Troubleshooting
1. If the device has the option to go serial, it must be in serial mode.
2. If using Dip-Switch devices, verify that you do not have any 2 zones set for the same address.
Note: if a 4208u is operating in dip-switch mode, and has only some of its zones in use, you may not use
other dip-switch RPMs to overlap the unused zones. You may overlap these with wireless zones.
3. While in programming, the voltage on the polling loop should be 10.5VDC steady. When a device is
tripped you will see the voltage quickly fluctuate. If voltage is fluctuating while in programming and
nothing is being tripped, there is likely a device on the polling loop broadcasting constant garbage.
Isolate different branches of the polling loop to isolate the problematic device. A device that is
broadcasting garbage on the loop will eliminate global polling causing slow zone response and random
troubles.
4. Verify that no RPMs are connected to the polling loops, which are not programmed into the panel.
This may be difficult to verify, but if a device is talking on the polling loop and the panel is not
programmed to listen to it troubles and slow response will result.
5. When using smoke detectors with maintenance features, the smoke detector may be sending continuous
high sense/high sense restore messages to the control. This continuous broadcasting can cause problems on
these zones as well as other polling loop zones. See the section on
Maintenance for more information.
6. In zone programming, the “V-plex relay” option must only be enabled for 4101SN modules and not other
devices.
7. In zone programming, the “Access point number” option must only be enabled for Vista-key DSM Backup
zones.
Continuous Check on zones
1. Disable tamper either by dip switch on the RPM or by setting *24 = 1 (or both). This may be re-enabled
later after the trouble has been isolated.
Note: Tamper is usually disabled by turning a switch ON, not off.
2. If using dip-switch RPMs, check all the dip-switches. Make sure that they are not backwards, that the
correct chart was used, and that all dips are set correctly, including dip switch 1 and 2.
3. Zones set for zone type 05, 09, 16, 17, 18 may be in “Check” because of a zone fault (open). For any other
zone types, proceed to the next step.
a. Verify the zones are correctly wired and on the correct terminals.
b. Check voltage on the zone terminals. This should be approximately 5-6 volts DC on any panel
zone, or expansion zone (except zones that can use 2-wire smokes) when the sensor loop and end-
of-line-resistor are normal.
c. Note: a “right loop” zone will be 0VDC when normal because it does not use an end-of-line
resistor. If you do not see correct voltage on the zone terminals, the zone loop is not correct. Also,
try setting as a burg zone type to isolate this.
d. Temporarily programming as a non-24 hour zone type will help you isolate it even further.
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