Harris pump shows E15 and runs only at a default speed or not at all

Safety first: Turn off power before performing any internal inspections.

• Factory reset: Use the Harris pump keypad to perform a factory reset of all speed and schedule settings (refer to the user manual for the exact key sequence).
• Reprogram speeds: After reset, re-enter desired speed settings and schedules. Avoid interrupting power during programming.
• Install surge protection: Add a surge protector to the pump circuit to reduce future memory corruption from spikes.

If E15 returns after a reset, the control PCB memory is likely failing and the control module should be replaced.