Chapter 7: Service and troubleshooting
EST3X Technical Reference Manual 211
Possible cause
An internal trouble is detected on the
loop
• A detector is defective or dirty
• A CO module is defective or not seated correctly
• A photo or heat sensor is reading too high or too low
• A light source is affecting a detector
• There is a short between a detector and detector
base
• An isolator or relay base is defective
• Devices are drawing too much or too little current
during mapping
A maintenance alert is detected on
the loop
A detector is nearing end of life
he system reports an “End of life
event
A CO module needs replacement
Mapping errors
Table 62 lists basic mapping errors. For detailed information on identifying and
locating mapping errors, refer to “Using the SDU Signature Series diagnostics
tool” on page 213.
Notes
• Do not replace factory-programmed devices such as pull stations and MM1
modules with a SIGA-CT1.
• For mapping purposes, give all manual pull stations the device type Pull,
regardless of their model numbers.
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