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5. Heater Not Firing
The ProLogic features a normally open circuit for each heater. When heat is called for,
based on the temp set point and water sensor, the low voltage contact will close; once
closed, the low voltage supplied by the heater should be returned to it.
Check main circulation pump
Verify the heater LED is ON
Step 5A
Step 5B
On the display, verify that the Filter relay is activated
On the local display, with the main circulation pump
(denoted by an illuminated Filter LED). Also, verify the
running, verify the Heater LED is illuminated. IF the
main circulation pump is running. IF the pump is off and
heater LED is not illuminated, go to step 5C. IF the
cannot be turned on through the controller, go to
heater LED is illuminated, proceed to step 5D to test
section 6. IF pump is running, proceed to step 5B.
the heater relay.
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