Question about Bosch & Tankless LP Hot Water Heater

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Pilot not light

When trying to ignite electric pilot for hot water tank pilot does not spark so that flame does not ignite hot water tank

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Steven Foerst

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  • 52 Answers

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!

Posted on May 18, 2014

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5 Related Answers

Anonymous

  • 1 Answer

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.

Posted on Apr 22, 2009

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co7196

Ned C Cook

  • 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

Randy Hough

  • 2559 Answers

SOURCE: Bosch TF250 hot water service

Replace the flame sensor.

Posted on May 11, 2009

gary1121

gary miller

  • 332 Answers

SOURCE: bosch hot water service 16p burner shuts down

a tankleess water heater doen's have a piliot? but check the vent outside make sure nothing is blocking it, if it detects the exhaust thru the cold air intake it will shut off and over heat, other then that it would have to be the control board

Posted on Jun 06, 2009

KenjiFox

Kenji Fox

  • 142 Answers

SOURCE: bosch aquastar Aq125-hx does not

That particular tankless water heater has hydro-generated ignition. In order for it to function, it requires a certain water pressure and velocity. You can try turning on the hot water in two location in your house to see if that gets it started. If it does, try getting a higher flow shower head, or removing the limiters in your faucets.

Posted on Jan 07, 2011

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1 Answer

Have suburban water heater sw6de when using lp gas the heater will ignite & heat tank the tank will not re-ignite when required it works on electric i replaced the module board no fix any thoughts?


most gas systems use a pilot light ti ignite the gas that is controlled by a solenoid valve
check to see if the pilot light remains lit all of the time or if it is extinguished
it may be that the solenoid valve is not passing gas as required from the controls or the pilot light is going out and the optic sensor is not seeing flame so it turns the gas off
In any case it is not a job for DIY so get in a gas fitter to fix the fault

Jun 27, 2018 | Water Water Heaters

1 Answer

When trying to ignite electric pilot light, when pushing button to ignite, pilot doesnt spark to create flame


Pull out sparking rod and lightly polish with fine steel wool. then put back together. Could be in control box but I doubt it. You will probably see mild corrosion on rod.

Apr 02, 2014 | State Water Heaters 50 Gallon Select SL...

1 Answer

Sometimes it doesn't light at all other times during use the hot water goes off and the box keeps flashing green as it continues to spark


it sounds like the flame sensor is dirty or faulty. when the pilot lights the flame sensor rod recognises the flame to allow the main gas valve to open and ignite the burners. you can clean the flame sensor with some steel wool or sandcloth

Dec 29, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have atwood pilot relight model gc6aa-8 pilot will light but after tank heats up & there is no call for hot water,pilot is out and very hard sometimes impossible to relight.


So are you saying that the first initial lighting of the pilot, without turning to on, works o.k., good flame etc, ? If not sure, try lighting pilot only, and leave setting at pilot only, and see if it's a good flame, and get back to me.

May 25, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

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.

May 05, 2009 | Bosch & Tankless LP Hot Water Heater

2 Answers

Bosch water wizard 600 pilot light out


First check your gas supply, gas in bottle or lines? I know, this is basic & I'm not having a shot at you, but you'd be surprised at how many times it gets overlooked.

If you do still have gas supply, evident by that low hiss when you hold the pilot feeder button in (you might have to lean in close to hear it), then you need to check that the piezo is working. This is the bit which produces the spark to ignite your pilot. You will be able to see it sparking at the pilot outlet when you push the button (if you're looking in the right spot).

Ok, you have gas & a working spark? Not sure which buttons to press?

You mentioned the manual no longer being in a helpful condition...do you know which of the 4 buttons, 2 taps, 1 slide control & 1 dial do what?
Well just in case, here we go in simple form... first button on the left is the pilot feeder (lets gas through the pilot), second button from the left is the 'ON' button, third from left is the 'OFF' button & the fourth from the left is the piezo ignite button (gives you that much needed spark!). The slide controls your flame (how much gas gets fed to it). The dial, below the pushbuttons & slide, controls how much water flows through the system which then helps regulate the heat. Make sure the taps on your gas & water lines to the unit are on. There you go...2 taps = gas & water supply, 4 buttons = pilot gas, on, off, piezo (spark), 1 slider = gas/flame control, 1 dial = water flow control.

Ok let's see if we can light it! Water & gas supply turned on, slider set about 25% from left, dial set roughly in the middle, push in button 1 (1st from left) & hold in for about 10 seconds, you should hear a very faint hiss from pilot area. Yes? OK, keep holding button 1 in & press & release button 4 several times until pilot lights, you may not see a difference but if you can't see it and it does light you will hear the faint hiss change to a soft fluttering sound as the flame consumes the gas. Still OK? if so then the next step is to push in button 2 quite firmly & then release button1 as well. If all works as planned you will shortly have hot water supply restored.

If the above has not worked then your hot water service may just need a service to clean everything up & maybe replace a few worn or excessively corroded parts. Otherwise ,if there are no blockages in supply lines etc, then it may be time to replace it.

You neglected to say how long you've had it.

Cheers, hope this has helped.

Dennis

Feb 18, 2009 | Water Heaters

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