If your Precor treadmill is showing error 42, you know how frustrating it can be. This guide will show you how to fix error 42 Precor treadmill with clear, step-by-step solutions. It’s a common issue that usually points to a problem with the lower controller board or its connection, but don’t worry—many fixes are simpler than you might think.
How To Fix Error 42 Precor Treadmill
Error 42 on Precor treadmills, like the popular 9.3x models, typically indicates a communication failure between the console and the lower electronic controller. This means the console isn’t receiving the expected signal from the main board underneath the treadmill. The good news is that the solution often involves checking connections and components you can access yourself.
What Causes the Precor Treadmill Error 42?
Before you start taking things apart, it helps to understand what triggers this error. The main culprits are usually related to wiring or electronic components. Here are the most common causes:
- A loose or corroded cable connection between the console and the lower controller.
- A failing lower electronic controller (the main circuit board under the treadmill deck).
- A damaged wire harness or broken wires within the cable loom.
- In rare cases, a faulty console display board itself.
- Power surges or irregular electrical supply that disrupts the boards communication.
Safety First: Unplug Your Treadmill
Before you perform any inspection or repair, you must disconnect the treadmill from its power source. Unplug it directly from the wall outlet. This is non-negotiable for your safety and to prevent damage to the electronics. Do not just turn it off—physically unplug it.
Gather Your Tools
You likely have most of these items at home. You’ll need:
- A Phillips head screwdriver.
- A multimeter (for advanced electrical checks).
- A clean cloth and some isopropyl alcohol for cleaning connections.
- A well-lit workspace.
Step-by-Step Fixes for Error 42
Follow these steps in order, starting with the easiest and most common solutions first.
Step 1: Perform a Power Reset
This simple step can clear temporary electronic glitches. Unplug the treadmill from the wall and wait for a full 5 minutes. While it’s unplugged, press and hold the power button for 30 seconds to discharge any residual power. Then, plug the treadmill back in and try starting it. Sometimes, that’s all it takes to clear the error.
Step 2: Check and Re-seat All Cable Connections
Loose connections are a prime suspect. You’ll need to access the lower controller, which is located under the motor hood at the front of the treadmill.
- Carefully remove the motor hood cover. This usually involves removing several screws along the sides and front.
- Locate the lower controller board. It’s a rectangular circuit board with multiple wire harnesses plugged into it.
- Identify the cable that runs up to the console. It’s often a wide, flat ribbon cable or a multi-pin harness.
- Gently unplug this cable from the lower controller board. Inspect the pins for any signs of bending or corrosion.
- Plug the cable firmly back in, ensuring it’s fully seated. Also check and re-seat any other visible connections on the board.
- Do the same at the console end if you’re comfortable removing the console shroud.
- Replace the motor hood and plug the treadmill back in to test.
Step 3: Inspect the Wire Harness for Damage
With the motor hood still off, visually trace the console cable along its entire length. Look for any pinches, cuts, or fraying. The area where the cable bends near the console mast is a common failure point. Gently flex the cable while looking for broken wires inside the insulation. If you see damage, the entire harness will need to be replaced.
Step 4: Clean the Cable Connectors
Dust and corrosion can interrupt signal. If the connections look dirty or have greenish residue, clean them. Use a cotton swab lightly dampened with isopropyl alcohol to clean the pins on both the cable and the board. Let it dry completely before reconnecting. This can often restore a good connection.
Advanced Troubleshooting: The Lower Controller Board
If the error persists after checking connections, the lower electronic controller itself may be faulty. This is the most common hardware cause for error 42.
How to Identify a Failing Controller
Signs include visible damage like burnt spots or bulging capacitors on the board. A more reliable test is to check for power and communication signals with a multimeter, but this requires technical skill. For most users, if all connections are secure and the error remains, the controller is the likely culprit.
Replacing the Lower Controller Board
You can order a replacement board using your treadmill’s model number. Replacing it is straightforward:
- Unplug the treadmill and remove the motor hood.
- Take a photo of all the wire connections to the board for reference.
- Carefully label each connector with tape if needed.
- Remove the screws mounting the board to the frame.
- Disconnect all wire harnesses from the old board.
- Connect all harnesses to the identical spots on the new board.
- Secure the new board with screws and replace the hood.
Make sure you get the correct part number, as controllers vary between models.
When to Call a Professional Technician
Some situations warrant expert help. Consider calling a certified Precor technician if:
- You are not comfortable working with electronics or wiring.
- The error continues after replacing the lower controller (pointing to a possible console fault).
- Your treadmill is still under warranty—DIY repairs can void it.
- You suspect a motor or drive system issue that’s triggering the error indirectly.
Preventing Error 42 in the Future
A little maintenance goes a long way. To reduce the chance of this and other errors:
- Always plug your treadmill directly into a dedicated wall outlet, not a power strip or extension cord.
- Use a high-quality surge protector designed for fitness equipment.
- Keep the motor area clean and vaccuum around it regularly to prevent dust buildup on the electronics.
- Avoid spilling liquids on or near the console.
FAQ: Precor Treadmill Error 42
What does error 42 mean on a Precor treadmill?
It indicates a loss of communication between the console display and the lower electronic controller board. They are not “talking” to each other properly.
Can I still use my treadmill with an error 42?
No. The treadmill will not operate with an active error 42. It’s a safety feature that prevents use when the console cannot control the motor.
Is error 42 expensive to fix?
It can be. If it’s just a loose cable, it costs nothing. A new lower controller board is a significant part, often ranging from $200 to $500, plus labor if you hire a tech.
Are there other Precor errors similar to 42?
Yes. Errors like 41, 43, or 44 can also relate to communication faults or specific sensor failures. The troubleshooting process is very similar, starting with cable and connection checks.
Will resetting the treadmill fix error 42?
A full power reset (unplugging for 5+ minutes) can sometimes fix it if the cause was a temporary electronic glitch. It’s always the best first step to try.
Fixing error 42 on your Precor treadmill is usually a matter of patience and careful checking. By starting with the simple power reset and moving methodically through cable inspections, you can often solve the problem yourself. If the lower controller is indeed faulty, replacing it is a manageable task with the right part. Remember, regular maintenance and proper power supply are key to avoiding these issues and keeping your treadmill running smoothly for years to come.