Question about Bosch AE-7.2 PowerStar 1.2 GPM Point-Of-Use Indoor Tankless Electr

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Flow switch leak

The flow switch on the unit is leaking, Bosch told me that I need to order a new one and none of the parts and labor are covered. Is there a better remedy?

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  • Contributor
  • 41 Answers

Flow Switch is associated with the water flow through the unit.

Posted on Jun 01, 2014

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Bosch 1600h NG not heating water hot enough

it sounds to me like the dip tube has failed. this is a plastic tube that is inside the water heater on the cold side. It is designed to put the incoming cold water at the bottem of the tank allowing heated water out at the top. when this tube deteriorates the cold water mixes at the top of the tank instead of the bottom. a new dip tube is about 5 bucks but must be inserted on the cold side by someone with plumbing experience.

Posted on Jan 09, 2009

mrhotandcold
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SOURCE: I have a Bosch Aquastar 1600 solar tankless water

check filters and increase coldpressure

Posted on Oct 15, 2009

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SOURCE: Bosch Aquastar 2400E LP Does Not Heat Water

Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Posted on Jan 17, 2010

blueextc3221
  • 15935 Answers

SOURCE: I have a Bosch tankless propane water heater

There is likely an onboard relay stuck in the open position.

This is a gas appliance and should be serviced by an authorized BOSCH repair center to avoid potential catastrophe.


Thanks!!
2

Posted on Aug 06, 2010

  • 3 Answers

SOURCE: no heat, no light, has flow and power?

I'm experiencing the samething it's been installed 3 years and christmas day nothing. Please help.

Posted on Dec 26, 2010

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Those flow switches are easy to replace, only wire connections and a couple compression nuts. The replacement switches are available online.

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If your light stays on after water is shut off, your flow switch is sticking. YOu need to replace the flow switch. If your light shuts off, but the unit continues to heat and trips your tco, then your element is bad and the unit needs replacing.

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You need to have the flow switch looked at. The low flow of the water to the lavs and the kitchen sink, they all have as small demand next to t bath or shower,
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I have a Bosch Model GWH 1600 H tankless water heater. I have had issues with it since I installed it 2 years ago or should say had it installed.Yesterday I could not get it to ignite or light manually. I...


Igniter can be ordered, but that may or may not be the issue.
Your tankless unit -and- plumbing system need total check-up by trained service technician.
Open following links for Bosch troubleshooting resources including contact Bosch, manuals, error codes, water flow etc.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf
Check electrical outlet with circuit analyzer to make sure polarity is correct.
Typically, gas water heaters, and especially tankless water heaters require yearly maintenance by service technician who can check the gas pressure and supply, venting, electrical connections, PC board, sensors, burner orifices and igniter parts are clean and positioned correctly, vent is draining correctly and not dripping back into combustion chamber, correct temperature is achievable, incoming water temperature is not too cold for temp setting, proper incoming air supply, adequate air supply, no chemicals stored in air supply pathway, filters are clean, plumbing check valves, mixing valves, pressure valves etc are permitting one-way flow of hot water, water is softened to less than 11 grains hardness, water is filtered and not dirty, aerators and other faucet parts are clean and support water flow necessary to activate burner.

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There is likely an onboard relay stuck in the open position.

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AE115 is 2 years old and stopped heating the water. The red light is very, very dim which tells me it's a power problem. I've had no problems at all until now. I replaced the two 40 fuses and that did not...


Here are some possibilities and checks.
  1. The high temperature thermal cut-out has tripped. This would general shut off the Neon Light as well as the elements. However, even though your light is on check anyways.
  2. The flow switch not activating, Shut off the power to unit. Open the unit and observe if the flow switch activates when the water is turned on. If not then you have a faulty flow switch.
  3. Water flow to high. Turn the hot water tap on at the sink, adjust the outlet service valve until the water comes out of the tap at the required temperature, increase flow for cooler, decrease for hotter.
  4. The power selector screw not turned all the way to high. Check and turn all the way to high
  5. Element not working. Turn of the electricity to unit and test the resistance of the element. Here are the proper resistance for the element (240 volts, 40amps has a resistance of 2x12ohms) if no resistance than one or both elements need replacement.
I hope this gives you some more areas to check. Thanks for using FIXYA, Good Luck to you and have a great weekend. Jeff

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1 Answer

Sometimes the hot water just goes cold


Here are a couple things to look for:

1) flashing burner light - a flashing burner light indicates the unit is getting an error code
common error codes:
A. continuous flashing - ignition failure or abnormal combustion; look for visible water in the machine indicating a leak, check gas pressure, debris or buildup on flame rod/igniter plug, or clean unit with compressed air
B. 3 flashes - error 16, abnormal outlet water temperature; typically this code indicates you'll need to descale you unit
C. 4 or 5 flashes - exotic error codes; you should contact Noritz technical support to deal with these codes

2. If there is no flashing code, try increasing the hot water flow. In the summer time you typically use less hot water; this can result in intermittent operation of your tankless heater. Increase water flow by either: A. cleaning your showerhead and removing scale deposits B. widening your flow restrictor C. Remove your flow restrictor in the showerhead

3.If none of these resolves your problem, you probably have debris in your flow sensor. Contact Noritz technical support for a walkthrough on removing debris from a flow sensor.

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1 Answer

No hot water from bosch tankless heater


  1. If the display is blank, verify power to electrical outlet. (120VAC/60Hz properly grounded circuit required). Verify that the heater on/off switch is in the on (I) position.
  2. Verify the fuses in the control unit are good.To access fuses, the control unit must be removed. See BULLETIN TWH-G2-24 Two spare fuses are located inside lower access panel of control unit.
  3. Make sure cold water inlet connection is plumbed to the right side of heater when facing unit.
  4. A minimum of 0.8 gallons per minute (GPM) (3 l/m) is required to activate the heater. A quart container should fill in 20 seconds or less to activate heater.
  5. Clean inlet filter screen per chapter 5.2. of the installation manual.
  6. Inspect the water path for obstructions. Make sure all showerheads, faucet aerators and whole house filters are clear of debris.
  7. The heater activates when the water flow through the unit is at or above the required minimum of 0.8 GPM (3 l/m). A crossover creates back pressure on the water flowing through the heater. Therefore, a higher flow rate than normal is needed to force the heater to activate. To check for a plumbing crossover, shut off the cold water supply feed to the water heater. Then open all of the hot water taps served by the heater. Wait 10 minutes and check for water flow at taps. There should be no water flowing. Any continuous flow of water indicates a crossover is present and must be corrected. Consult a professional plumber for help in correcting a crossover. Failing single lever faucets and mixing valves are common causes of plumbing crossovers.
  8. With the ON/OFF switch turned to OFF (O) position and the power supply cord unplugged, remove theunit's front cover (See Page 5. Fig 3 of installation manual). Check wire connections between the water valve, control unit and electrode set. See chapter 9.2 of installation manual for location of these parts.

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2 Answers

PowerStar AE125 seems to have failed


You have a blown element. If you purchased the heater, call Bosch for technical assistance, and the unit should be under warranty. The grey matter your getting is the magnesium that the elements have in them.

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