I have 23 years experience fixing all types and brands off exercise equipment.
I also have a how to video page on fixing exercise equipment for do it yourselfers. I don't have this video yet, so maybe I'll have to make one.
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I don't think it's the speed sensor or The elevation Motor.
Speed sensors normally tell you to pedal or pedal faster. The speed sensor turns on the upper electronics. If you read the error 30, then the speed sensor is working.It turned on the electronics. You may have confused the electronics and that is why you got no speed or resistance.
If you have a faulty cable, when you touch it it may make contact for a while then jiggle loose, loosing the connection. Get a 7' internet lan
cable. Remove the hood and upper display. Plug the new cable into the
upper board and lower board. Get it out of harms way then test the machine.
Elevation motors normally, Jam, get noisy, go past upper or lower limit switches, or have bad elevation sensors.
In my experience error 30's were normally an electronic board
Look at the error 30 code description below to get a better understanding.
Errors 30 through 33 all indicate the loss of communications or erratic communications between the microprocessors in the upper PCA and the lower PCA. The trouble shooting procedures for all of the are essentially the same. Error 30 is defined as upper PCA not receiving from lower PCA. Error 31 is defined as faulty data received from lower PCA. Error 32 is defined as lower PCA not receiving from upper PCA. Error 33 is defined as faulty data received from upper PCA Possible Causes
1.An upper PCA to lower PCA interconnect cable is bad.
2.The interconnect cable at the upper PCA was mistakenly plugged into the CSAFE connector.
3.A 5.17 EFX equipped with version 1.01 upper and lower software.
4.Mismatched upper and lower software.
5.+5VDC power supply is being overloaded by another component that is plugged onto the PCA.
6.A defective lower PCA.
7.A defective upper PCA.
Possible Remedies
1.
Substitute a know good interconnect cable between the upper and lower PCA’s to determine if the interconnect cable is defective.
2.
Remove the interconnect cable from the CSAFE connector and insert it in the correct upper PCA connector.
3.
Replace the 5.17 upper and lower software with the most current software versions.
4.
If only one of the upper or lower software is version 1.01, replace the version 1.01 software with the most current version of software.
5.
Unplug all components from upper and lower PCA’s leaving only the upper PCA, lower PCA, data cable, and the AC power going to the lower PCA. If the unit shows any other error instead of the error-3x, plug components in one at a time (cycle power when doing this) until the error-3x returns. Whatever component that caused the error-3x to return when plugged in IS the cause of the error.
6.
Substitute a known good lower PCA to determine if the lower PCA is defective.
7.
Substitute a known good upper PCA determine if the upper PCA’s defective.
Good luck I hope this will help.
You can also email me at
markepeterson@austin.rr.com 
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