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How To Replace a Patio Heater Thermocouple

These instructions are for a BFX750 patio heater, generic patio heaters are not covered by these instructions. For generic, unbranded or other brands of gas patio heaters please refer to the original supplier or manufacturer. Before starting you’ll need a pair of pliers, 8mm spanner and a Philips type screwdriver. Always work on a patio heater that has not been fired up for at least 2 hours and ensure the gas cylinder is not connected to the heater.

  1. To change a patio heater thermocouple on a BFX750 patio heater remove the burner from the patio heater pole and move it onto a workbench or table. To do this, remove the reflector by unscrewing the 3 wing nuts on top, lift the reflector and washers off. Store the reflector and wing nuts/washers safely.

  2. patio heater clip on regulator Next remove the LPG regulator from the hose. Either cut the hose just above the regulator or unscrew the jubilee clips to remove. Generic patio heaters may fit steel gas pipes (not recommended) with shorter LPG hose than quality patio heaters.
    Store with other parts.

  3. patio heater pole screws Loosen and remove the 4 stainless steel bolts at the top of the patio heater pole, keep one hand firmly on the burner when removing the bolts to hold it steady and prevent the burner dropping to the ground. Lift the patio heater burner off the pole, keep the hose attached to the burner. Before making any repair check the condition of the LPG hose, look for any splits, cracks or wear from top to bottom.

  4. patio heater burner repair Place the patio heater burner upside down on to a workbench or table. The surface or work area needs to be level to work on the burner. Old burners will have small pieces of emitter screen inside, this is normal and will not harm the patio heater. If the burner is a generic chrome or tin type, the body will be pitted with rust. It may be useful to take a wire brush to clean the burner and remove the loose rust. All branded BFX patio heaters are superior quality and supplied with high energy and latest energy efficient stainless steel patio heater burner.

  5. patio heater burner screen Remove the flame emitter screws by unscrewing the 4 stainless steel screws using the Philips type screwdriver. They should unscrew with little pressure but should the screws stick spray with an oil based lubricant and leave for 10 minutes to soak. If they are still stuck fast the best way to loosen the screws is to apply a flame around the screw to expand the burner casing.
    Generic chrome or tin burners will struggle to open, most of the screws are steel type and difficult to remove without drilling out.
    Store the flame emitter screen and 4 screws with the other parts.


  6. patio heater burner mesh
    Remove the 4 stainless steel screws just above the body of the burner. Carefully squeeze and lift off the cylindrical mesh and thread through hose to remove. This will give easy access to the back of the gas control valve needed to change the thermocouple. Store with other parts.

  7. inside patio heater burner

    With clear access to the thermocouple first disconnect the tilt switch. On branded BFX patio heaters the tilt switch is AFX435 type A, on generic patio heater or older models the tilt switch may be type C. With the pliers pull off the two spade connectors attached to the tilt switch. Generic patio heaters may have these soldered on, adjust accordingly.

  8. patio heater burner screen The patio heater thermocouple is located at the back of the gas control valve. Unscrew the thermocouple using the 8mm spanner. Normally the thermocouple will unscrew easily, avoid using excessive force. When loose pull out from the back of the gas control valve.
    The thermocouple is fitted to a large sleeve nut either silver colour as shown or on generic patio heaters it may be brass. Loosing this will reveal the electromagnetic valve.
    Unless the electromagnetic valve require changing it's best to leave this on


  9. patio heater thermocouple clips
    Turn the burner on its side with the thermocouple tip facing you. Unclip the thermocouple using the pliers. This will loosen the patio heater thermocouple completely for removal. Take out the old thermocouple and retain the clip. Generic patio heaters may be fitted with a steel screw to hold the thermocouple in place. The latest patio heaters use a clip to secure the thermocouple in place, this avoids corrosion issues with steel nuts.

  10. patio heater thermocouple parts

  11. Thread the new patio heater thermocouple in reverse order and refit. Remember to leak test before lighting the patio heater, if any leaks are found tighten any loose connection. To conduct a leakage test see: .

    Download Instructions

    adobe pdf image Instructions On How To Change A Patio Heater Thermocouple

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