Potentiometer/Alarm Relay Issues

Problem: There is no 3.3V output for to power the potentiometer(s).

Solution: There is a PPTC fuse F1 on the 3.3V line. Disconnect the potentiometers and using a DVM, check the resistance on the terminal between the 12V output and common ground (COM). The reading should indicate an open circuit.

• If not, the line is damaged.

Problem: The Alarm Relay doesn’t operate.

Solution: Check fuse F4. 

• By default, alarm relay contacts “NO-COM” should be closed.