I have a PowerStar tankless electric water heater, model #44-557710 and it was replaced about 3 months ago. This morning I had hot water and this afternoon I do not. When I call for hot water a red light flashes on the front of the unit. It doesn't say what it is for. Any help?

Turn circuit breakers fully off and then back on.
Use nose to smell for burning inside main panel.
Make sure you are getting 240Volt and not just 120V from one leg of the breaker.
Do stress test on breaker panel.
http://waterheatertimer.org/Troubleshoot-household-electricity.html#stress

Least expensive solution: Replace tankless computer for $285 buying tank-type electric water heater from local box store.

If tankless computer is new, then call installer.
If you installed it yourself, call professional installer.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Turn of leave for 2 minits then try again

This is a "point of service" tankless water heater that was manufactured by BOSCH. BOSCH is now Bosch-Climate.us. Technical support is available at 866-330-2729. P.S. check this site: http://tanklesswaterheaterz.com/bosch-ae-9-5-powerstar-1-5-gpm-point-of-use-indoor-tankless-electric-water-heater-reviews/

There are a lot of other things that eat electricity. Like space heater and using ovens for heat. Heat pump.Central heat fan running all the time. House lights left on. Outside flood lights. Clothes washer using HOT water. Look around real good. It all adds up. Also the power co. may be charging more for "fuel" costs surcharges. Here in GA I'm paying a bit more now to pay for a nuclear power plant.

try bleeding that section of pipe. or the whole system if not.

how is heating element ? Wasit on with no water running thru it. Does it have a reset?

Ok, sounds like a flow sensor issue, is your house water pressure steady or does it fluctuate? The sensors on these seem to be a common issue and this model has many issues with heating. take care

That is a single phase hot water heater. Hope this helps

Hi Is this powerstar AE115 a tankless water heater? I suspect the 115 designator in the model number means it runs on 115 volts. And what is the second Tank ? Storage or an electric water heater? Both should be rapped with insulation to hold the heat. Meaning storage or electric water. Don't rap a tankless water heater. At the very least get a licensed electricen in to make sure you electrical service will support a 240 volt system. If it can , do it. Think of electricity as a river flowing. Volts are the speed the water flows. Amps are the force ( Also caled Impedeance) that push the water.( And spin your meter like a top I might add.) And resistance as how many bolders, Rocks, Old fords that are in the river bed slowing down the flow of water.Now here is where OMES LAW comes in. E= I x R. (E) volts is equel to the (I) impedeance (Amps) multiplied by the ( R) resistance. You can spin this in a clockwise direction and find the net value by dividing one from the other to get the net. ( I = R * E ) If This is true ( and it is ) if we double the voltage (current) we can realise a reduction on the Impedeance (Amps) of up to 1/2 of its current value.In other words if you were useing 100 amps @115v you will use 50 amps @240v Depending on the resistance. Sorry but I forget the voltage drop on 100 feet of copper wire but I assure you its real low.But your best bet would be to use a tankless water heater core in you boiler that you use for heat if you got one and save the electric for summer mode.