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506468-01 Issue 1004 Page 24
Table 12
Miswired Module Troubleshooting
Thermostat Demand Wiring
The diagnostic module requires a thermostat demand
signal to operate properly. The thermostat demand signal
input, labeled Y on the module, should always be con-
nected to the compressor contactor coil so that when the
coil is energized, the demand signal input is 24VAC.
When the coil is not energized, the demand signal input
should be less than 0.5VAC.
Miswired Module Codes
Depending on the system configuration, some ALERT
flash codes may not be active. The presence of safety
switches affects how the system alerts are displayed by
the module.
Miswiring the diagnostic module will cause false LED
codes. Table 12 describes LED operation when the
module is miswired and what troubleshooting action is
required to correct the problem.
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