Removed Filter. Reset Breaker. Ran and heated without filter. However, it seemed like the heater light shut off prematurely, perhaps before reaching the full temperature. Once the jets were shut off, it did the same thing as before where limit light shuts off, d17 is the only light lit and power button flashes once again. Oh, by the way, when filter is removed, circulation pump feels like it is running when i palm it with my hand. Thanks.