Top 20 Bosch & Tankless LP Hot Water Heater Questions & Answers

It sounds like a bad flo switch. If not, then the problem is more likely in the mother board. Call Bosch back and ask for a supervisor right away. The peons sometimes are given advancement according to how many calls they handle, so they have a time crunch. Go right to the supervisor. Good luck!

Look for a water temp control on unit. Otherwise a lower temp can be attained by having a higher water flow to minimize temperature buildup in heating coil.

have a plumber check the installation as it appears that there is a temp control mixer in the kitchen line that should be in the bathroom line Many states and countries now have made it mandatory the full uncontrolled hot water cannot be used in a bath, shower, wash basin but has to limited to a max temp of 70 C to prevent burns to the skin

You either have a weak spark from your ignitor which needs replacing, a bad elec connection to the ignitor, or it needs to be repositioned nearer the burner. Check connections and try repositioning it before you install a new on.

http://www.ps2netdrivers.net/parts/bosch.gwh.425.hn/

Stupid me but could you be a little bit literate in asking a question.My dog write better questions that I can understand than this scribbling.A GWH 2400 is the little brother of the GWH 2700 much like the 635ES. If you have an LP model be sure to use the overpressure protection valve supplied by Bosch as overpressure in LP (above 10-14" WC) can completely destroy this unit.And you can use a TPR or PRV for 170,000+BTU being sure you get a House Pressure valve of 60-80-100 PSI+ and not the boiler PRV for 30 PSIBeyond that your questions above states nothing recognizable as a technical question

the igniter probably did this prior to the adjustment if not check manuel if this not a safety back up to prevent gas from not being burned .

Check or replace diaphragm in the water section also clean the filter fitted at the inlet

http://waterheatertimer.org/pdf/Bosch_10P-water-wizard.pdf Gene If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Check gas pressures first especially on low setting. Ensure gas burner is clean get unit serviced if over 2 years old. Check or replace water flow sensor & clean inlet filter.

first time heard of a tankless that is round

Reset Button.....be nice if you gave us a brand/model to go with. If you mean the small GFCI inside the heater, you'll need to get a Tech Service Call and call Mfrs Tech Support as something is short to ground. This can't be done remotely as you have to track currents and voltages and resistances with a multimeter. Tankless usually draw less than 2A even when fully on so doubtful you're overloading a general house circuit. Might even be the small interior GFCI that's bad. That's why you need Tech Support.

It's in the Bochum owners manual page 7

It sounds like there is too much pressure in the hot water pipes. You can try adjusting the pressure. Do it a little at a time to see how much hot water is coming out. The only other thing I can think of is that there is a large delay between the switch and the water flow. meaning you will need to stop the water a while before you actually want the water to stop flowing. Elisa Jed ' http://www.mccreeryhvac.com

Define melts cold line.

need to know what you are resetting

Question is how am I to know what model this is? And as stated the question answers itself.....Plumber removed...did he reinstall? of course but as stated the issue is unanswerable. Does the Pilot light? or if this is an electronic unit than something in the feedback ignition sensor is amuck. Is this a 125VP, 125B, 125H. 38B or a 240FX, 250SX or 2400/2700 or newer?

Sounds like you have a hydro-generator on this unit. Check the output on the hydro-generator it should be about 1.5V DC. If not clean the inlet screen and check your water pressure. Water pressure less than 30 PSI will cause issues. If you have 1.2V-1.5V DC make sure the power switch is on. If the power switch is on replace the control unit. I sell parts for Bosch units only!

I do not know how old this unit is or what model but many water heaters are not sophisticated enough to measure the temperature, but heat based on water flow and temperature rise. To start, tankless water heaters turn off every time you turn the hot water off. Lets use an example. You use the facilities, wash your hands then turned off the water and take a shower. You will bring the already heated water (from washing your hands) from the pipe up to the shower. Then the cold water that comes into the pipe from the reactivation of the water heater comes up the hot water pipe with warm then hot water just behind. If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor. First, check the temperature of the water from the heater. If it is too hot and you are mixing too much cold water in, the unit will turn off because there is not enough water flow to keep it running. Second, turn off the valve at the water heater and turn on the hot water at a faucet. If the water does not stop running, there is a "plumbing cross over" usually caused by a failing pressure balance valve in a shower. Third, if the unit has not been serviced, go to bosch-climate.us to find a tankless water heating professional in your area. Totally Tankless LLC

pilot fault not giving enough power to thermal couple or replace thermal couple