24
Symptom
Possible Cause
Corrective Action
Wrong mode selected
Select cooling mode
Thermostat in Unoccupied
mode
Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied cooling setpoint
Anticycle delay active
Wait, the anticycling period will end and the
equipment will start
Cooling setpoint is satisfied
Lower the cooling setpoint
Cooling lockout attained
1. Mode is locked out based on outside air
temperature
2. Change configuration parameter C Lock to value -
40 °F ( -40 °C ) to by-pass lockout
Thermostat will not call
for cooling
Wiring error
1. Start the Fan by forcing the Fan ON mode
2. Put a jumper across terminals RC & Y1. The
cooling should come ON. If it does not, verify wiring
Wrong mode selected
The thermostat will not
turn on the fan
Wiring error
1. Start the Fan by forcing the Fan ON mode
2. Put a jumper across terminals RC & G. The fan
should come ON. If it does not, verify wiring
Digital display shows
missing digits or erratic
segments
Defective display
Replace thermostat
RH sensor is out of range
Verify the remote RH sensor or the internal RH
sensor
System Mode in Cool or Off
Change the system mode parameter to heat
System Mode in Auto but a
cooling demand at the
thermostat
Wait: when a heating demand will occur at the
thermostat, humidification will resume
Thermostat will not call
for humidification
High limit sensor is controlling
the humidifier output by
forcing it to 0%
Wait: when the supply humidity will drop below the
high limit setpoint, humidification will resume.
RH sensor is out of range
Verify the remote RH sensor or the internal RH
sensor
System Mode in Heat or Off
Change the system mode parameter to cool
System Mode in Auto but a
heating demand at the
thermostat
Wait: when a cooling demand will occur at the
thermostat, dehumidification will resume
Thermostat will not call
for dehumidification
Outside air temperature is
below the Dhu OALK
parameter
Change the Dhu OALK parameter to a value that will
enable the dehumidification, if desired.
Summary of Contents for VT7607B5x28(X)
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