Boiler Control Instruction & Operation Manual
Page
51
of
68
Trouble- Shooting
Sensors Status
Supply
-768 F
Shorted
Figure 22: Sensor Screen shown with Shorted Supply Sensor
The sensor status screen is selected from the
MAIN
or
HELP
menus. A failed sensor is shown with a red
background. By selecting on the individual sensors a larger display
“gauge’ with applicable limits is provided. When
a sensor fails
“opened” or “shorted” the value is changed to reverse video (background red and value black) and
shows
“024” or “768” respectively to indicate that there is a fault with the sensor.
Each Sensor is provided with the following diagnostic information:
Indication
Possible Cause
Not Installed
The sensor has not been selected. As shown in Figure 22 above, the Header sensor has
not been selected. Refer to the Parameter Adjustment section for additional information.
Open
Check sensor wiring. Sensor open will show if the sensor has not yet been wired to the
boiler or if a wire is loose.
Shorted
Check sensor wiring. Sensor terminals are connected to each other of the sensor has
failed.
Outside low range
Outside high range
Sensor input is out of range. Sensor is defective or is being subjected to electrical noise.
Not reliable
Sensor is unreliable. Sensor is defective or is being subjected to electrical noise.
