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506920−01 09/12
Page 58
Bold text indicates a button, or text display on the thermostat.
Table 6. Troubleshooting Tips
No. Corrective Action / CommentsPossible CauseIssue / Problem
18 During the cooling mode the dis-
played air volume on the indoor con-
trol is substantially lower than ex-
pected.
The system may be following the
cooling ramping" profile or may
be in the dehumidification
mode".
− During the default cooling ramping profile the blower will run for 7.5
minutes at 82% of the cooling air volume. If the cooling ramping
profile" is selected, the system will ramp to 100% after 7.5 minutes.
− The dehumidification mode will run the system at 70% of the cooling
air volume which will be in addition to the air volume reduction pro-
vided during the ramping profile. During the dehumidification mode, a
d" will be displayed on the furnace or air handler control.
19 The Indoor unit is not providing the
expected air volume according to the
cfm shown on the indoor unit control.
− Indoor unit air volume settings
in the icomfort thermostat are
not correct.
− System is operating in the cool-
ing mode and following the
cooling ramping profile or dehu-
midification air volume.
− In the installer program select the equipment button and choose the
furnace or air handler from the system devices list and press edit.
Verify/set the correct air volume for heating and cooling modes.
− If in the cooling mode check for cooling ramp mode or dehumidifica-
tion mode as in #18.
20 − No second stage cooling is pro-
vided on a icomfort outdoor unit.
− Space temperature is above second
stage differential and has run in first
stage a long time.
− No red Critical Alert icon or alert is
displayed in the homeowner alert
button.
The red Critical Alert icon and
homeowner alert button do not
display non−critical alerts.
− Go to the installer program alert button to view all alerts and details
about those alerts.
− Look for alert code 401 (Compressor Long On Cycle) which indicates
compressor ran more than 18 hours continuous and will lock out 2nd
stage compressor.
− Cycle indoor power off and back on, alert code 401 will clear within a
few minutes.
21 No weather being displayed. icomfort Wi-Fit not communicat-
ing with router.
Make sure Wi−Fi is enabled (see Page 24).
22 Unable to complete Wi−Fi router / in-
ternet connection
Refer to 507037−01 Wi−Fi Troubleshooting checklist for icomfort Wi−Fit thermostat.