I have a massimo pulse ox machine. It was working fine then it had a loud noise and it’s keeps showing Err 1 on the display. The probe won’t come on I have tried new cords and that doesn’t work.

SOURCE: Monitor makes loud screeching vacuum sound; no screen display..?

check to make sure that there arent any magnets near or around it

SOURCE: F30 ERR message on Frigidaire Professional Series Range

I am a tech and just had this happen to me, so I can feel your frustration. I have replaced the temp probe, erc, and still had the problem.
Open the back, with the unit unplugged. On the lower right hand side there is a relay, beside the relay there is a "safety T-stat" disconnect from the circuit by removing one wire and read for continuity. If none is detected, replace t-stat and voila... stove works. Much cheaper than erc and probe...

SOURCE: The CD Changer will not work and shows ERR 1 and I

The cd changer internal mechanism is faulty, replace the cd changer itself.

SOURCE: I've got a faema E91/A 3 group espresso machine.

the original cord how many wire have? on the label what writes? if you have 5 wire (blue= null or neutral, green whit yelo= grounding, brown, black and grey= phases, is posible to have a red wire instead of grey, black or brown wire), on the blue wire whit one of the phases must have 220 V, on the brown whit another phase you must have 380V, if you had a bad conection is posible to damage something in electronic automatisation of the espresso machine, that machine must be conected in a water suply whitin a softner an befor use is posible to must be triggered manually. by the way, this machine must be proper instaled by a specilised personell beacause it is the risc of electric injuri and other bad things. your E1 is posible to be a temperature probe damaged or because of water mising and in 20-30 min. the machine was reaced a high temperature and safety thermostat has occurred. the best you can do is to call a repairman to solve this, if you try to repair your self it is posible to make worst.

SOURCE: my tc 3000 makes a loud noise and I get an err l5

not sure about the loud noise but my issue with the l5 error was a simple adjustment to the speed sensor.. take of the left and rear covers, then look for the sensor that goes into the red grommet attached by 2 wires. slide a business card in between the wheel and the red grommet.. then make sure the speed sensor is pushed all the way against the card and then remove the card. that solved mine :)