I have a Precor 546i cross trainer.there is no display on console.after few secs it gives error 30.

Everything is fixable :>)

Service manual in the link

https://www.google.com/search?q=Precor+546i+Elliptical+Cross-Trainer+stuck+at+highest+position

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Precor Error 30, 31, 32 and 33, Communications Error Probable Cause 1. Bad interconnect cable between upper PCA and lower PCA.
2. Interconnect cable is mistakenly plugged into the CSAFE connector at the upper PCA.
3. Elliptical 5.17 equipped with old software version 1.01 in upper and lower PCA.
4. Upper and lower PCAs have mismatched software.
5. Another component plugged onto the PCA is overloading the +5VDC power supply.
6. Bad lower PCA.
7. Bad upper PCA.
Corrective Action

1. Test unit with a know good interconnect cable or test the interconnect cable for continuity. Replace interconnect cable if necessary.
2. Disconnect the interconnect cable from the CSAFE connector and attach to the proper position on the upper PCA.3.
3. Replace the upper and lower software of the 5.17 elliptical with the most current versions.4.
4. If one of the PCAs is found to have software version 1.01, replace it with the most current software version.
5. Disconnect all components from the upper and lower PCA leaving the data cable connecting between the upper and lower PCAs and the AC power going to the lower PCA. If the unit shows any error other than the error 3x, reconnect components one at a time. Reset power between each newly connected component until the error 3x reappears. Whichever component was last connected when the error 3x reappears, is the cause for the error. Replace the faulty component.
6. Test unit with a known good lower PCA. Replace the lower PCA if necessary.
7. Test unit with a known good upper PCA. Replace the upper PCA if necessary.

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

Precor EFX 546 Version 1 Elliptical Trainer (Refurbished)

www.amazon.com > ... > Elliptical Trainers

Amazon.com, Inc.
Rating: 4.3 - ‎9 reviews
Working out on an elliptical can burn as many calories as working out on a treadmill. ...allowing you to go forward and backward, as well as adjust stride length to target ...The Precor EFX 546 allows you to stride smoothly while holding the ...

EFX® 546i Elliptical Fitness Crosstrainer™ ' Precor

www.precor.com/en-us/.../efx-546i-elliptical-fitness-crosstrainer-33

With the unique Precor CrossRamp® technology, users can alter the path of the EFX®546i between 13 and 40 degrees in both forward and reverse stride motions, cross ...Excellent stability and freedom of movement for users of all sizes.

FAQ - Precor

If you have a stuck key error, you need to replace the keypad. It will not work otherwise.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/russell_1d1c35fa8a5a0be4

Precor Error 05, Key Depressed at Power Up Probable Cause 1. A key is permanently depressed on the display.
2. An interface chip (IC) has failed in the upper PCA's keypad.
3. Liquid (cleaning solution or sweat) may be on the surface of a touch sensitive display.
Corrective Action

1. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 is eliminated, the keypad is the cause and should be replaced.
2. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 still appears, the upper PCA* is the cause and should be replaced. *Upper PCA's most commonly do not come with software. Remove the software (chip) from the existing upper PCA prior to replacement and install into the new upper PCA.
3. Wipe away all liquid from the touch sensitive display. Reset power to the unit. If the Error 05 is eliminated, the liquid was the cause.

Precor Error Code 05

Check the voltage of the battery to start with.
Video about How to Test Battery

error 30 is no power to upper PCA or upper console. I believe in the 546 there are 2 interconnect cables, one lower that runs from the back to the bottom of the mast, and an upper, that runs from the console, down the mast. They meet at the front and connect using what's known as a mid-point connector (technical, I know). Unfortunately, there's no real test available, aside from checking the 3 connections other than substituting out for a known good cable. You can remove the console and ensure that the cable wasn't plugged into the CSAFE port on the console board. Sometimes, if a machine has been transported or moved, this can happen as the CSAFE and LOWER PCA ports are identical, but it's printed on the actual circuit board under it. Now depending on the serial number sequence of the machine, the cable can route a few different ways, although most use a 2 interconnect cable system with a mid-point connector (little black female/female connector) I would be able to get a little more detailed if I had a serial number, the first 4 digits are enough to establish the particulars about a machine.

In diagnostic mode you have 5 modes LED Diagnostics,Lift calibration number check, identify software version, heart rate diagnostic and keypad test. other than that I suspect that the upper console is going south. You can sent the upper console for repair. Contact National Gym Supply @ 1-800-496-7278 and they will give you pricing and address to send to.

Error 50, Too Much Brake (Magnet) Current
The problem maybe lower board related or improper signal is being translated Call Precor @ 800-347-4404

what is the error code displayed