the test procedure for each cause

Frequently asked questions about CF-1

What does CF-1 mean on a Samsung range?
CF-1 indicates that communication between the main PCB and the sub PCB inside your Samsung range has been interrupted. These two control boards must exchange signals continuously to operate the range correctly. When that communication link is lost, the range displays CF-1 and typically stops functioning until the issue is resolved.
Can I fix the CF-1 error myself?
A homeowner with basic mechanical comfort can check whether the wiring connectors on both control boards are fully seated, which is the first and most common fix. However, accessing the PCBs requires opening the range cabinet, so you should unplug the range from power before proceeding. If reseating the connectors does not clear the error, resolving the issue will likely require a technician to replace the main PCB.
Is it safe to use my Samsung range while CF-1 is displayed?
A CF-1 error means the control system has detected a failure in internal board communication, so the range may not respond to inputs correctly or at all. Using the range in this state is not recommended, as control functions may be unreliable. The range should remain unplugged until the communication fault is diagnosed and repaired.
Will resetting my Samsung range clear the CF-1 error?
Unplugging the range for a few minutes and restoring power may temporarily clear the error display, but if the underlying connector or board issue still exists, CF-1 will return. A reset does not repair a loose connector or a failed PCB. The error will persist until the physical cause is corrected.
How much does it cost to repair a Samsung range CF-1 error?
If the fix is simply reseating a loose connector, costs are limited to a service call fee, which typically ranges from around $75 to $150 depending on your area. If the main PCB needs to be replaced, the total repair cost including parts and labor generally falls in the range of $200 to $450. Getting a diagnostic estimate before authorizing parts replacement is advisable.

Related Samsung range codes

All Samsung range codes
View all 72 Samsung range codes

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

Get Started

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