There is an open circuit on one of the heater elements. I'm a little disappointed for a product billed as "built to last". The entire CE05 unit on my AE115 must now be replaced after less than three years of use. The house has not even been occupied that entire time. I need to find out how to get the part soon, so the lady and the four youngf children living there can have hot water.

SOURCE: Bosch tankless GWH 1600 H NG won't always ignite

The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

SOURCE: Electronic water heater burner often won't light tho pilot's on

it sounds like you pilot lite is to far away from the burner, make sure that the burner is sitting in it;s purch, look thru the site glass it can be moved by hitting or bumping into the out side of the gas tubes on the outside of water heater, if not, the burner assembly may have soot on it. you might also want to make sure the filters are not clogged on the shut offs that will give it less pressure then it needs to make the unit come on,, write me , [email protected]

SOURCE: Rheem 21V40S-2 does not heat water

all brands and models have a flow switch which protects the heat exchanger from overheating, a very common problem is calcium build up in the heat exchanger which reduces flow and causes the flow switch to shut off the burner. Can be fixed by descaling the heat exchanger. We have a kit available at heaterup.com its safe and easy to use.

Steven Foerst

• 52 Answers
• Posted on Apr 12, 2010

SOURCE: aquastar 125b ng: after 2 years of use water is not hot enough

Sounds like hard water. Service the water valve. Parts are available from your local Bosch Service Provider (Contact Bosch if you don't know who the service provider is).

SOURCE: I have a Powerstar Electric

Tankless heater are a little frustrating sometimes but this is generally an issue of waterflow I believe. The fluctuations are do probably to the amount of water and rate of water going through the heater. If you have a shut off valve on the cold side of the heater, shut it back about half way. This will slow the water going through the heater and allow the heater to heat it up more efficiently. Then go to the shower, turn the hot on all the way (no cold) and allow it to heat up. Once it has heated up, test it by hand for a good temperature that you like. If it is too hot, turn the cold on just a bit until it comes to the temp you like. If it is too cold turn the hot down just a little (still no cold) and it will warm up. Ideally you should be able to turn the hot on full blast and then just turn on a little cold to get the right temp. Once you learn how these work then it makes it easier. You really cant run the water like you do with conventional hot water systems and expect to get the same results. Also, wanted to give you another little tip. Every 6 mos to a year, you should flush you heater with vinegar for about 30-45 minutes using a small cheap submerible pump like for a water feature in a garde. Just put in a bucket of vinegar and and run a hose to the "in" side of the heater and another from the "out' side of the heater and then back into the bucket. This will circulate the vinegar inside the heater and clean all the deposits that will DOA your heater. Funny how the manufacturer wont tell you this but these deposits will ruin the connectiosn on the heating elements. You can make your heater last for a long time if you do this.

Testimonial: "Thanks, this info helped me to remember what Bosch Tech support sort of told me 2 yesrs ago. I'll try the vinegar as well. Thanks, again."