I am having a problem with my undercarriage staying on for only 6 seconds when it should stay on for 30 seconds. So the culprits are the entry banner eyes, what is weird is the eyes are giving 2 pulses when the eyes are blocked once. I swapped the eyes with the front treadle eyes and the undercarriage worked perfectly.
The Water Wizard uses the same Banner eyes for the front (treadle) and the back (entry, undercarriage). These eyes are in pairs with one receiver and a super duper laser emitter. The Banner emitter is the SM306EQ and the receiver is the SM30SN6RQ.