Q.1.61 January 2023
Page 11
KE2 Evap
OEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description
Variables & Setpoints Corrective Action
Basic
Display
Combo
Display
Web-
pages
dor
dor
DOOR
SWITCH
Door
Open
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Door is open and air
temp reading above
Room Temp setpoint
+ 0.5°F longer than
Door Alarm Delay.
Variables
rtP - Room (Air) Temp
AU1 - Aux Input 1 Status
AU2 - Aux Input 2 Status
AU3 - Aux Input 3 Status
Setpoints
tS - Room Temp
setpoint
dAd - Door Alarm Delay
AU1 - Aux Input 1 Mode
A1A - Aux Input 1 State
AU2 - Aux Input 2 Mode
A2A - Aux Input 2 State
AU3 - Aux Input 3 Mode
A3A - Aux Input 3 State
KE2 Combo Display Setpoints
AUX1 FUNCTION
AUX1 SWITCH STATE
AUX2 FUNCTION
AUX2 SWITCH STATE
AUX3 FUNCTION
AUX3 SWITCH STATE
DOOR SWITCH STATE
• Verify that the door is closed.
• Verify which auxiliary input is being used for the door switch (AU1, AU2 or AU3).
Press and hold
until tS appears. Press
until AU1, AU2 or AU3 appears. Press
to view what the auxiliary input is currently set to. If the auxiliary input is set
to door switch, dor will be shown on the Basic Display. Press
to return to the
advanced setpoints menu and check the other inputs. Verify the leads of the door
switch are connected to the correct auxiliary input, and that the bare stranded wire
of door switch lead is 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 door switch. Inspect the length of the cable for any cut, burned,
chaffed or otherwise damaged wire. Repair if there is damage and verify operation.
• Verify that the door switch is in proper working order. Door switches provided
by KE2 Therm are normally closed switches. To test them, move the two pieces of the
switch close together, remove the leads from the connector on the board and check
that the circuit is continuous using a multimeter. Move the two pieces of the switch
apart more than 6 inches. Check continuity again; it should be open. If the door
switch is operating in an opposite manner, the switch is a normally open switch and
the controller should be reconfigured appropriately: select the correct input, A1A,
A2A or A3A (indicating Aux In 1, 2 or 3 state) and set it to CLo for activate on closed
circuit. If the switch is verified to be inoperable, replace the switch.
• Confirm proper door switch operation by opening the door, fans should turn off
and refrigeration should stop shortly after. Close door, the controller should resume
refrigeration and fans. If there is a blinking green light on the controller, it has not
cleared the time for short cycle protection and should resume refrigeration in a few
minutes.
• Check KE2 Combo Display inputs. If a KE2 Combo Display is present, additional
inputs are available for door switches. To confirm settings, press and hold
and
at the same time for at least 3 seconds to access the KE2 Combo Display set-
points. Check AUX 1 FUNCTION, AUX 2 FUNCTION, AUX 3 FUNCTION, and DOOR
SWTCH STATE to see which input or inputs are set to DOOR SWITCH. Proceed with
the troubleshooting steps outlined above.