My omega tankless water heater is constantly giving error code E2. This stands for incomplete burning. It will work sometimes but takes several times of turning water on and off to get it to finally work. Could this be the gas line is not large enough or is it a part that needs replaced.
E2 error is given when the ION sensor is coated with the sulphur in the NG or LPG (the agent which make the gas stink so you can detect the licks!
Need to use a 400 to 600 grit sand paper and properly clean the sensor until it shine ! It take about 15 minute and last another 2-3 years until coated again .
You have same problem in Bosh (same cod) and in Reem (different cod!) It does not have anything to do with the unit, it strictly has to do with the gas composition.
I post also a uTube video about this.
I had my 620 for 2 years then the Error E2. I took it to work, opened it up and blew out the cumbustion chamber area. The ammount of corrosion that was blocking the path was tremendious. When I re installed..... Solved. NOW another year later, e5 , over heating....while NOT running. Unplug it , plugit back in, instant E5 with or with out water running. I'll spend my money else where next time. ASSEMBLED in USA, not made.
Take the cover off and remove the two screws that attach the circuit control board and keep the unit unplugged for 15 minutes then reattach the screws and cover then back flush the unit with vinegar for 45 minutes to remove the calcium then put the unit back online and it should work.
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It sounds like your flu pipe may be clogged,, they just snap together or have little screws holding them together,, take the sections apart and make sure nothing is is the line reinstall and try it out
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