Pyromation Series 423 - Manual (Page 10)

9-1 TROUBLE SHOOTING
Page 9
Destructive Errors
Do not connect power to the sensor input. This could destroy
the panel meter.
Do not connect power to the sensor itself.
Incorrect line power on the unit; check options.
Non-Destructive Errors
Reversing the polarity on line power input.
Reversing the polarity on sensor input.
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' OPEN '
' OVER '
' UNDR '
Erratic Readings
POSSIBLE WIRING ERRORS
PROBLEM
Sensor not connected
Damaged sensor
Sensor is over temperature range
Incorrect sensor
Sensor is under temperature range
Incorrect sensor
Wrong polarity on connection
Loose connection on sensor input
Damaged sensor
AC noise on sensor connections
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POSSIBLE CAUSES