Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125
EA & EC are telling you that the flame is not covering the flame sensor rod.
Take the front cover off by unscrewing the 2 phillips head screws about 1/2 way down the cover and may be covered by a plastic plate that unsnaps.
Locate the flame inspection glass window near the right side above the control panel. Prepare to observe the flame from start, until the error appears. Visually locate the flame sensor rod: there are 3 rods that pass through the plate below the burner - it is the right most of the 3, angle your head so you can focus on this single rod. Begin water flow by opening a valve or the pressure relief valve that should be outside the cabinet, at the bottom.
Did the flame ignite? it should make several tries before an error.
if it ignited, did the flame cover the flame rod, or did it jump up over it leaving the rod in clear gas below the flames?
In the LCD display, upper right corner, is an indicator in the shape of a flame. It is visably displayed when the flame is covering the flame rod, indicating that the flame is being detected by the electronics. If the flame covered the rod but the indicate is not on, the rod itself may be dirty. Remove it with the other 2 ignitor rods and careful clean the sensor rod with something like steel wool to remove the corrosion. Re-install and test again. If that didn't fix this condition, your control circuit is faulty.
If you find that the flame jumps over the rod and doesn't emerce the rod, check the draft vent pipe for any obstructions, water, bird nest, etc, and any obstruction of the combustion air supply. Check the the gas blower starts up, check for water or white dust in the clear tubing that attaches to the black blower intake from the gas meter.
Otherwise, you will need to follow the procedures to adjust the CO2 and this WILL require a combustion gas analyzer! If you are at an elevation above 2,000 feet, expect to make this adjustment.
Posted on May 08, 2012
EA means your gas flow is not at the right pressure for the heater to work, you need to make sure that you are suppling the right amount of gas to your heater to start.
Posted on Dec 15, 2010
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Posted on Jan 02, 2017
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