My Pro-Form 330 elliptical has a resistance problem--it won't adjust and it seems to be set on a difficult resistance, I can't really pedal it. how do I fix this? I tried switching the levels, but it doesn't

please obserbe 2 things:
1) Clean the magnet very well, grasp with a Knife.
2) If after that the Sensor switch or Reed switch Not working , the contacts in the terminal of Display are Dirty or corroded, clean with Special contact cleaner for electronic. Other wise the display is faulty, repair or replace.
[email protected]
whatsapp:+50588611441

You may need someone to look at this on the inside. You need a professional.

please follow the next steps. God bless you
Check your owner's manual for diagrams and definitions. You'll need this information when you put the elliptical back together. You'll also want definitions in case you need to call the customer support line for assistance.

2 Be aware that the resistance is often the part that requires repair. Resistance is managed magnetically, so often if the machine is working, but the resistance isn't setting correctly or at all, check the bolts that secure the magnets. If they are loose, the resistance will slip. If the bolts are fine, check the magnets themselves by using a refrigerator magnet and see if it is attracted or repelled by the your fridge magnet. If not, the magnets have de-magnetized and need to be replaced.

3 Consider that if the foot pedals are attached with bolts, any slipping can be fixed with a quick use of the wrench. But if the foot pedals are damaged or breaking, order new foot pedals (see Resources below) rather than run the risk of a pedal breaking while you're on the machine.

4 Check the hand bars. While not all people use them, as they can elevate your heart rate by up to 20 percent, they can become worn, too. While loose hand bars typically need a simple tightening of the bolt, be sure not to overtighten as the bolts can break.

5 Know that if the axis is bent, it's likely you need a new machine. The axis is the central alignment of the elliptical. If the machine was used by a person who is over the maximum weight limit, it can be bent or damaged. It's not an easy fix and a better idea is to upgrade to a sturdier machine.

follow this steps, God bless you

1. • Be aware that the resistance is often the part that requires repair. Resistance is managed magnetically, so often if the machine is working, but the resistance isn't setting correctly or at all, check the bolts that secure the magnets. If they are loose, the resistance will slip. If the bolts are fine, check the magnets themselves by using a refrigerator magnet and see if it is attracted or repelled by the your fridge magnet. If not, the magnets have de-magnetized and need to be replaced.
     
   • Consider that if the foot pedals are attached with bolts, any slipping can be fixed with a quick use of the wrench. But if the foot pedals are damaged or breaking, order new foot pedals (see Resources below) rather than run the risk of a pedal breaking while you're on the machine.
     
   • 
     

This happened to me and I took the wheel mechanism cover off to discover the tension motor cable had come out of it's pulley guide- so there wasn't enough tension left in the cable to pull it away from the wheel- quite an easy fix for me- hope it is the snake for you!

Open the rear part where the "guts" are. The magnet will be stuck against the wheel that turns when you pedal because the cable that the resistance motor pulls to remove the tension will have too much slack in it. The cable probably came off of the pulley wheel that is used to providing the necessary tension to pull the magnet off of the wheel.

To get the case off, simply unhook the right side pedal, remove the 4 bolts holding on the crank thing to remove it, then using a philips head screwdriver, remove the screws in the screw holes on the case cover. Be sure to remove the one screw on the other side near the front in order to allow the front part to "unsnap".

To mount the elliptical trainer, firmly hold the handlebars or the T-handle and carefully step onto the pedal that is in the lowest position. Next, step onto the other pedal. Push the pedals until they begin to move with a continuous motion. Note: The pedal disks can turn in either direction. It is recommended that you turn the pedal disks in the direction shown below; however, to give variety to your exercise, you may choose to turn the pedal disks in the opposite direction.
To dismount the elliptical trainer, allow the pedals to come to a complete stop. CAUTION: The elliptical trainer does not have a free wheel; the pedals will continue to move until the flywheel stops. When the pedals are stationary, step off the highest pedal first. Then, step off the lowest pedal.
As you exercise, you can adjust the resistance of the pedals with the resistance knob on the console. To increase the resistance, turn the knob clockwise; to decrease the resistance, turn the knob counterclockwise.

If you purchase from a store I would take it back and exchange it, or if you purchased it on line then the manufaturer and have send somebody out to take care of this situation you have a warraty on the unit

Was this at a retail store you should exchage it.
If not then you will have to take the side off need to inspect all mechanical attached to the rails. It will be apparent to see the flywheel their eddy current transformer on top of unit or the flywheel itself is one package their should be are wire comming out of trace it back to the circuit unplug the connectors the resistance should be gone now test the mechanical function of unit to see if the pedal are free from any binding then reverse connectors and see if you can adjust the resistance if not the board is defective.

If you can hear the adjustment motor running the problem could be related to two things:
1. Broken or stretched resistance adjustment cable.
2. Broken bracket for the magnet return spring.
If the resistance is on maximum all the time the second issue is most likely the cause.