How do I get my steamist steam generator to heat above the factory specification of 125 degrees? I would like to have it to 130 degrees.

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There are three things that affect this:
1. Incoming water temp.
2. Incoming water volume.
3.Temp of the device.
There are some other minute things like humitidty and altitude too.

Contact company directly for product manual and help from manufacturer
http://www.steamist.com/contact.htm

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You posted question under Steamist:

Sample Steamist manual says:
"Error messages E4, E5 and E6 indicate a communication problem with the steam generator. If this error occurs, check both ends of the control cable for clean, dry and secure connections.
Dirty contacts can be cleaned with alcohol and a cotton swab or a toothbrush. This can also happen if the control is not sealed and the cable connections get wet."

Error codes change as technology changes, and sample manual may not include your model:
Contact company directly for product manual and troubleshoot help from manufacturer
http://www.steamist.com/contact.htm

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail or phone while you work on Steamist or any do-it-yourself project.
Fixya is always less expensive than a service call.

you should not have to, but if the steamist is not gernerating the right amount of steam then you should put a sofftner on. you will be able to tell because it might have a hard time producing steam, but don't jump the gun right away.

Check the heating elements in that unit . If you have one thats bad it will not produce full steam. Hope that helps..

The heating elements had burned up in the unit therefor creating a dead short on that circuit. Main breakers on homes and buildings are VERY sensitive and will sometimes trip before the smaller branch cicuit breakers will . So the popping you heard was the heating elements breaking down inside the unit it can be some what noisy.

Check the breakers that feed power to the unit--turn off, then on. If no help, remove power from the unit and measure the resistance of the heating element--it should measure somewhere around 20 to 30 ohms, but not infinity. Hope this helps!

That is a main problem with the analog systems. Just not reliable as the new digital systems. To my best knowledge there is only one manufacturer making the 100% digital steam generators.