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MICroteCh III unIt Controller
I/O expansion module faults and fan operating modes
Table 13: I/O expansion module LED & fault outputs
Description Type Yellow Green Red
Baseboard Communication Fail Fault Flash OFF Flash
Compressor #2 High Pressure (HP2) Fault OFF OFF Flash
Compressor #2 Low Pressure (LP2) Fault OFF OFF ON
Compressor #2 Low Suction Temp (LT2) Sensor Fail Fault Flash Flash ON
Compressor #2 Low Suction Temp (LT2) Fault Flash OFF OFF
Entering Water Temp Sensor Fail (with Boilerless Electric Heat and Waterside Economizer) Fault ON OFF Flash
Low Entering Water Temperature (No Display with Boilerless Electric Heat) Fault OFF ON Flash
Fan is OFF Mode OFF ON OFF
Fan is ON Mode OFF Flash OFF
Note: Mode / Faults are listed in order of priority.
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