What could cause a Stannah stairlift to ascend without descending?

A Stannah stairlift that ascends but will not descend usually has a problem affecting the downward control circuit rather than a complete power failure. Common causes include an obstruction, an activated safety sensor, an incorrectly positioned seat or swivel mechanism, a faulty armrest control or remote, and a loose connection or fault in the wiring, motor control or limit-switch system.

Because the lift can travel upwards, its batteries, track and drive system may still be working at least partially. However, this does not rule out a component that is only used, or only fails, when the stairlift is commanded to travel downwards. Do not continue operating the lift repeatedly to test it, and never bypass a safety switch or sensor.

Start with these safe visual checks:

• Make sure the stairlift track is clear of clothing, bags, furniture, pets and other objects.
• Check that the seat is fully swivelled back into the travelling position and that the swivel lock has engaged.
• Confirm that both armrests are lowered correctly and that the footrest is not catching against a step, wall or nearby object.
• Check that the key switch, if fitted, is in the operating position and that the main power switch has not been turned off.
• Look for anything pressing against the safety edges around the footrest, carriage or chassis. Remove only an object that can be safely reached without placing yourself in danger.

A safety sensor can prevent movement in one direction if it detects pressure or an obstruction. Depending on the model, the stairlift may stop immediately, refuse to move, or produce an audible warning. A sensor may appear clear but remain activated if the footrest is misaligned, the carriage is not sitting correctly on the rail, or an edge has been damaged. Do not tape, hold down or otherwise defeat the sensor; it is there to stop the lift when a person or object could be at risk.

The operating control is another possible cause. Try the armrest control only after confirming that the lift is safely positioned and clear to move. If the lift descends from the remote but not from the armrest control, or does the opposite, the problem may be limited to a control switch, receiver or connection. If neither control operates the downward movement, the fault is more likely to involve the safety circuit, wiring, control board, motor control or a directional component. Remote batteries can also become weak, although this would normally affect the remote’s operation rather than the stairlift’s ability to descend specifically.

Check the display, indicator light or warning tone for any fault information, where your model provides it. A power light only confirms that some power is reaching the stairlift; it does not prove that every safety circuit, switch or drive component is functioning correctly. If the lift has stopped part-way up the stairs, leave it where it is unless the manufacturer’s instructions provide a specific safe recovery procedure. Avoid forcing the controls or attempting to move the chair manually.

Wiring faults can affect one direction of travel if a connector is loose, a cable has been strained, or a switch contact has failed. The downward command may also be interrupted by a faulty limit switch or control-board component. These parts require testing with the correct equipment and access to the stairlift’s electrical and diagnostic systems. Do not remove covers or work on wiring while the stairlift is powered, particularly if this could expose you to moving parts or electrical connections.

If the basic checks do not restore downward travel, stop using the stairlift and contact Independent Stairlifts for a professional assessment. Provide the model information, the position of the lift, whether it makes a warning sound, whether the display shows a fault, and whether the armrest control or remote behaves differently. This information can help the engineer identify whether the likely cause is a sensor, control, connection or drive fault.

Until it has been checked, keep the stairs clear and use an alternative safe route if one is available. A stairlift that travels in one direction is not safe to rely on as normal, even if it appears to be working otherwise. Professional diagnosis is the appropriate next step, particularly if the fault recurs after a reset or if the stairlift stops midway.