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2nd Heating Unit does not come on automatically have to push reset button. Have replacedThermal Cutout (LOC4004, also Heater Assembly (LOC 4035) and Control Board LOC 4030. Where is signal breakdown occurring ?

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Posted on Jan 02, 2017

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gary1121

gary miller

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SOURCE: Bosch 2400E EC code

it sounds more like the gas valve, you can taje the numbers off of it call or e-mail the compant and buy a new one,,, the thermal coupling keeps the piliot lit but i don't get it RECONDITIONED, I have been doing plumbing for 34 years now and to get a water heater thats reconditioned it would probobly be cheaper to buy a new water heater with this kind of problem good luck

Posted on Jun 06, 2009

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Water heater blinks 7 times. I don't get any hot water. Model # is MITW4056FBN


Hope this helps..I have also attached a link that may be useful.

No Hot Water
REASON REMEDY No power Check fuses or circuit breaker, replace or reset. Check with utility if necessary Wrong wiring connections at heater terminal Correct according to manufacturer's instructions Leaks around heating elements (1) Tighten element (2) If necessary, clean and replace with new gasket Loose wiring connection Locate loose connections. Clean carefully (remove all oxidation). Reconnect properly Lightning Inspect: (1) fuse (or circuit breaker). (2) Heater elements, and (3) thermostat, replace if necessary, see "grounding instructions" below High voltage Check utility for correction Short Locate short circuit and correct Wrong piping connections Reconnect pipes to proper fittings according to manufacturer's instructions Undersize service wiring Check with utility co. or electrician Improper calibration Replace thermostat Faulty thermostat Replace Faulty thermal cutout Replace Open thermal cutout Reset Top heating element burned out Replace
http://www.bradfordwhite.com/sites/default/files/product_literature/48494-A.pdf

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How do I start a 1973 komfort travel trailer water heater?


See if big red knob has a PILOT or LIGHT setting and put it on that setting. Next look at knob on bottom-- it should have a circle cutout on it that needs to align with the pilot push button. The cutout lets the button be pushed in. While holding button in---light the pilot and keep holding the button in for about 3 minutes. If everything is working right with the water heater, after 3 minutes or so you can let go of the button and the pilot should remain on. If it stays on. turn the smaller button to the run or heat position and the big burner should come on. Then set the big heat control knob for the heat setting you want.

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The thermal cutout, on the left side, pops up when water stops flowing through the unit. The modules are Polymer. I can press the button, have tons of hot water as long as the water is flowing through...


The left canister probably has a grounded element in it, which will keep power going after the water is off. Either that or you have a bad triac on your control unit

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The thermal cutout pops on tank two after it shuts off. It boils then shuts off. It also turns off when taking a shower, producing cold water. I checked the ohm readings on the thermal cutout and the...


Question posted under Bosch tankless.
Question says 'tank'
Brand, model, and type heater unknown.
Elements mean electric.
'Thermal cutout pops when taking shower produces cold water' indicates tankless, since tank-type would maintain some hot water.
No error code might indicate tank-type.
Add a comment with type, brand and model number of heater for possible assistance.

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

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I have a powerstar ae115 water heater that is 3 years old. The thermal cutout onthe left side keeps tripping. after shutting off the shower the temp on the top of the unit is reaching 185*f. I have...


You've done the required first-step troubleshooting and maintenance.
If thermal cutout keeps tripping, and unit is actually reaching 185, then something is wrong with wiring, temperature sensor, gas valve, or PC board. Or combination of factors.
Call service technician, and open following link for some Bosch tankless resources including Bosch contact information:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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1 Answer

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First a question. Did you fill the water heater until water ran freely at the hot taps.
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I had the same problem with the Stiebel Eltron Tempura 24. Right side unit worked (with blinking LED), but the display and left side (including LED) did not work.

This is CRITICAL. Do not take the cover off unless you have turned off circuit breakers at the circuit breaker panel AND tested that there is no power. There is a lot of voltage/ampreage here and it could be life threatening if you get shocked. Call an electrician (or a plumber) if you don't know what you are doing.

My problem was solved by resetting the safety thermal cutout switch on top of the non working unit (red single press thermistor). See this manual http://www.stiebel-eltron-usa.com/pdf/install_tempra.pdf page 8.

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