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49-5000637 Rev. 0
Troubleshooting
The thermostat is not controlling the HVAC unit.
Check if the HVAC unit is set to “External Thermostat”
(Class 2) mode. Refer to Zoneline Owner’s Manual, Aux
settings.
Verify the status of the red light on the Wireless Control
Card.
• The red light is off
The Wireless Control Card is not powered. Verify that
the Wireless Control Card is properly wired to the HVAC
unit-specifically make sure that the RED and the BLACK
wire are properly connected.
• If the red light is blinking with one (1) flash.
The Wireless Control Card is powered but it is not
communicating with the thermostat, turn the thermostat
off and on to re-initiate the linking procedure.
In case of a Network Installation, re-link the thermostat
and the Wireless Control Card with the Network
Programmer.
• The red light is blinking with three (3) flashes.
The Wireless Control Card is communicating with the
thermostat. Verify that the Wireless Control Card is
properly wired to the HVAC unit and that equipment
settings on a thermostat - compressor type, electric heat
and reversing valve - are properly configured.