20 Most Recent Bosch PowerStar AE115 Tankless Water Heater... - Page 9 Questions & Answers

I believe this is a hydro-sparker pilot ignition then burner on when T-Couple/Flame Sensor acknowledges pilot lit.
W/O the signal feedback the Gas Valve will not open and light burner.
This is a Technician Service Job as you have insufficient knowledge to DIY this potentially dangerous LP/NG Control Valve/Sparker Assembly
I assume that lack of knowledge by your lack of a Manual for the Unit
You cannot force ignition on a hydro-sparker manually.

Bosch Water... | Answered on Sep 12, 2014


Maintaining your tankless water heater

Have both your water heater and water softener serviced every year. If you do not have a water softener please use Aqua Pures AP 430 SS and replace the cartridge at least every 6 months.

on Jun 30, 2014 | Bosch Water Heaters

Your primary fan has a circuit board on it. If the leak splashed on the fan, the fan probably needs to be replaced.

Bosch Water... | Answered on May 06, 2014

Try descaling the heat exchanger, and also clearing the fins of any soot that has formed

Bosch Water... | Answered on May 06, 2014

Clean your orfice...it sits at the bottom of your pilot burner, where the brass pilot tube screws in to. Its a small stamped piece of stainless, about the size of a pencil eraser. You can also buy new ones online for only a couple bucks

Bosch Water... | Answered on May 06, 2014

E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Bosch Water... | Answered on May 06, 2014

Watervalve needs to be replaced....part number is 87070063440, and can be found online.
Its only held in by the water connections and 2 Phillips head set screws(about 1 inch apart) directly underneath the junction of the plastic watervalve and the grey metal gas valve

Bosch Water... | Answered on May 06, 2014

Triac devices are not restive. They are like back to back SCRs. Once gated they will not turn off until the power crosses zero. It will do that 50 or 60 times a second then needed to be re-gated.

Bosch Water... | Answered on May 03, 2014

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