Dolphin reversing constantly

dolphin

The Problem

A Dolphin that constantly reverses is usually reacting to an obstacle it cannot navigate past — a taut cable, a pool step geometry, or a navigation fault triggered by a sensor or motor issue. Frequent reversing significantly reduces cleaning coverage.

Steps

1
Pull the robot out and uncoil the full cable on the deck. Re-enter the robot with maximum cable slack and observe whether the reversing persists.
2
Clean the filter thoroughly and restart the cycle. A blocked filter reduces floor grip, which can trigger obstacle detection.
3
Try starting the robot from a different position in the pool, away from any steps or raised features.
4
Perform a full reset: unplug the PSU from the wall, disconnect the cable, wait 90 seconds, then reconnect and restart.
5
Flip the robot and inspect both drive belts. Replace any belt that is cracked, stretched, or has lost tension.
6
If the reversing only happens in one area of the pool, check that area for physical features (steps, returns, skimmer) that may be triggering the obstacle detection.

Possible Causes & Solutions

common

Cable snagged or under tension, acting as a false obstacle

The robot's obstacle detection triggers a reverse when it meets resistance. A taut cable mimics a wall. Uncoil the full cable and re-enter the robot with plenty of slack.

common

Pool step or wall edge causing repeated collision

Some pool geometries cause the robot to repeatedly drive into an obstacle it cannot overcome. Try starting the robot from a different position, away from the problematic feature.

occasional

Drive belt loose or slipping on one side, confusing navigation

A slipping drive belt causes the robot to stall against surfaces it would normally pass over. Inspect the drive belts and replace any that are stretched or cracked.

occasional

Obstacle sensor stuck in a triggered state

Perform a full reset: unplug the PSU, disconnect the cable, wait 90 seconds, then reconnect. This clears any stuck sensor state in the control board.

occasional

Filter blocked, reducing suction and causing floor grip loss

A fully blocked filter reduces the suction that anchors the robot to surfaces. Loss of suction on slopes or at wall transitions can trigger the reverse response.

When to Replace

Replace drive belts when cracked or stretched. If the constant reversing persists after cable correction, filter cleaning, and a full reset, contact Maytronics support as a navigation sensor or motor issue may be present.

Where to Buy

Find compatible replacement parts from these retailers:

Check price for dolphin replacement parts on Amazon

Compatible Parts

Drive Belt Kit

Model-specific. Confirm compatibility with your Dolphin model before ordering.

Dolphin Replacement Filter Basket

Clean or replace the filter regularly to maintain suction performance.

Frequently Asked Questions

Is constant reversing a sign of a serious fault?

Not always. The most common cause is cable tension or pool geometry, which is easy to fix. A persistent reversing problem that does not respond to cable correction or reset may indicate a sensor or motor issue.

My Dolphin reverses at the same spot every cycle — what is happening?

A specific trigger point is almost always a pool feature — a step edge, a return jet, or a raised tile — that the robot's obstacle detection cannot overcome. Try starting the robot from the opposite end so it approaches that feature from a different angle.

Can a reset fix constant reversing?

If the cause is a stuck sensor state, yes. If the cause is cable tension or a physical obstacle, a reset will not help — address the root cause first.