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Need to know what a E4 reading on the runyes autoclave means

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E4 error is a pressure and temperature differential. Check the steam generator solenoid,steam generator water pump and water sensor in clean water reservoir. If any of these components are faulty then replace. If all ok refer to E2 error and check inner temperature sensor or check for steam leaks

Posted on Sep 15, 2010

  • Steam Swami Nov 10, 2010

    What E4 means is that, unfortunately you bought one of the worst autoclaves on the market in the world.. No proper door lock, superheated steam, lousy temp control. Chuck it



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Oh no, you have bought a "Runyes" Chinese unit. "Run - Yes" is the best option. Sell it & buy something better.
But, E4 is to do with Temp or Pressure not right.

Code E4:constant temperature and constant pressure failed.

(the chamber pressure tolerance is greater than 0.25bar or temperature tolerance greater than 2.5?)


A. please check if you can open the solenoid valve which the steam gets into.

B. please refer to E2 process
For E2 try:

Code E2:Chamber overpressure

(The chamber pressure is above 2.4 bar for longer than 2 seconds)


A. Please check when the pressure rises, the chamber inner temperature will also rise up. If not or rise up very slowly, then you should check the inner temperature sensor, please refer to E1-C1 process.

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C. During the machine normally working cycle, please observe if the machine vacuum could be lower than -0.6 bar, even lower than -0.7 bar if the machine is still cold.

D. Adjust the chamber cover and tighten a little if necessary.

E. When you run a cycle for the first time with a packed or non packed instruments and it comes up with E2, please don't worry. It will not come out with the E2 alarm again when you run it the second time.

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