68-0139
46
W180 ZONE CONTROL SYSTEM
Appendix A: Troubleshooting
TABLE 11—W180A CONTROLLER.
Problem
Solution
No functions
work.
1. Verify power is properly connected.
2. Verify the dc power connections and polarity.
3. Observe the LED on the motherboard. During normal operation, the LED flashes once per second.
a. If the LED does not flash, check the power connections.
b. If the LED flashes two times per second, no application has been loaded.
4. Verify all cable connections between the W180A Controller chassis and the wire termination
board.
5. Verify that all relay cards are seated properly.
6. Verify that the relay cards are installed with the components facing to the right.
TABLE 12—S321A TOUCHPAD.
TABLE 13—HIGH LIMIT CONTROLLER.
Problem
Solution
Heating
equipment not
operational.
1. Verify the limit controller setpoint does not interface with normal return air temperatures.
2. Make sure the device is mounted in an area of the return air that is not subject to temperature
extremes (for example, attics, garages, and unconditioned crawl spaces).
Problem
Solution
No display.
1. Verify there is 12 Vdc between the red and black wires at the S321A Touchpad.
2. Readjust the contrast setting. See the S321A Touchpad Specification, form 63-0104, for more
information.
3. Replace the S321A Touchpad and reset the system.
Keys do not
work.
1. Verify that the W180A Controller is operating (LED is flashing once per second).
2. Verify the connection and the wiring between the S321A Touchpad and W180A Controller.
3. Replace the S321A Touchpad and reset the system.
Incorrect
displays/
screens.
1. Verify that the correct application was downloaded into the W180A Controller.
2. Interrupt power to the W180A Controller and the S321A Touchpad. Reconnect the power and wait
two to three minutes for the proper application to be displayed.
Touchpad
does not
respond to
the W180A
1. Turn off power to the W180A Controller.
2. Remove five screws to expose the W180 motherboard.
3. Turn on power to the W180A Controller and monitor the two LEDs located under the relay card
on the right side.
a.
If the LEDs do not flash, the EEPROM above the LEDs is inserted incorrectly or the W180A
is not communicating and must be replaced.
b. If the LEDs only flash together at the same time, the W180A is sending data to the Touchpad,
but the Touchpad is not sending data to the W180A. Verify that the H3 and H4 wiring is
correct.
NOTE: If the LEDs flash together most of the time, but occasionally flash out of unison, the
W180A and Touchpad are communicating correctly.
Содержание W180
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