The manual states that if you are using a single balanced zone (EOL resistors), the resistor must be placed inside the sensor housing across the NC and COM terminals, not at the panel.
Usually rodents or HVAC drafts. Manual Solution: safeguard sd 103 manual
The safe requires both the combination dial and the key to be used in sequence. The manual states that if you are using
: Insert the key, turn it clockwise, and pull the handle. Electronic Digital Instructions (ESD Series) turn it clockwise
Turn the dial Left (Counter-Clockwise). Pass the first number 3 times and stop on it exactly on the 4th time.