Question about Bosch 2700ES Natural Gas AquaStar AquaStar 2700ES Tankless Water Heat

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Bosch 2700es natural gas unit keeps going out requiring a relight

I have 2 units. one works fine and the other keeps going out. I have vacummed and cleaned the interior, raised the length of the exhaust pipe and relight the unit 5 times with varying legnths of time it would work. Sometimes two days and sometime 4 weeks. I have a second unit, a fire place and stove top further down the gas line that work flawlessly. Any suggestions or service outlet in the Baton Rouge, La. area?

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Actually, this comment if coming from the math building at LSU!!!! How nice.

Any ways......You probably have a faulty thermo couple. It is the easiest and cheapest thing to do so try that. Most units have reverse threads so keep that in mind when removing. It is identified by a copper wire that leads to the main control unit. It should also be held in-place by some clips that just pinch the copper in place. Replacing the new one will be just the reverse of the removal.

Hope this helps

Posted on Apr 16, 2009

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1 Answer

We are getting A7 error on Bosch 2700ES. Is our water too cold going in? We are in on well water system in Alaska. Do you have any solutions on how to get it to come back on?


Here is the A7 code for this heater:

Outlet temperature sensor fault

(Temperature below freezing or

above 210°F).

1. Check red wire connections at hot water temperature sensor.

Clean terminals with an eraser. If badly corroded, replace sensor

and wire harness. See Fig. 65, page 48.

2. Sensor may trip if water temperature drops below freezing to

protect heater from freezing conditions. Any damage due to

freezing conditions is not covered under warranty.

3. Clean inlet filter screen and clear any debris out of shower

heads, faucet aerators and whole house filters.

4. In areas where water has a high mineral content, periodic
descaling may be necessary.

I would be very surprised if your water temp is below freezing, even in Alaska, check it with a thermometer. Well water is usually around 45 degrees F.
Let me know,
Gary

Dec 22, 2010 | Bosch 2700ES-NG Natural Gas Tankless Water...

1 Answer

Water temp. at the tap fluctuates


It is likely the inlet filter is plugged. this reduces the flow and then the heater adjusts the burn rate down to protect itself. the filter screens are small and plug easily. It would be a good idea to install a larger pre filter on these heaters.

May 30, 2010 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Pilot light will not stay on Bosch natural gas tankless water hea


Check to make sure the flame of the pilot is hitting the thermocoupling. If not then you can use compressed air to clean the pilot port and relight and check again. If the flame is hitting the thermocouple, then it may need to be replaced.

May 05, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

I have the 2700es and the water upstairs gos hot then cold ,hot then cold and so on , what sould i be looking at?


The water temperature may be set too high, or try turning the hot water off and opening a hot water tap. If the water is still flowing out the hot water tap, there is a problem with a faucet (likely a shower valve). It could also be water pressure below 30 psi.

Mar 28, 2010 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Upsstair shower doesn't supply continuous hot water, downstair works great. Water pressure problem?


It could be a water pressure problem but most water supply companies put out enough pressure for a 2 story house (or even 4 stories) easily. Can you clarify what you mean by continuous? Does the water get cold, on and off (i.e. no hot water) or does it vary in temperature mildly?

Mar 12, 2010 | Bosch 2700ES Natural Gas AquaStar ...

2 Answers

My old Aquastar tankless natural gas water heater used 1/2" gas line. My new Bosch 2700ES -NG says it requires no less than 3/4" inside diameter gas line. Do I have to replace all the gas supply lines...


None !!
3/4 pipe from gas meter or regulator. At low pressure there may not be enough gas flow through a smaller pipe for the boiler when on full bore.
The boiler input pipe will be 1/2" needing a reduction from 3/4 so there is some leeway.
I have about 8' of 1/2 pipe on mine [Bosch Worcester] from the reg. and it is ok.
You could use the existing 1/2 and try. No harm done if insufficient-just replace. If you have some other gas takeoff on the same line a 3/4 pipe up to that take off is most likely.

Jan 29, 2010 | Bosch 2700ES Natural Gas AquaStar ...

2 Answers

Water runs hot then cold then hot during showers


YOU MAY HAVE TO DESCALE YOUR UNIT I have this problem along with a bunch of error codes. Please don"t call the Bosch 888 number. They want to speak to a tech. In addition, their off during the weekend. Tankless water heaters are great when thier working. Mine is not.

Oct 17, 2009 | Bosch 2700ES-NG Natural Gas Tankless Water...

1 Answer

We hzve natural gas ion oujr cabin but no electricity. Does Bosch 1000P NG require electricity? My plumber says electricithy is required. I need a DEFINITIVE answer. Thanks


LOOK AT THE UNIT WHERE THE GAS GOES INTO THE UNIT IF YOU SEE SOME KIND OF A SPARK PLUG WIRE YES YOU WILL NEED ELECTRIC FOR THE UNIT TO FIRE, MOST OF THE UNITS HAVE WHAT THEY CALL A STANDING PILOT LIGHT WHICH STAYS LIT TO IGNITE THE GAS WHEN NEEDED. LOOK AT THE UNIT FOR INFO FOR VOLTAGE THERE HAS TO BE SOME KIND OF TAG FOR THIS TO COMPLIANT FOR SALE OF THE UNIT

Sep 23, 2009 | Bosch 1000P NG AquaStar 2.6 GPM Indoor...

1 Answer

Seven months ago, a bosch alled at my house


you will always have this problem in city type of appltcations.there is too much of a flow differation.

Jul 13, 2009 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Bosch AquaStar 2700ES NG - C7 error


Hope this helps. Be careful of electrical shock!
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2700ESTechSupport/Troubleshooting/tabid/1288/Default.aspx
Copy and paste in URL:/Location bar

Jan 30, 2009 | Bosch 2700ES Natural Gas AquaStar ...

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