KE2 Evap
OEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 4
© 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
Blank Display
No LEDs are
illuminated on the
display.
N/A
Note: While not an alarm condition, the controller may or may not be operational if
nothing is shown on the Basic Display. The KE2 Evap OEM can continue to operate the
system even while the Basic Display is disconnected.
If controller is still powered and system is running troubleshoot the Basic Display:
• Make sure the plugs are fully inserted into the jacks at both the KE2 Evap OEM and the
Basic Display.
• Check the connection between the KE2 Evap OEM board and the Basic Display for any
burned, chaffed, cut or otherwise damaged sections. If damaged, replace cable.
• There are two jacks on the Basic Display. Switch the jack used on the Basic Display and
check for functionality.
• Check to see if Basic Display cable is longer than 5ft. Maximum cable length between
Basic Display and KE2 Evap OEM board is 5ft.
If system is not running and there are no LEDs lit on the KE2 Evap OEM board,
check:
• Incoming voltage to the board. Voltage should be between 100VAC – 240VAC, if not
address supply voltage issue.
• Remove power to controller and check fuse located on board. The fuse cannot be
checked visually; remove fuse from board and check resistance across the fuse. An
open reading indicates the fuse has blown and points to a supply voltage issue or short
on the board or connected devices. The fuse will blow in order to protect the controller
from permanent damage. Check for proper incoming power, examine all cables for
burned, cut, chaffed or otherwise damaged insulation/wire and repair. Replace fuse
(PN 21375).
• Remove all connections to controller except for power and the Basic Display; see if the
Basic Display illuminates.
Note: Power injected into the controller’s Ethernet port may result in the display going
blank and other unexpected problems.
Power over Ethernet (POE) switches connected to the KE2 Evap OEM should have the
power output feature disabled.
Ed
Ed
ELECTRIC
DEFROST /
TEV
Intro
“Ed” is blinking on the
Basic Display, yellow
and red LEDs are
flashing.
N/A
Not an alarm condition, controller is in introduction mode. Please refer to Q.1.45 for
controller setup.
PrF
PrF
N/A
N/A
Process Failure. Basic
Display is not com-
municating to the
controller.
N/A
The Basic Display is not properly communicating with the KE2 Evap OEM board. The KE2
Evap OEM can continue to refrigerate without the Basic Display, but setpoints can only
be changed via the browser interface.
• Check that cable is inserted into the correct location on the board.
• Check that cable between board and display is firmly inserted at both ends.
• Check that cable is not cut, burned, chaffed, disconnected or otherwise damaged.
• Cable should not be extended over 5ft.
• Confirm LEDs on KE2 Evap OEM board. The LEDs are located between the Ethernet
and display ports.
If PWR & BOOT are solid green, board is operating normally. There may be an issue
with the display, cable, or display port on the controller.
If RST is solid red, there is a hardware malfunction. Remove all connections to the
controller except for incoming power. If RST is still solid red, replace controller.
If BOOT & RST is blinking alternately, controller has been put in bootloader mode
to receive an update. If the update process has already started beyond putting the
controller in bootloader mode, complete the update to return to normal operation.
Otherwise, the controller will exit bootloader mode after 10 minutes.
NO NC
COM
TSuc (Suction Temp)
Aux3
Aux2
Aux1 (2nd Coil Temp)
TCoil (Coil Temp)
TAir (Return Air Temp)
0 to 10VDC Output
Alarm Relay**
Door Alarm Relay**
Variable Speed Fan
Ethernet
Display
Defrost Relay
Liquid Line Solenoid/
Comp. Contactor Relay
Fan Relay
Blue
Orange
Yellow
Red
Black
Empty
Red
Green
White
Black
EEV
A
B
Shield
RS 485
Line/L1
Neutral/L2
Incoming Power
Red (+5 VDC)
Black (0 VDC)
Green (Signal)
Pressure Transducer
NO
COM
NC
NO
COM
Ground*
EAR
TH
Chassis
Ground*
Fuse
NO
COM (L2)
+
–
+
–
*Use only chassis
ground
or
spade
connector ground.
**Requires PN 21034 Solid State Relay (NO) or
PN 22005 Solid State Relay (NC) depending on
purpose. Additional wiring/relays may be required.
BOOT
RST
PWR
BL/BK
OR/BK
Y/BK
FAN/S
HEATERS
LL SOLENOID/COMP RELAY
BK/OR
L1
WT/R
L2
HS
GND
P/N 20996
12 AMP
20 AMP
3 AMP
OR NEUTRAL
HEATERS
therm
solutions
®
R/W
BL/BK
BK
BL/BK
FROM
CONTROLLER
EC MOTOR
RELAY
Supply Voltage
Fan
Motor
Fan
Motor
Fan
Motor
Evaporator
Fans
Heater Safety/High Limit Switch
Defr
ost H
ea
ters
Liquid Line S
olenoid
N.C.
2
4
6
8
1
0
1
0
2
4
6
8
3
7