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Follows are the part of the manual
• The cooling fan does not rotate.
• The ambient temperature is too high.
• The vent is blocked up.
• A heat generating device is installed close to the inverter.
• The thermistor in the unit is broken. Remedies
Restart the operation by resetting the
inverter after it has cooled down enough.
• The fan requires replacement if it does
not rotate during operation.
• Secure sufficient space around the
• Do not place any heat generating device
near the inverter..
The E.pu error is a general power stage failure.
Typically means that the unit has a defective power stage that would need to be replaced.
If it is an old inverter(early 2000's) there is a possibility that it could be a cooling fan problem since at that time there was a three wire fan used. May be able to replace the fan (must obtain from KEB) but there may still be problems with power stage. If it is from early 2000's then you might be better off replacing the unit with new current version.
You may have cracked or broken the FL tube (backlight) or the inverter board has failed. If the tube is broken, it needs to be replaced (or you can replace the whole LCD if you find one cheap). If it's the inverter board, look for a microfuse on the inverter board (the one connected to the FL tube). These fuses will sometimes go for no reason. Check it for continuity with an ohm meter. If the fuse is good, you may need to get the inverter board replaced.
To find out if you damaged the fl tube, you have to open up the LCD panel. This is not a job for the faint of heart, and you have to be really careful not to damage anything. They usually shatter when they break too, so be careful there. You may just want to tap the backlight area to see if you hear rattling glass.
Check for loose or dislodged cables while you're in there.
The fan can be replaced. It is very similar to some of the PC cooling fans. I've got the same problem (again) and will be replacing it soon. I will give you the fan specs once I remove my fan ( I think it is 4" 120VAC - will let you know when I repair mine).
Inverters use high power transistors to create an A/C voltage from a D/C input. These transistors are the common point of failure when the units are not cooled properly or used beyond their rated capacity. (Actually, you should always buy an inverter that’s rating for continuous use is well below what your actual need is). What’s most likely happened is that these have shorted out and need to be replaced. Unfortunately, replacement parts alone will likely cost nearly what a new unit costs.
Sorry to be the bearer of bad news; but you basically have a nice paperweight with some pretty lights and fans on it.