The motor-driven Water Works mini flipper does nothing in test or in play. It had been working only intermittently before that, and its drive band is fine.

Water Works mini flipper motor dead: failed relay on the bi-directional board

Cause: The direction relay on the bi-directional motor board had failed; it had been taped down as a hack, so it no longer made clean contact in either position.

Checks

• Inspect the relay on the bi-directional board for a missing cover, tape or other hacks.
• At rest the relay's common contact should rest on the outer contact; energized, it should pull over to the inner contact. Check that it makes firm contact in both positions.

Fix

• Replace the relay on the bi-directional board (match the part number printed on it).

Systems

• Sega/Stern Whitestar

Games

• Monopoly

Related tips

• Goalie works on and off, then stops: worn relays on the boards under the playfield

Source: Pinball Repair help group!! (Facebook group)