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CONTROLLER DIAGNOSTIC CHART
Condition
Controller does not operate / No display
12V voltage indicator flashing
24V voltage indicator flashing
Sensor open circuit
Sensor short circuit
Low Temp
<40°C (104°F) after 5 Minutes
Above Set Temperature
Pump Error
Override ON
ERR
Troubleshooting
Blown fuse
•
Check all the wire connections
•
Controller receiving low voltage <
•
10.5V
Controller receiving high voltage >
•
17.5V
Controller receiving low voltage <
•
21.5V
Controller receiving high voltage >
•
27.5V
Check sensor wiring for any open
•
circuits
Check sensor wiring for any short
•
circuits
Check engine temperature
•
Sensor temperature is at least 10°C
•
(18°F) above the set temperature.
Check pump wiring for open/short
•
circuits
EWP manually override by the user.
•
To turn OFF, Press & hold the set
•
button for 5 to 7 seconds or switch
OFF & ON the IGN.
Temp sensor Open or Short circuit
•
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