DSC HS2128 Reference Manual page 206

Trouble [3] Bus Voltage Trouble
Trouble
[01] HSM2HOST Bus Low Voltage
The 2-way wireless integration module has detected a
voltage less than 6.3V on its aux input.
[02] Keypad 1-16 Bus Low Voltage
Enter 02 to view hardwired keypads with a bus voltage of
less than 6.9V for ICON/LCD models that include a
wireless transceiver, 7.7V for the ICON/LCD/LED
models that do not.
[04] HSM2108 Bus Low Voltage
Enter 04 to view zone expanders with a bus voltage of
less than 5.9V.
[05] HSM2300 Bus Low Voltage
Enter 05 to view power supplies with a bus voltage of less
than 6.9V.
[06] HSM2204 Bus Low Voltage
Enter 06 to view high current output modules that have
detected a bus voltage of less than 6.9V.
[08] HSM2208 Bus Low Voltage
The low current output module has detected a voltage
less than 5.9V on its aux input.
[09] HSM2955 Bus Low Voltage
The audio module has detected a voltage less than
9.65V on its aux input.
Trouble [4] AC Failure
Trouble
[01] Zone 1-128 AC
[03] Siren 1-16 AC
[04] Repeater 1-8 AC
[05] HSM2300 1-4 AC
[06] HSM2204 1-4 AC
[07] Alarm Controller
An AC trouble has been detected on a device or module.
Section 8: Troubleshooting
Press [03] to determine specific trouble
Troubleshooting
Ensure voltage at module is higher than the documented limits.
Ensure wire run is not too long.
Check voltage of panel battery.
Trouble should clear when AC is re-applied and the battery has had time to charge.
Disconnect AC and allow the panel to run on battery power. Ensure voltage at module
is higher than the documented limits.
Press [04] to determine specific trouble
Troubleshooting
Verify voltage measured across AC terminals is 16-18VAC. Replace transformer if
required.
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