Question about Terminator Aquastar 125FX Tankless Water Heater: FX Hood Horizontal Vent

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Hi, We have one of your tankless hot water heaters. At about this time of the year in southern CA it is difficult to take a shower. We run either really hot or really cold. Is this due to the water tanks in the city being on a hill and catching the suns warming rays? If "YES" or "NO" what can we do to correct this situation? New shower heads?

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Your water in southern california is very hot during the summer months. I would try pulling the aerators out of the sinks and shower heads and also pull the inlet screen out of the watervalve connection on the heater itself

Posted on Jan 19, 2009

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I have a Charmglow ventless fireplace. When I light the pilot the furnance will run properly until it reaches temp. then it shuts off the pilot goes out and requires relighting if it relights. I took your...


In any gas heating appliance there will be a thermocouple that sense if the pilot flame is lit (lighted?).
You bypass this with the regulator by holding the button temporarily and that allows you to light the main burner. If the thermocouple is bad (not uncommon- they sit in a hot seat all the time), it will disable the gas supply.
The thermocouple should normally measure nearly zero Ohms on a multimeter; if it doesn't, it's bad.
If the thermocouple checks out OK, then the regulator has failed.

Oct 24, 2009 | Terminator Aquastar 125FX Tankless Water...

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HI, I have a Bosch tankless water heater with electronic ignition and no pilot light. The heater will work great for a week or so then it will cut off for no reason and flash P2 in the readout. If I...


Actually E2 means the water is too cold. P2 is a computer program setting.

Check the connection of the temp sensor itself, maybe its broke on the inside if a new temp sensor didnt fix the problem.

Oct 03, 2008 | Terminator Aquastar 125FX Tankless Water...

1 Answer

Bosch Tankless HW Heater...Hot water flow becomes cold then hot again during shower. Have had only Bosch plumber in area out numberous times but never fixes the problem.


You are using a low flow shower head. you probably own the 250/2400 they have activation rate of .8gpm. If your shower head is low like this, your unit will deactivate. Higher flow shower head is a fix, or pull the aerator out of the shower head you have now might help.

Sep 23, 2008 | Terminator Aquastar 125FX Tankless Water...

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Tankless water heater


What error code do you get? I listed the Bosh telephone number below. They should be able to walk through it with you and diagnose it. Be prepared for long hold times though. I also listed the web site. There you can download the manuals and such. Good luck.

1-800-642-3111
http://www.boschhotwater.com/

Apr 19, 2008 | Terminator Aquastar 125FX Tankless Water...

1 Answer

Gradual decrease in water temperature


Rebuild the watervalve or replace it. 6 year old unit means its probably one of the 125 series. Probably a polymer gray water valve. Pay attention to the venturi, most likely its very dirty. You can get instructions off the www.boschhotwater.com websight to rebuild this.

Feb 20, 2008 | Terminator Aquastar 125FX Tankless Water...

1 Answer

Load beeping


I'm not sure what water cooling system you speak of. This is a propane water heater. Possible issues: pressure regulator making noise. Could be dirty or defective. Air in a water line. Excessive scale caused by hard water.

Nov 25, 2007 | Terminator Aquastar 125FX Tankless Water...

5 Answers

BOSCH AQ125FX TANKLESS WATER HEATER


these heaters work when a pressure drop is sensed in the water supply line. The pressure sensor is likely blocked with sediment from the city supply. You may want to call for service.

Apr 27, 2007 | Terminator Aquastar 125FX Tankless Water...

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