SF 25 - Device Security Code storage failure

What does SF 25 mean?

A Storage Failure (SF) error, specifically SF 25, indicates that the slave thermostat's stored Device Security Code has been corrupted or lost. The system will default to a value of 0. This code protects device settings from unauthorized changes.

• Corruption of stored device security code data in the slave thermostat's memory.
• Power fluctuations or system reset causing data loss.
• Internal hardware fault affecting non-volatile memory.

Click steps to track your progress.

1. 1

   Establish communications with the slave thermostat using the PC Command Center software.

2. 2

   Initiate a Device Inquiry for the slave thermostat to verify its current settings.

3. 3

   Perform the 'Modify Device Information' command and navigate to the Device Security Code setting.

4. 4

   Re-enter the correct security code for the device.

5. 5

   Press F1 to 'Perform Update' and wait for acknowledgement to save the new setting.

6. 6

   Exit the configuration menu and program, then verify the security code is correctly stored.