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Q.1.61 January 2023
Page 6
KE2 EvapOEM
Alarm Troubleshooting Guide
Troubleshooting Tables
Alarm & Alarm Name
Basic
Combo
Web-
Display
Display
pages
SSA
SUCTION
T1 Suct
TEMP
Sensor
SSA
SENSOR
Alarm
ASA
AIR TEMP
Air
SENSOR
Sensor
ASA
Alarm
CSA
COIL TEMP
T3 Coil
SENSOR
Sensor
CSA
Alarm
A1A
AUX1
AUX1
SENSOR
Sensor
A1A
Alarm
A2A
AUX2
AUX2
SENSOR
Sensor
A2A
Alarm
A3A
AUX3
AUX3
SENSOR
Sensor
A3A
Alarm
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Description
Variables & Setpoints Corrective Action
Variables
ONLY ACTIVE WHEN
AN ELECTRONIC
SUt - T1 Suction Temp
EXPANSION VALVE IS
rtP - Room (Air) Temp
SELECTED.
CLt - Coil Temp
AU1 - Aux Temp 1
Red LED is illumi-
AU2 - Aux Temp 2
nated. System cannot
AU3 - Aux Temp 3
operate while this
alarm is present.
• If temp sensor reads
-88 the cable or sensor
Temperature sensor is
is open, or not con-
shorted or open (not
nected.
connected).
• If temp sensor reads
180+ the input, cable,
Yellow LED is illumi-
or sensor is shorted.
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Temperature sensor is
shorted or open (not
connected).
• The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaffed or otherwise damaged sensor cable. Inspect the length of the cable for any
cut, burned, chaffed or otherwise damaged sections. Repair any damaged sections
• Check that the sensor is inserted into the proper position on the board. The sensor
is not polarized; black and white wires can be inserted in either position on the
connector:
Suction Temp: black connector labeled TSUC.
Air Temp: blue connector labeled TAIR.
Coil Temp: yellow connector labeled TCOIL.
2nd Coil Temp/Aux 1 Temp: green connector labeled AUX1.
Aux 2 Temp: black connector labeled AUX2.
Aux 3 Temp: black connector labeled AUX3.
• The bare stranded wire of the temperature sensor should be inserted so that the wire
is directly touching the gate of the connector. If the gate is contacting the insulation
of the wire, it will not allow the controller to read the sensor.
• If wires have been extended, check for any bad splices, crimps or solder joints where
extended.
• Check the sensor probe. If the sensor cable has been pulled, the sensor probe may
have been damaged, and needs to be replaced.
• To verify accuracy of the sensor, the preferred method is to place the sensor in a
proper ice bath while connected to the controller. View the relevant sensor in the
variables menu, temperature should read around 32.0°F. If adjustment is necessary,
an offset can be applied via the browser interface.
• Sensor accuracy can also be verified using a third party thermometer, however, it
must be calibrated and rated to measure low temperatures.
• Unplug the connector and check that the resistance reading of the sensor matches
the temperature vs. resistance table.
Temperature °F
-22
-4
14
32
50
68
77
86
104
122
• If temperature appears to be within the proper operating range, swap a non-alarming
sensor with the sensor being diagnosed.
• If the new sensor is read properly by the controller, the sensor being diagnosed will
need to be replaced.
• If the sensor was disconnected for diagnostic purposes, return the sensor to the
appropriate location on the controller once diagnostics are complete.
Ohms
19480
12110
7763
5114
3454
2387
2000
1684
1231
885
21214V3.0
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