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Bosch TF 250 hot water service, can not get the pilot light to stay on...

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  • Anonymous Jun 08, 2008

    I also found that problem. Iinitiallly a change of batteries helped but the iginition kept firing all the time and the next batteries were empty after two weeks. Eventually new batteries could not fix the problem. Yes it seems that the power supply from the battery 1.5V to the High Voltage converter runs via a thermo couple. But shorting this did not help the ignition problem. How can I check whether the HV converter is broken?


  • Englandrules Mar 16, 2009

    Yep sounds familiar, mine starts intermitently. I've put a ammeter between the feed to the pilot solenoid (green one) and the solenoid valve itself and measured 10mA. I've then removed the solenoid and fed it directly from a 1.5V cell with the same ammeter setup and measured 30mA continuous. I've then put a voltmeter across the battery box and tried to start the heater (turned on the tap). Battery voltage hardly drops at all. I therefore think there must be a transistor in control box with has gone low current gain. To check it I got he missus to turn the water on with me giving a direct 1.5V feed from the battery box to the pilot solenoid and voila! She fired up! Plumbing supplier now want $150 for new controller *!!@

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Thre is a sensor thaat goes from the gas valve to the pilot that is called a themocouple change that and you will have no more problem

Posted on May 27, 2008

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FixYa - Bosch tf250 is not an air conditioner, it is a instantaneous gas hot water service...

Posted on Nov 26, 2011

  • Robyn Sprod Nov 26, 2011

    FixYa - Bosch tf250 is not an air conditioner, it is a instantaneous gas hot water service...

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My fathers Bosch water wizard tf 250 will not start. the water will flow but no gas will not ignite or come through the pipe to the heater. the gas bottle is full. thanks Dave Tooley


Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.

If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

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1 Answer

Do I need to replace the thermocoupling on my Reliance 501 gas water heater? Model is 5 30 NOMT7 C. Recently, I've noticed an intermittent problem with the the hot water not staying consistent. So we're...


The thermocouple is a safety for the gas valve. It tells it the pilot light is lit. If your pilot light is not going out and the burner fires when you turn up the thermostat, it is all working as it should. In other words, if you don't need to re-light the pilot, your thermocouple is OK. Turning up the temperature of the water is a good idea, just be careful not to burn anyone with the hotter water. You mite want to try a water saver shower head. Some don't throw enough water to get the soap off, but I bought one that can be turned to adjust flow and we have been happy with it. If I missed what you need from this, please let me know. Roger

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1 Answer

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You may have a dirty pilot orifice. Try this. Turn off the pilot by turning the control knob to off. Remove the front panel to get access to the pilot orifice. Use a can of compressed air with attached straw (the same stuff you use to clean computer keyboards) and blow out the pilot orifice, which is inside the pilot assembly where the pilot flame burns. Blow it out from the top and from the sides through the air holes. Then relight the pilot and see if that improves the flame size and color (blue) to heat the thermocouple.
Here is a link to the manual and instructions. www.tanklesswaterheatersdirect.com/shop/tanklesswaterheaters/manuals/125B_manual.pdf

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1 Answer

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is it full of dust my hot water used to do the same till i blew the dust and fluff out

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