July 30, 2021
#
Remedy
Ensure voltage selector switch is set to the proper setting (115V or 230V) and power harness is connected to controller board.
Use a voltmeter to verify that proper voltage is present on terminal board (L1, L2) on evaporator.
Inspect controller board for visual signs of damage (discoloration, burn marks, broken components, etc.). If damaged, replace
controller board. Make sure that new controller board has voltage selector switch to correct setting (115V or 230V)
before
applying power to the unit.
2
Replace controller board.
Ensure voltage selector switch is set to the proper setting (115V or 230V) and power harness is connected to controller board.
Ensure power is connected to terminal board (L1, L2, GND) on evaporator.
Verify fan wiring diagram on unit and ensure that fans are wired to controller: WHITE wire to L2, BLACK wire to Aux Relay 1 on
controller board, RED wire to Aux Relay 2 on controller board. Verify wires from Aux Relays 1 and 2 are connected to L1 on
terminal board. Verify each of the EC fan motors has all the wires connected (WHITE, BLACK & RED). Verify Aux Relay status:
when Aux 1 Relay is ON, fans run at full speed; when Aux 1 and Aux 2 Relays are both ON, fans run at half speed. LED will turn
ON next to each relay on controller board to indicate relay is active. User can also verify Aux Relay 1 and 2 status via display
under
Status →Outputs→Aux Relay #1/Aux Relay #2
.
Replace fan motor.
Verify fan blades and fan guards are free of obstruction.
On controller display, go to
Settings →System Enabled
and ensure it is set to YES.
Controller is waiting on Evap Temp 1 (and Evap Temp 2 on Dual Coil units) to get cold enough before allowing fans to run. If
unit is set to FREEZER, Evap Temp has to get below 35F for fans to run; if unit is set to COOLER, Evap Temp has to get below 55F
for fans to run. Verify Aux Relay status: when Aux 1 Relay is ON, fans run at full speed; when Aux 1 and Aux 2 Relays are both
ON, fans run at half speed. LED will turn ON next to each relay on controller board to indicate relay is active. User can also
verify Aux Relay 1 and 2 status via display under
Status→Outputs→Aux Relay #1/Aux Relay #2
.
If unit is set to Freezer, it could be defrosting.
Wait for defrost cycle to finish.
Verify fan wiring diagram on unit and ensure that RED wire is connected to Aux Relay 2 on controller, and connected to every
fan motor. Verify wire from Aux Relay 2 is connected to L1 on terminal board. Fans should go to half speed when box
temperature setpoint is satisfied. Verify Aux Relay 2 status via LED on controller next to the relay connectors, and via display
under
Status →Outputs→ Aux Relay #2
.
Verify if the unit installed has PSC fan motors. PSC fan motors operate at full speed only or OFF. There will not be a wire
connected to Aux Relay #2.
Verify Setpoint and Space Temp reading. If Space Temp is higher than Setpoint plus the Setpoint Control differential, allow the 2
minute minimum off time to finish for cooling to start again.
If controller has software version HT‐PG01‐00‐01‐13 or earlier, and is configured as Cooler, the air defrost cycle will run the fans
at half speed. More recent software versions will have the air defrost cycle run the fans at full speed. Allow the air defrost
cycle to finish; if fans do not go to full speed when cooling starts again, proceed to next possible cause below.
When cooling is enabled (EXV is open), verify Evap Temp 1 (and also Evap Temp 2 on Center Mount units) gets cold enough
(under 35F for Freezer, under 55F for Cooler). If Evap Temp reading is significantly higher (warm box, malfunctioning Evap
Temp sensor), the fans will remain off initially, then run at 50% speed after an some time if the temperature still has not
dropped.
Verify that there is no visible damage or burn marks on the Aux Relays. Verify the status of each Aux Relay via the LED next to
each one, via display under
Status→Outputs→Aux Relay #1/Aux Relay #2.
Relay operation for fan speed control is as follows:
Aux Relay #1 ON = Full Speed; Aux Relays #1 & #2 ON = Half Speed; Aux Relays #1 & #2 OFF = Fans off. If damage on the Aux
Relays is visible, replace controller.
If Aux Relays do not look damaged, confirm that Aux Relay #2 is OFF (visually inspect LED is off, status on display indicates OFF).
Power off unit and temporarily disconnect the red wire from Aux Relay #2. When unit is powered back on, verify fan speed
when Aux Relay #1 turns on. If fan motors are still running at half speed, proceed to troubleshoot fan motors. Reconnect red
wire when finished.
Ensure voltage selector switch is set to the proper setting (115V or 230V) and power harness is connected to controller board.
Ensure power is connected to terminal board (L1, L2, GND) on evaporator.
On controller display, go to
Settings →System Enabled
and ensure it is set to YES.
If the controller detects that the
Space Temp
sensor input is missing, it will attempt cooling operation in fixed intervals based
on previously calculated runtime averages until the sensor is replaced. Also, while the sensor is disconnected, Space Temp will
read "‐60 ⁰F" and a "
A103
Space Temp Thermistor Failure
" alarm will be generated (viewed on the display under
Service →Current Alarms
). Replace the Space Temp sensor as soon as possible to resume normal cooling operation based on
the configured Setpoint. (Part no. 08219623)
Verify EXV is properly connected to wire harness and that none of the 4 prongs are bent or missing. Verify on wire harness
connection at the controller that no wires have come loose from the connector. Verify that controller is commanding EXV to
open by looking at the display under
Status →EXV→ EXV Current Pos.
To do a quick verification if the valve is working, a)
disconnect power to the controller and listen for movement of the EXV (controller will force valve to close completely when
power is disconnected), OR b) go to
Settings →System Enable
and set it to NO. Reconnect power to the controller, or set
System Enable
back to YES, and wait a couple of minutes to listen for EXV movement (valve should open if Space Temp Setpoint
is not satisfied). See
Addendum A
on how to troubleshoot the EXV.
8
Verify Suction Pressure reading on the display under
Status →Sensors→Suc on Pressure
. If the system is charged properly, the
Suction Pressure reading should start increasing as soon as the valve opens. Verify at the condensing unit if the compressor is
running. Verify that power to the condensing unit is turned ON. Verify that the cut‐in/cut‐out pressure switches at the
compressor are set properly for the refrigerant being used (refer to condensing unit installation manual).
EcoNet Evaporator Controller
Troubleshooting Guide
1
No power to controller.
One or more fan wires are disconnected.
Fan motor could be damaged.
Evap Temp 1 temperature is not cold enough (on
Single Coil units); Evap Temp 1 and Evap Temp 2
temperatures not cold enough (on Dual Coil units).
EcoNet controller could be manually disabled;
System Enabled is set to NO in the controller
settings.
4
None of the fans are running.
3
One or more fans are not running.
Fan blades could be obstructed.
Controller turns on but display is missing
lines or blank.
EcoNet Controller does not turn on.
No power to controller
Controller board could be damaged.
Controller board display is damaged.
5
7
Half speed fan wire (RED) could be
disconnected/loose.
Controller could be manually disabled; System
Enabled is set to NO in the controller settings.
No power to controller.
Controller could be enabled, but EXV is not
opening.
Verify if compressor is running.
EXV is operating, but unit is still not
cooling.
6
Unit is not cooling.
Fans run but never go to half speed.
Unit has PSC fan motors installed.
Aux Relays could be damaged
Fan motors could be malfunctioning
Cooler is in the middle of a defrost cycle
Problem
Space Temp sensor is disconnected.
Possible Cause
Fans run but never go to full speed.
Setpoint is satisfied
Evap Temp is not low enough.
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