How to repair a 546 efx precor

ernesto cuadra

• 12223 Answers
• Posted on Mar 15, 2013

SOURCE: precor efx 546 error.

please follow this steps and fix it. God bless youError 43 - Zero Switch not FoundDescriptionThe C944 and several versions of C96X used a lift position identification system that did notutilize a potentiometer.Instead, it utilized a switch that would be physically actuated by the lift when the lift was in thezero incline position. A revolution sensor counted lifted motor revolutions to determinesubsequent lift positions. In addition two limit switches where used to remove power from the liftmotor if the lift moved outside of it's normal range.When the unit was powered up the lift would start to hunt for the zero switch. It would first go up4% (maximum lowest physical position was -3%) if it did not find the zero switch or it hit the upperlimit switch, it would then go down until did find the zero switch. When the zero switch waslocated it would stop, the system would then know its physical position and be prepared tomonitor the revolution sensor. If during this power up procedure the zero switch was not found anerror 43 would be displayed.Possible Causes1. The lift position actuator does not physically operate the zero switch.2. The lower PCA is bad.3. The zero switch is bad.Possible Remedies1. There are several physical problems related to the lift platform mounting or the plate the zeroswitch is mounted on that can cause the actuator knob to miss the zero switch as it movespast. Repair the lift platform mounting, repair or replace the lift switch mounting plate asrequired.2. The lower PCA provides a 5 VDC power source for the zero switch. You should measure 5VDC across the zero switch when the zero switch is activated. If the reading is significantlylow, remove both wires from the zero switch and repeat the measurement across the wiresremoved from the zero switch. If the reading is still significantly low, verify the zero switchwiring. If the wiring is intact and correctly connected, replace the lower PCA.3. Move the lift to position where the zero is switch is not activated and remove power from thetreadmill. Remove both leads from the zero switch and measure the zero switch with anohmmeter. The zero switch should read very near 0 ohms. While measuring the zero switchwith the ohmmeter, activate the switch by hand, the reading should change to infinite (open).If either of the above readings are significantly incorrect, replace the zero switch.