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Bosch TF250 Not Heating up

There is propane gas coming in but not going out the solenoid the contacts are very dark it doesnt close to allow gas through, Batteries are new plenty of HV spark but no gas to ignite. Running the water still doesnt move that closing, the voltage across the solenoid is very very low if anything. Don't know what to think solenoid or HV might need replacing, There was a lot  green around the negative terminals of the batteries  cleaned that, will need new battery contacts after the oxide gets to it, who knows. Adrian

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check this link this guide u how to repair

thank you

Posted on Oct 25, 2008

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Is something blocking the gas to go in to the solenoid check that first.

Posted on Oct 25, 2008

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  • ready2helpu Oct 25, 2008

    there is a sensor that goes from the gas valve to the pilot that is called a themocouple, change that and it will mostly solve your problem of not heatimg up.

  • ready2helpu Oct 25, 2008

    there may be a loose connection on the downstairs thermostat mounting plate ensure all power is off and check that all connections on the mounting plate and the pins that contact the controller are in good order.

  • ready2helpu Oct 25, 2008

    When a refrigerant is compressed it still contains the same amount of heat energy (don't confuse that with temperature, that's something else altoghether) that it had BEFORE it was compressed and since the volume is smaller, the temperature goes up. The state change (gas to liquid) also gives off a lot of heat, but don't let that part confuse you. The compressed (and heated) refrigerant is then passed through a coil of tubing and the heated refrigerant is cooled by the ambient air completing the gas to liquid state change.
    Then the compressed refrigerant passes through an orfice (a restriction in the tube) and is allowed to "flash" back to a gas. Now it's at a much lower pressure and the volume of refrigerant now contains much less heat (again, not to be confused with temperature) that it did when it was a liquid. Another part of the process is referred to as the "heat of vaporization", which really cools things off, sort of like the cooling from sweat when you get hot

  • ready2helpu Oct 25, 2008

    There is either a problem with the downstairs thermostat, or the wiring from that thermostat to the unit. First check the batteries in the thermostat. Yes the digital ones have batteries. :-) Next, if that doesn;t fix it, try switching your two thermostats. Be careful to wire them exactly as they were before. If your heat now works downstairs and not upstairs, replace the thermostat. If the problem remains unchanged and you still have heat up and not down - check your thermostat wiring. The voltage is low so a simple voltmeter can be used to confirm continuity from the end where it goes into the furnace to the end where it connects to the thermostat.

  • ready2helpu Oct 25, 2008

    replace the blower motor and flush the heater coil. I know the vents are working properly because they work when the temperature is selected to cold. I am wondering if there is something under the hood that redirects the aif flow either through the cooling coil or the heater coil based on the position of the temperature control. If so possibly the heater coil (air side) is clogged. I noticed that the heater coil is below the AC coil so it is possible that debris is down in it. I may try to pull it and clean it. Have you tried that?



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