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END/ Heating problems
This code indicates if after 72 hours of continuous heating operation, the system will hibernate
automatically. The defect reason could be heater or a problem with PCB.
1) Before starting the test, ensure that the terminals (9&10) and (11&12) are properly paired up and not
swapped with any other terminal. Test by measuring the AC voltage on the PCB with a multimeter. Set the
multimeter, turn the power on and run the heater function for 20 seconds. Test terminals (9&10) then
(11&12) and look for voltage reading equal the wall voltage.
2) If they do, proceed to testing the current using a clip-on ammeter. Proceed to step 3 if no power is detected.
3) Turn on the Control Base and run the heater function. Test the wiring for terminals (9&10)
and (11&12) and look for a reading between 4 – 6 Aac. Change the heating element if there is no reading.
To change the heating element, first disconnect the flow sensor cables, temperature sensor
cables, power terminals (9 to 12). Remove the 4 screws holding the heating
element. Release the water tube under the heating element by hand. Disconnect the external equipotential
bonding conductors on the heating element. Ensure these equipotential cables are reinstalled.
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