Enter Diag Mode Spd

You might need a short, clear string for a menu:

Enter diag mode SPD? [YES] [NO]

Or a status message:

SPD diag mode active. Checking surge counters... enter diag mode spd

Because "SPD" is a generic term across brands, there is no universal key sequence. However, 90% of SPD-based monitors and controllers use one of the following three methods. Try them in order. You might need a short, clear string for a menu:

For headless SPD units (no screen, just a control board): Or a status message: