Question about Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater...

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The pilot goes off and on and does not light the burner

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I hope you have called Bosch about this and had it resolved by now. But if the pilot light is turning on and not going to fuller burner operation, the unit is not recognizing full flow. Clean the inlet filter screen, service the water valve or clean the flame sensor (the small bar the the pilot light hits) with a dollar bill. If that does not fix the problem, contact a Bosch service provider in your area (# at boschhotwater.com). It could be a problem with a gas solenoid.

Posted on Apr 04, 2010

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Ok make sure u turn everthing thing off then wait 5 min then turn the dail that controls the heat on it to pilot light then turn the gas nob to pilot then ignit it once lit wait a few seconds and turn gas nob to on pisition then turn heat dail to were the arrow is not to a b or c cause the gas is to high it will blow it self out

Posted on Nov 17, 2009

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1 Answer

Junkers manual gas hot water


What are you expecting to happen?

I assume the water heater and water inside it is cold (otherwise you would not be lighting it). You light the pilot. The main burner comes on and the pilot lights it. The main burner should stay on until the tank is hot, When the tank gets hot the main burner should shut off but the pilot stay on. If you draw hot water, cold water will run in and cool the tank. If yu do nothing the tank will eventually just cools off. then the main burner should come back on to reheat the tank.

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Pilot light doesn't stay lit


The thermocouple may have failed. It looks like a copper wire that goes from the gas valve and leads to the pilot light.My first thought is that the pilot light burner is not burning hot enough because its got dust in it or a spider web blocking some of the air it needs to burn hot. If the pilot stays on long enough to bring the main burner on, a dirty main burner lighting rough will cause the pilot to snuff out. To do the actual repair I would suggest that you contact the manufacturer on the internet. Getting up to your elbows in a gas appliance without professional help is asking for dangerous serious trouble. Good luck.

Aug 17, 2013 | Honeywell Water Heaters

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Pilot will stay lit but burner goes out about 1 minute after it lights


Sound like the flame sensor you could scratch around on it and try again.Possibe venting issue

May 14, 2010 | Water Heaters

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Pilot light keeps going out


Either the pilot light orfice is dirty, and you will need to pull it out and clean it, or the thermocouple is bad. If the pilot goes out as soon as you let the button go then it is most likely the thermocouple. If the pilot stays lit for a few days or hours then you will need to clean the pilot orfice, heres how:
1 turn off the gas supply
2 unhook the main burner gas line from the thermostat, this is the line that goes to the burner
3 unhook the pilot supply line it is usually next to the main burner line
4 unhook the thermocouple from the thermostat
5 remove the burner assembly
6 take the orfice out of the pilot line and clean it out by blowing thru it, use an air compressor if needed.
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Apr 08, 2010 | Reliance & 30 Gal LP Gas Water Heater

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After heating pilot goes out . my igniter is bad so i light manually and after heating main burner shuts off and so does pilot


The thermocouple that controls the gas to the pilot light must be bad. The thermocouple, when it is heated by the pilot light keeps a valve open that keeps gas flowing to the the pilot light. This thermocouple closes the valve that supplies gas to the pilot light, this is to prevent gas from continuing to escape when the pilot light goes out. This is a safety issue, I recommend that you call a professional about this problem. You might be able to repair it your self by replacing the thermocouple but I still recommend that you have it checked by a professional.

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The pilot light blows out every time the main burner shuts off. It will light, the main burner comes on, everything seems ok until the main burner shuts off, then the pilot light goes off also as if the...


it's the thermocoupler ( about $20 ) that is bad replace it. if that doesnt do it it is the box with the on/off/ pilot button ( about $175 ) I found a complete unit at www.americanrvcompany.com for $275 plus shipping ($300 total) and that is how i fixed the exact problem with mine.

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The pilot light & will stay lit. untill the burner cycles on/off


MAKE SURE THE BURNER TUBE AND ORIFICES ARE CLEAN. MAKE SURE YOU HAVE THE PROPER LP PRESSURE.

Oct 05, 2009 | RTO Atwood Water Heater - 6 Gal LP

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The pilot light on my gas water heater continually goes out. I can re-light the pilot and get it going. The gas burners goes on runs for awhile. I'm assuming when that when the temp hits the desired temp...


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The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.


  1. Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  2. Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  3. Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  4. Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  5. Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

Jul 09, 2009 | Northern Tool Water Heaters

1 Answer

Water heater pilot light


it also sounds as though the pilot injector could be blocked so when the boiler comes on it extinguishes the pilot & then when the burner goes off boiler shuts down, or also the pilot rate maynot be set right, so when the main burner kicks in it robs the pilot of the gas it requires.
It could be that, or there is lack of ventilation for the boiler, so you get flame lift off when the boiler fires?

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