Question about Stainless Steel 40,000 BTU Propane Patio Heater

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Outdoor propane patio heater wont light

I cant get my outdoor gas heater to start

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  • jimd684574 Jun 02, 2009

    how does one go about replacing the thermocouple on a patio gas heater? is this a fairly standard part that can be purchased at most hardware stores? how simple is it to replace?



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  • Master
  • 1,197 Answers

Hi before u cud go to replace the thermocouple.... there are other reasons too why ur patio gas heater doesnt light up or stay lit.... plese refer the picture below... it tells u the possible causes... only after checking all the possible causes can u be sure that the problem is with th thermocouple.....
outdoor propane patio heater wont light - 17bd5ef.jpg

if u feel the thermocouple needs to eb replaced... here is how u do it... before u do it.. u wud need a wrench and a screwdriver...

  • Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  • Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  • Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  • Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  • Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

  • While both doors are off, vacuum the burner compartment and check the water heater for water leaks.
  • Follow instructions on water heater to reignite the pilot light.

  • here is a video link on how to replace a thermocouple of a generic water heater... u can use this as a guide......

    you can get the thermocouple at ebay for a lesser cost... or you can get them at any one of the following websites...

    thank you good luck

    Posted on Jun 02, 2009

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    • Master
    • 355 Answers

    I would change the thermocouple and here is why:

    The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
    How the Thermocouple Works
    So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

    Posted on May 30, 2009

    • Rohit  Asthana
      Rohit Asthana Jun 02, 2009

      you can get a part from here
      Patio heater burner will not light?

      1. Allow 30 seconds for the LPG gas to reach the chamber before trying to light the patio heater burner.

      2. If the burner will not light and you cannot smell gas turn off the patio heater controls and check for blockages - see above.

      3. If there are no blockages and the patio heater thermocouple is working OK (pilot lights quickly) remove the patio heater's electromagnetic valve (located at the rear of the gas control valve) and if worn or damaged replace with a new electromagnetic valve.

      4. If the patio heater burner will not light and you can smell gas, turn off and check for leaks - see above leakage test.

      5. Next
        check the piezo igniter for a spark. If there is no spark remove the
        flame screen - see above. Turn the LPG gas supply to OFF position and
        check the piezo igniter. The piezo igniter should close to the patio
        heater thermocouple, if it has dislodged so the spark cannot reach
        adjust it until a spark can be seen. If the piezo igniter is failing to
        produce a spark check the igniter lead is connected to the rear of piezo igniter.

      6. To
        test the patio heater piezo igniter is working OK remove the ignition
        lead at rear of the igniter, place thumb over end and press the red
        button - you should feel a small sting. A new patio heater piezo
        igniter, see piezo igniter AFX470 for commercial patio heaters, piezo igniter AFX475 for domestic patio heaters and piezo igniter AFX477 for electronic commercial patio heaters, should be fitted according to the manufacturer's instructions.

      7. If
        you cannot smell gas and the pilot and burner will not light, check the
        tilt switch (if fitted) function. A failed tilt switch on patio heaters
        will prevent the LPG gas entering the gas control valve. Older patio
        heaters will have a factory fitted mercury tilt switch, newer patio heaters are fitted with mechanical tilt switch type A or mechanical tilt switch type B.

    • Rohit  Asthana
      Rohit Asthana Jun 02, 2009

      check this guideline for better understanding


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