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ACORN 80/180 Maintenance, Repair & Service Manual


Acorn 180 Curved Stairlift Repair troubleshooting tips, common stair lift problems and tips If your stair lift is not operating, making a unusual noise or it keeps beeping there a few tips you can try.may save you a repair call out and even get your lift up and running again.


Carriage Operation


The carriage comprises a power bogie (PB) and a levelling bogie (LB) mounted on a common frame (F). The carriage is held square on the rail by side rollers (S) on both power and levelling bogies. The downward weight of the power bogie is taken on the support wheel (SW) running on the bottom of rail (R). The support wheel may bear against underside of the rail when negotiating vertical bends. The downward weight of the levelling bogie is taken on the top roller (TR) running on the rail (R). The drive motor (DM) rotates a pinion (P) on a rack to drive the carriage along the rail. The levelling motor (LM) adjusts the frame to maintain the seat upright when moving over vertical bends. An over-speed governor (OSG) will activate and stop the carriage in the case of an uncontrolled descent.


Vertical bends connect horizontal and sloping rails (R). When the carriage moves over vertical bends the levelling motor (L) adjusts the frame to maintain the seat in an upright position. All side rollers (S) on both bogies are mechanically adjusted to remain horizontal with the rail. An anti-tilt mechanism (A) prevents the carriage from tipping excessively in the event of a levelling failure.


Horizontal bends connect horizontal rails (R) at 90˚ to each other. When the carriage moves around horizontal bends the power bogie (PB) and levelling bogie (LB) pivot in the frame as the carriage moves around the bend.

When the carriage moves around helical bends, both levelling and pivoting operations occur at the same time. Carriage speed is decreased when traversing vertical bends, inside horizontal bends and helical bends. The speed sequence is programmed during installation. If battery power is lost the datum setting must be re-programmed. The carriage has a “soft” start and stop feature


Testing & Setting

OVERRIDE INSTRUCTION. If the number 6 shows:

1 Switch off lift at on/off switch. 2 Put call in using rocker switch in required direction. 3 Switch on lift with on/off switch whilst holding the call in on the rocker switch. 4 The lift will now drive.


Programming Modes


This procedure describes how to completely program the Stairlift. If the batteries are disconnected at any time the program will be retained, except for the Datum Position and Top Terminal limit, which then must be re-programmed in. The lift orientation is set Left Hand or Right Hand for the program. Factory set. A datum position is set at the top of the rail as the lift leaves the top charge point. The top charge point position is set (Terminal Limit). Carriage speeds are programmed in as the lift moves down the rail. The bottom charge point position is set (Terminal Limit). Programming is then completed for both up and down travel. Three carriage speeds are possible: CREEP SPEED (slow) is the default setting and is used just before stopping. BEND SPEED when moving around vertical, inside horizontal bends and helical bends. It is also used as an intermediate speed. FULL SPEED along straight rail sections.


More Codes

Acorn/brooks 180 curve codes 



Batteries are not being recharged, A1 flashing on the fault indicator, and hear a beep alarm. The stairlift will beep intermittently for 60 seconds and stop entering hibernation mode. The stairlift will beep intermittently every 20 seconds and the fault indicator will go blank. Make sure the mains electricity supply should always be switched on and the stairlift parked on its charge points. The symbol will display C1 when charging or C4 when fully charged. If the batteries have lost their charge because the mains electricity supply has been switched off, or interrupted, allow them to recharge before using the stairlift


 Moving Up  No action required


 Moving Down  


Moving Up (Remote control)  


Moving Down (Remote control)  


Stairift waiting for hinge to operate  


 “Normal” Stairlift is on charring mode  


 Batteries are fully charged  


Down side foot sensitive safety edge has been activated. Check for obstructions.


UP side foot sensitive safety edge has been activated Check for obstructions.


Under foot plate sensitive safety edge has been activated Check for obstructions.


Down side sensitive safety edge has been activated Check for obstructions.


Up side sensitive safety edge has been activated Check for obstructions.


The seat is swivelled away from its operating position  


Battery flat – Audible alarm Press the arm switch control or the remote control once to stop the alarm. Bring the unit down to the nearest charging station.


Safety gear is on! Contact your stairlift Repair Company immediately.


Common Faults, Error and Codes For The Acorn 180 or Bison 80 Stairlift.


Stairlift-180 problems




Over speed governor fault The over speed governor is having a problem or needs to be reset. call your local engineer.


Batteries not charged Drive the stairlift on the nearest charging point 


accelerometer sensor fault  Call a local engineer 


Stairlift Seat is not level.  Manualy turn the seat shaft with the hand winder and level the seat . if this continues call you local engineer.

Lost datum/ Programming fault  Call you engineer 
Stairlift is on searching mode Call you engineer 
Why is my acorn/brooks curved stairlift is not level? 
NOTE: Leveling the seat of Acorn 180 or Bison 80 

The pentionemeter levels the stairlift and it should come level from the factory. However, there may be a time that you need to adjust it. Notice the small blue box at the bottom of the circuit on the picture below. Now notice the tiny copper screw on the bottom left of the blue box. This screw will adjust the level. You must have the chair in program mode and moving in order to notice the level of the machine. Adjust it slightly as the machine moves and stop when the carriage is level according to a leveling tool. Note: if the chair is tilting heavily at random times, you may have an encoder problem and not a pentionemeter problem.

Acorn 180 curved stairlift repair

More common problems with acorn/brooks 80 and 180 

Error code F1: this fault is a relay fault in the main PCB caused by hot switch relay signals switch. 


You can reset the fault by taking the front panel screws and get access to the main board , by taping the relay b a screw driver as it showing in the picture, you will release the relay from being jammed, this method is only an emergency to get your stairlift back in working order, we strongly advice to get in contact with your local stairlift company and get it sorted asap. 


OSG setting 

In the fallowing Video Showing the OSG moving and how it works and fully reset. .   


  • If you Remove the Power Bogie covers to get access the over speed governor OSG.
    Check that the Regulator and Trigger arm are in the position shown below.


You can contact us on 0800-5677033 for any advice or you can leave a comment below and we will replay asap.