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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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  • Master
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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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