Question about Bosch AquaStar 125FXKIT-LP 125FX Liquid Propane Gas Tankless Water Heater w/ Hood

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Turn on water the electronic ignition not coming on

It seems that when the temperature outside gets below freezing I start to have problems with the electrinc ignition not igniting. Is it becuase o fthe cold water coming through or the propane?

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The tankless water heaters require larger gas supply lines because of the on-demand consumption. While I don't know your units rating, most Propane Tankless Waterheaters require 2" supply lines. Moreover, pressure is directly related to temperature which sounds like your problem entirely; consider the run of the gas pipe from the tank and the ambient temperature. Now you see why plumbing is a hard profession to fake... =)

Posted on Nov 28, 2008

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Posted on Jan 02, 2017

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Power out for 48 hours, tankless water heater located outside of house, temperature around 20 degrees, no hot water coming out of tap, where do i begin?


First, I don't even want to know why someone would put a tankless outside as you have found out...really bad idea. In order to help you, more information is needed. Is this a gas or electric unit? Or a gas unit with electric controls? Is it mechanically or electronically controlled ( a make and model would help). Are the water lines to or from the tank exposed? When you say no hot water coming from the tap does that mean when you turn on the hot water faucet you just get cold water or no water?

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How do I leave the water heater when I go away for the winter


if you leave the heating on low to stop freezing is fine . Not sure how you water works but I would leave it on to stop freezing Also get some one to pop in once a week to check things are ok .

Mar 19, 2017 | Beretta Water Heaters

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Error code e2. inlet water temp sensor. any one have to fix this?


Before calling service technician, open following link for Bosch troubleshooting resources, including error codes, manual, Bosch contact info, and service bulletins.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are starting point for troubleshoot.
e2 is cold water temperature sensor fault.
Bosch error code says: 1) Check connector on wires coming from top of water valve for a secure connection.
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.

Another contributing cause can be temperature thermostat set very high and tankless sensor is going bad, and very cold incoming water, or combination of factors above.

Also read manual for advisories and required maintenance. Some units require water filter be cleaned monthly.

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May 28, 2011 | Bosch AquaStar 2400ES-NG

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Getting an A7 error code and no hot water


1) BOSCH error code A7: Outlet temperature sensor fault (Temperature below freezing or above 210?F).
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
a. Check red wire connections at hot water temperature sensor. Clean terminals with an eraser. If badly corroded, replace sensor and wire harness. (See Fig. 63, page 46 in manual).
b. 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.
c. Clean inlet filter screen and clear any debris out of shower heads, faucet aerators and whole house filters.
d. In areas where water has a high mineral content, periodic descaling (de-liming) may be necessary.

2) Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

3) Bosch problems at Fixya:
http://www.fixya.com/support/p949576-bosch_1600h_lp_liquid_propane_aquastar_a/solutions

4) Read manual cover to cover
and make sure maintenance is scheduled.
For example de-liming is recommended each year.
Utube search de-lime tankless water heater

Add a comment for more free help.
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For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 10, 2011 | Bosch AquaStar 2400ES-NG

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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

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