Faults - symptoms and solutions
When power is applied to the unit no lights or displays are lit.
Check the power supply.
Check that the terminal plug on the reverse of the pcb is wired properly.
Check that the terminal plug is pushed securely into the socket.
Fault light is illuminated and the BX444 is in alarm.
Has the correct number of sensors been selected on the p.c.b. See configuring the operation of the BX444.
Is the green Light illuminated on the sensor?
Check sensor connections.
Is the connector plug in the sensor secure?
Check that there is no interruption to the cable supply to the sensor.
The alarm function isn’t latching. When gas levels indicated drop below the main alarm threshold the main
relay resets.
Check the position of the alarm function Switch. There are two modes. i) Auto reset ii) Latch with manual Reset.
When you have selected the correct memory function you must press the reset button so that this change takes
effect. The main alarm relay changes over the volt-free relay and then with the Main Alarm light still on the relay re-
energises.
Check the position of the Jumper link JP1. This is located between the two terminal plugs. When in the ‘C’ position
the relay will stay on, either until the level of detected gas drops if set for auto reset or until the level of gas drops
and the BX444 is manually reset. If the jumper is set to ‘I’position the relay will de-energise momentarily then
automatically return to the on position. This function is used when the detector is connected to a manual reset valve
which only needs a trigger pulse to close it. This also extends battery backup time as solenoid valves do not need to
be constantly powered. Check local regulations recommendations regarding manual reset gas valves and their
control.
