Question about Bosch 1600H-LP Liquid Propane AquaStar AquaStar Liquid Propane Tankless Water Heater

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Bosch 1600 h not lighting pilot light

Water flow but not pilot light ignition. is hydro generator the problem?

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  • Contributor
  • 33 Answers

If your getting a spark the generator should be ok I would clean the pilot injector and re try

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

kevin000
  • 1847 Answers

SOURCE: Bosch tankless GWH 1600 H NG won't always ignite

The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

Posted on Mar 29, 2009

co7196
  • 3433 Answers

SOURCE: no hot water, pilot light lights but no burner ignition

Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

Posted on May 06, 2009

rockitman187
  • 2559 Answers

SOURCE: Bosch TF250 hot water service

Replace the flame sensor.

Posted on May 11, 2009

mrhotandcold
  • 248 Answers

SOURCE: Have a Bosch tanless water heater. Pilot won't

sounds like blockage pilot jet nipple needs cleaned best of luck

Posted on Oct 24, 2009

mrhotandcold
  • 248 Answers

SOURCE: we have a 3 year old Bosch GWH 425 HN tankless LP

suggest you complain to Borch sometimes lemons get through best of luck

Posted on Oct 30, 2009

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1 Answer

How to light the Bosch TF250 pilot light


I believe this is a hydro-sparker pilot ignition then burner on when T-Couple/Flame Sensor acknowledges pilot lit.
W/O the signal feedback the Gas Valve will not open and light burner.
This is a Technician Service Job as you have insufficient knowledge to DIY this potentially dangerous LP/NG Control Valve/Sparker Assembly
I assume that lack of knowledge by your lack of a Manual for the Unit
You cannot force ignition on a hydro-sparker manually.

Sep 08, 2014 | Bosch Water Heaters

1 Answer

Pilot not light


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!

Apr 02, 2014 | Bosch & Tankless LP Hot Water Heater

1 Answer

Cannot find pilot light on my bosch GWH635ESL, help!


Call Bosch
Gas Products Technical Support: 800-642-3111

That model number is only shown at one website, and that model number is not shown at Bosch.
Open following link for Bosch:
http://www.boschwaterheater.com/BoschHotWatercomHome/GasProducts/tabid/331/Default.aspx
Search of Bosch for that model number shows no result.

Some water heaters do not have a pilot light. Instead they use hot surface igniter rod that glows red hot
The igniter rod ignites the gas after solenoid valve opens and gas flows to combustion chamber.
The igniter rod and heat sensor have to be operational, and have to be positioned correctly for ignition to take place.
If igniter rod is not working, or if heat sensor does not detect flame, then gas solenoid valve shuts down and water heater does not heat water.

Sep 03, 2011 | Bosch Water Heaters AquaStar - Tankless...

1 Answer

I have a bosch system 21e it is, i was told to ignite the pilot light, can you tell me how this is done?


Consult your owners manual.
http://www.bosch.com.au/content/language1/downloads/70R_UserManual1023.pdf
Heres a new one if you don't have or lost yours. You can't, you got bad advice. tankless system don't have a running pilot light. They operate by detecting water flow and then turning on. Many also state on the lighting instructions to NEVER try and manually light the pilot. Try Bosch tech support. Lowes sells Bosch heaters and they might be able to help you get the support number faster. Hope this helps but please don't go sticking a flame inside there.

May 16, 2011 | Bosch & Tankless LP Hot Water Heater

2 Answers

I have a 16h Bosh hydropower hot water heater . The unit suddenly has no spark .I have taken off the little generater cap and thouroughly cleaned it and the internal turbine . With no improvement . All...


sounds like the generator has packed up. check water flow and clean any filters on the water line. you will need a service agent to check milli volts on generator and power pack

Dec 15, 2010 | Bosch 1600H-LP Liquid Propane AquaStar...

1 Answer

I can not get the unit to light.


Make sure the window is big enough. Ok, not funny. Turn the gas on and leave set for 24 hours Light the pilot light and make sure the thermocoupler is at the tip of the flame. hold pilot until the coupler bulb is nice and hot , release the pilot button nice and slow. If the pilot goes out, The thermocoupler is defective. If this sneaking up on it works, then fire up the main burner. Letting the unit sit under the gas pressure for24allows a thorough purging of the main valve. and saturation of any air pockets. Lighting one in cool temperatures is somtimes difficult becase the gas is heavier or more dense than under warm conditions. Sounds dumb, I know. But give it a try and let me know how it goes.Good Luck, Ned

Aug 27, 2009 | Bosch AquaStar 1600P-LP 1600P Liquid...

1 Answer

Bosch tankless GWH 1600 H NG won't always ignite. The igniter sparks, but doesn't always light the gas. It just clicks. When installed it lit every time, now it takes more and more tries to get it to...


The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

Mar 29, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

No hot water


Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

Mar 01, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

8 Answers

Bosch tankless GWH 1600 H NG won't always ignite. The igniter sparks, but doesn't always light the gas. It just clicks. When installed it lit every time, now it takes more and more tries to get it to...


The clicking is a good sign. What are you trying that not working? How is the water flow-is it strong? 1) Turn the flow control button all the way to your left - this will increase the flow.
2) Pull the relief valve to simulate water flow and listen for clicking sound, and hopefully, main burner ignition. ( if installed in basement or kindly use bucket to catch water) The 1600 H NG will automatically shut off firing after 5sec of clicking.
3) How is the venting-use a household digital carbon monoxoide detector to measure any backspill from chimney.
4) Was the gas line disconnected in anyway after heater was installed? Air in the gas line will cause the igniter to click but no gas to fired the main burner.

Todate i have installed 11 Bosch Tankless Heaters -- 9(125 NG) Which is the same as 1600 Series
1(1600H NG) and 1(1600P NG)
Guess which one I having problem with- You guess it, however, the problem is their electrical wiring.

BE CAREFUL IN CALLNG BOSCH TECH. FOR SUPPORT. THE ARE GRILLING YOU TO FIND A LOOPHOLE WITH YOUR INSTALLATION TO RELIEF THEMSELF OF THEIR WARRANTY.

Jan 25, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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