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REMOTE SENSOR TROUBLESHOOTING GUIDEREMOTE SENSOR TROUBLESHOOTING GUIDE
REMOTE SENSOR TROUBLESHOOTING GUIDEREMOTE SENSOR TROUBLESHOOTING GUIDE
REMOTE SENSOR TROUBLESHOOTING GUIDE
Comfort-Set IIComfort-Set II
Comfort-Set IIComfort-Set II
Comfort-Set II
Single Stage ModelsSingle Stage Models
Single Stage ModelsSingle Stage Models
Single Stage Models: Verify jumper wire
W-22W-22
W-22W-22
W-22 on the back
of the thermostat (not the subbase) has been clipped.
Multi-stage and Heat Pump ModelsMulti-stage and Heat Pump Models
Multi-stage and Heat Pump ModelsMulti-stage and Heat Pump Models
Multi-stage and Heat Pump Models: Verify jumper wire
W-18W-18
W-18W-18
W-18 on the back of the thermostat (not the subbase) has
been clipped.
Comfort-Set III/Comfort-Set 90/90 SeriesComfort-Set III/Comfort-Set 90/90 Series
Comfort-Set III/Comfort-Set 90/90 SeriesComfort-Set III/Comfort-Set 90/90 Series
Comfort-Set III/Comfort-Set 90/90 Series
Single Stage ModelsSingle Stage Models
Single Stage ModelsSingle Stage Models
Single Stage Models: Verify jumper wire
W-922W-922
W-922W-922
W-922 on the
back of the thermostat (not the subbase) has been clipped.
You must also enable the remote sensor option in the
Installation Instructions, Configuration Menu.
Multi-stage and Heat Pump ModelsMulti-stage and Heat Pump Models
Multi-stage and Heat Pump ModelsMulti-stage and Heat Pump Models
Multi-stage and Heat Pump Models: When installing a
remote sensor you must enable the remote sensor option in
the Installation Instructions, Installer Menu.
Troubleshooting ChartTroubleshooting Chart
Troubleshooting ChartTroubleshooting Chart
Troubleshooting Chart
To function correctly and read temperature accurately, the thermostat (when set up for a remote as outlined above) must
have constant 24-volt power. If the thermostat temperature is steadily dropping, reading low, or reads
08°08°
08°08°
08° when a remote
sensor is installed, it can be traced to one of the three following conditions.
ConditionCondition
ConditionCondition
Condition
TestTest
TestTest
Test
CommentsComments
CommentsComments
Comments
1. Loss of 24-volt power. On models with batteries, remove the batteries and re-install For the sensor to read correctly,
thermostat. If the display is blank, check heating and cooling the 24-volt system power
mustmust
mustmust
must
system to determine why 24-volt power is absent. be present. Some systems may
require an isolation relay to pro-
vide constant power to the
thermostat. Limit or safety
devices in the equipment can
also cause a power interruption.
2. A broken wire on S1, Disconnect sensor wires at thermostat. Attach a short piece Repair or replace the 3 wire
S2 and S3 or (+, SA, -) (2') of three-wire shielded cable to S1, S2 and S3 or (+, SA, shielded cable. Be sure the
from the thermostat to -) on the subbase. Bring the remote sensor to the thermostat remote wire run is not parallel
the remote. location and attach S1, S2 and S3 or (+, S, -) respectively. to line voltage wires that carry
Reattach thermostat. If the temperature begins to climb heavy inductive loads, or across
(slowly), it is reading correctly. If it reads correctly with the 2' fluorescent light ballasts that
length but improperly when attached to the wire run, it may cause an inductance to be
indicates a fault in the wire run. transmitted to the thermostat.
3. A shorted or Because it is an electronic sensor, there are no Ohm values Replace remote sensor.
damaged remote sensor. to test. If correct conditions as listed in 1 & 2 above and the
temperature stays at or near
08°08°
08°08°
08°, it indicates a shorted or
damaged remote sensor.
NoteNote
NoteNote
Note: Digital thermostats and remote sensors acclimate very slowly to temperature change. It may take an hour or more for
the temperature to acclimate to the room temperature from a low temperature reading as outlined above. To expedite the
room temperature display use the reset instructions listed in the installation instructions for the thermostat model you are
working with. When reset, the thermostat will default to a room temperature of 70° and begin sensing room temperature. Be
sure to reconfigure the installer menu for a remote sensor because the reset function may cancel remote sensing.