icomfort Touch 7−Day Programmable Communicating Thermostat
Page 31
Critical alerts are displayed on Home (user) screen, in the Homeowner alert tab, and in
the Installer alert tab. Minor and Moderate alerts are found only in the Installer alert tab.
Table 4. Alert Codes and
Troubleshooting
Alert ID Action required to Clear/RecoverPriorityMessage Name
415 (Outdoor Unit)
High Discharge Line Tempera-
ture Strikes Lockout
Critical Discharge line high temperature error count reached 5 strikes. Check sys-
tem charge using approach and subcooling temperatures. Reset by putt-
ing outdoor board in test mode or resetting low voltage power.
416 (Outdoor Unit)
Outdoor Coil Sensor Faulty
Critical Sensor being detected open or shorted, or temperature is out of sensor
range. Outdoor unit control will not perform demand or time/temperature
defrost operation. (System will still heat or cool.) Clears when outdoor unit
control detects proper sensor readings.
417 (Outdoor Unit)
Discharge Sensor Faulty
Critical Outdoor unit control detects open or shorted sensor, or temperature that is
out of sensor range. Critical Alert after 10 minutes. Reset by replacing
sensor. This fault is detected by allowing the unit to run for 90 seconds
before checking sensor resistance. If the sensor resistance is not within
range after 90 seconds, the board will count one fault. After 5 faults, the
board will lock out. Check for proper sensor reading and attachment to
line. Replace if out−of−spec.
420 (Outdoor Unit)
Defrost Out of Control
Critical Defrost cycle lasts longer than 20 minutes. Check heat pump operation.
Cleared when W1 signal is removed. Applicable only in communicating
mode with non−communicating heat pump.
700 (Stat) Comfort Sensor
Temperature Sensor Problem
Moder-
ate
Recalibrate thermostat to clear. Replace thermostat if needed.
701 (Stat) Comfort Sensor
Temperature Too High
Moder-
ate
Recalibrate thermostat to clear; cool thermostat;adjust set point. Replace
thermostat, if needed.
702 (Stat) Comfort Sensor
Temperature Too Low
Moder-
ate
Recalibrate thermostat to clear; warm thermostat;adjust set point. Replace
thermostat, if needed.
703 (Stat) Comfort Sensor
Humidity Sensor Problem
Moder-
ate
Recalibrate thermostat to clear; adjust set point. Replace thermostat, if
needed.
704 (Stat) Comfort Sensor Humidity
Too High
Moder-
ate
Recalibrate thermostat to clear. Replace thermostat, if needed.
705 (Stat) Comfort Sensor Humidity
Too Low
Moder-
ate
Recalibrate thermostat to clear. Replace thermostat, if needed.
OHM
CHECK
Ohm reading between i+ and i− anywhere on the RSBus with supply power off should be between 70 and 90 ohms. If
above 90 ohms, check and repair wiring, splices or other wiring defects that may be causing the excessive resistance.
Table 5. Troubleshooting Tips
Bold text indicates a tab, button, or text display on the thermostat.
No. Issue / Problem Possible Cause Corrective Action / Comments
1 − No electric heat operation.
− The thermostat system setting
does not offer a emerg. heat
choice on an HP system.
− The thermostat does not offer
any "heat" choice on an AC
system with air handler with
electric heat.
Electric heat was not
manually configured con-
figured at the Air Handler
Control (AHC) before the
icomfort Touch system
discovery process at initial
power−up.
− Manually configure to discover the electric heat sec-
tion(s) on the air handling (see Page 36 or CBX32MV or
CBX40UHV manual for details).
− Re−setup the icomfort system by selecting the setup tab
in the Installer program and press start to begin system
discovery; then reconfigure the system.
2 Thermostat Displays System
Waiting message and the fur-
nace does respond to a heating
demand (no red critical alert
icon or alert messages are dis-
played on the thermostat).
The furnace is in "watch-
guard" mode (moderate
alert) and will not display
the red critical alert icon
nor be displayed in the
homeowner alert tab.
− Go to the installer program alert tab to view all alerts and
details about those alerts.
− If the furnace is in "watchguard" mode, the furnace can
be reset from the Home screen by setting the thermostat
system settings to off for 20 sec, then back to heat.
Then initiate a new heat demand.
3 Outdoor temperature is not dis-
played on the thermostat.
Outdoor Temp Display
must be manually enabled
to display the outdoor tem-
perature on the home
screen.
− On the home screen, press press for more and then
press the HELP tab. Press the user preferences button,
then use arrows to scroll down to Outdoor Temp Dis-
play. Press modify button and use select to select On
and then press the save button.
− If Outdoor Temp Display is not shown in the user pref-
erences menu, the system does not have an outdoor
sensor and one must be added.
table continued on next page
To Next Page
Loading...
