Troubleshooting, continued
88
If the No Contact message appears only when a specific field decoder or pump decoder is
active, the fault is in this decoder.
Problem The Field Transmitter reads Try Again.
Solution This message can appear if the controller is very busy, for example, if an irrigation Schedule is
running or about to start. If the message appears frequently, please see The Field Transmitter
reads No Contact on page 87.
Problem The Field Transmitter reads Unknown Decoder to an existing field decoder.
Solution The fault is probably in the character string installed in the Field Transmitter. If this is not
identical with the character string installed in the controller, the field decoder’s letters will be
switched around. Check and correct the Field Transmitter’s installation. Please see the Field
Transmitter User Manual on page 43.
Problem The Field Transmitter uses the wrong language.
Solution Select the correct language in the Field Transmitter’s installation menu. Please see the Field
Transmitter User Manual on page 43.
Troubleshooting the Controller’s Internal Parts
The MDC2 Controller does have a thermal fuse that resets itself after a Short Circuit message disappears. You
should not try to replace the thermal fuse. In general it is better to substitute the controller as a whole than try
to replace various internal parts that may be interconnected with cables and plugs. However, there are a few
procedures you may try to troubleshoot the controller.
Problem The display will not come on when the controller receives power.
Solution Check that the cable connector from the transformer to the main board is correctly inserted in
the connector on the board. Check also the cable/connector from the ON/OFF switch.
Problem The contrast on the display screen is too high/low.
Solution If the contrast is too high/low, try adjusting the potentiometer in the uppermost left corner of
the main board. To get access, remove the display and control module. Please see Replacing
the Battery on page 15.
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