Install Instructions

29
Description
COMMUNICATION ERROR
Communication between the display module and the HVAC Interface Module is interrupted. This
error clears automatically once communication is re-established.
This error can occur if the power supply voltage to the HVAC Interface Module is low. Check the
voltage with a volt meter and that the transformer VA rating is enough to power all the equipment.
MEMORY ERROR
The thermostat memory settings are corrupted. To clear, load the factory defaults in the Toolbox
menu. The thermostat will not operate any heating or cooling equipment while this error message
is present.
INTERNAL ROOM SENSOR FAULT
Due to an open or short circuit, the thermostat is unable to read the internal room temperature
sensor. If sensor 1, 2 or 3 is set to room the thermostat continues to operate, otherwise operation
stops.
The error cannot be field repaired. Contact your tekmar sales representative for warranty or repair
procedures.
INTERNAL HUMIDITY SENSOR FAULT
Due to an open or short circuit, the thermostat is unable to read the internal humidity sensor. The
thermostat stops controlling the humidifier or dehumidifier unless an external humidity sensor is
installed on Sensor 3.
The error cannot be field repaired. Contact your tekmar sales representative for warranty or repair
procedures.
SENSOR 1 FAULT
Due to an open or short circuit, the thermostat is unable to read the sensor wired to S1 and Com.
The thermostat stops normal operation if sensor 1 is the only active room or floor sensor or if a floor
maximum temperature has been set.
Check the auxiliary sensor wire for short circuits according to the sensor installation manual. It may
be necessary to replace the auxiliary sensor. Once the error has been corrected, the error message
automatically clears.
SENSOR 2 FAULT
Due to an open or short circuit, the thermostat is unable to read the sensor wired to S2 and Com.
The thermostat stops normal operation if sensor 2 is the only active room or floor sensor or if a floor
maximum temperature has been set.
Check the auxiliary sensor wire for short circuits according to the sensor installation manual. It may
be necessary to replace the auxiliary sensor. Once the error has been corrected, the error message
automatically clears.
SENSOR 3 FAULT
Due to an open or short circuit, the thermostat is unable to read the sensor wired to S3 and Com.
The thermostat stops normal operation if sensor 3 is the only active room sensor or if a floor
maximum temperature has been set.
Check the auxiliary sensor wire for short circuits according to the sensor installation manual. It may
be necessary to replace the auxiliary sensor. Once the error has been corrected, the error message
automatically clears.
Error Messages