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Re: Bosch Highflow Water Heater - model YS2433R. Hot water runs for 1-2 mintues and then turns cold. Burners turn off. Display flashes "14" (error?). Started when winter set in. Ph. 64 4 5666948

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Q. Burners Do Not Ignite When Hot Water Is Turned On?
A.

  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.
Q. Water Is Too Hot?
Q. Water Is Not Hot Enough

Posted on Jul 05, 2008

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Hi there,

have you gone checking the unit... first check the thermostat switch, and also the fan blower fuse/resistor.. It could be one of those is not functioning well now...

Let me know...

Posted on Jul 05, 2008

  • micromaster
    micromaster Jul 05, 2008

    Change the blower fan resistor when if this part is broken. Its often located (screwed on to) the blower fan casing (housing).

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1 Answer

My Boch 24ES Highflow Hotwater is showing Code 14 and only runs for i minute then shuts off


Code 14.
What water heater do you have?
Question posted under tankless Bosch, but these error codes start with a letter.
Rheem/Richmond etc Tankless has error code 14
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
Call tankless service technician.
Ask technician how much it costs to have recommended yearly service.

Or install whole new tank-type gas water heater yourself for $350 from local box store, and avoid the entire headache, then sell tankless online for parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Aug 09, 2012 | Water Heaters

1 Answer

Hi my Bosch 18 e highflow instantaneous hot water service, turns water cold after a minute or so then stays cold. When you turn the water off the pressure valve keeps pulsating for about 5 seconds. The...


Open following link for Bosch troubleshooting resources, including contact phone numbers and possible manuals.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If the conversion was made 3 years ago without a problem since, it might not be a factor.

May 05, 2011 | Water Heaters

2 Answers

I have a bosch YS2433R 'Highflow' hot water system. It has a YPRM34XB controller. The controller constantly flashes the number '99'. My home has no hot water. How do I fix this error on the controller so...


Solution for a code 10 or 99 (for my own reference as much as anything!)
Hit change and the down arrow on the controller for 3 seconds.
Wait for the controller to beep and display 00 before using the down key to display 93.
Hit the On/Off button until 000 is displayed on the screen.
Press change and down simultaneously and the controller should revert to the pre set temperature. Hey presto! Hot water!!!

Nov 01, 2010 | Bosch & Tankless LP Hot Water Heater

2 Answers

Burners will not disengage after shutting off Hot Water.


Ok the way this system works is from a pressure and flow switch. The pressure switch picks up the slight drop in pressure when the hot side water is turned on then turns on the burner. The flow switch measures the amount of water flowing and adjusts the size of the burner to the amount of water flow. So a couple different things might be happening. The flow switch might be sticking causing the water heater to throttle down the burner but not off when the water flow is off. Or the gas control valve might be by-passing gas when off causing the burner to stay on even when the demand is off. Run the hot water on high demand then turn the water off. If the burner is still on try banging on the water heater with your hand and see if the burner shuts off completely. If it does the gas control valve might be by-passing. You would also need to check and see if the pressure/flow switch is giving any voltage signal changes when the water flow is off. These tankless water heaters are more comlplicated to work on than a standard water heater and you may need a professional's help...good luck

Sep 23, 2009 | Bosch AquaStar 125FXKIT-NG 125FX Natural...

1 Answer

Bosch water heater


I'd initially check for a cross connection (cold water leaking into hot water system). This can be done by shutting off the cold water feed to the tankless unit, then opening up hot water fixtures around the home. You should see the water come to a complete stop; if you see a steady stream of water, then you have a cross connection. The most common place for a cross connection is at single handled showers. The valve cartridge starts to fail over time.

Jul 09, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

No hot water


diaohragm valve or micro switch

Nov 14, 2008 | Bosch & Tankless LP Hot Water Heater

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