Not sure about modern heaters with lots of lights but inside there is usually a pressure switch that prevents operation if the water pressure falls and a temperature switch that cuts the power if the temperature rises too high - in a single heat unit there are only two wires supplying the heater element and the temperature is controlled by the water flow. It is straightforward to use an ohmmeter to check the element but with a multi-heat unit there is likely to be a switch to contend with and several connections to the heating element.
In this case it is a good idea to draw out the circuit so it makes more sense - if the element tests ok, it is likely one or the other of the safety switches is faulty.
SOURCE: Bosch 125 Tankless Water Heater - Water not hot enough
Sounds more like the venturi in the watervalve of the tankless water heater is clogged. I would recommed rebuilding it and paying close attention to properly relubing the pushrod and cleaning the venturi.
SOURCE: Tankless water heater pilot light will not stay on
It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.
SOURCE: Titan Tankless stopped working this morning.
I have the Titan SCR2 N-120. You may have a different model. On mine if you are looking at it just a inch below & 1 inch to the left of dead center will be a round black sticker(it has some white lines at&t's logo). there's a pin hole in the middle of the sticker that you can poke to reset. Or turn the breaker off then take the 2 screws out of the top of the unit. It's just a thin metal cover that you can pull back & look inside. You'll see a red circular button thats the reset button. It's right behind where the hole I was talking about & what gets pushed in. you'll also be able to see if anything burned out & can get replacement parts at titanheater.com . One of my heater elements had burn/ melted & I've ordered a replacement. It was $17 + $11 s&h but still cheaper than $200 new unit from e b a y. Best of Luck
SOURCE: I have a noritz water tankless heater and hot
Three flashes typically indicates the unit is overheating due to scale. I'd try a descale initially and see if that remedies the problem.
SOURCE: I have a titan 120
Replace the element it is shorted out.
Testimonial: "I ordered one Monday. Just wanted to make sure I was doing the right thing. Thanks"
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