How To Change 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 patio heaters please refer to the original supplier or manufacturer. Before starting you’ll need a pair of pliers, 8mm spanner and a Philips screwdriver. Never make any repair when connected to the LPG gas cylinder, disconnect appliance before starting and ensure the heater has not been fired for at least 2 hours. To change a patio heater thermocouple on branded 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 and lift the reflector and washers off. Store the reflector and wing nuts/washers safely. Next remove the 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 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. Place the burner upside down on a workbench or table. The surface area needs to be level to work on the burner. Old burners may have tiny pieces of emitter screen inside, this is normal and will not harm the burner. A budget patio heater will have a chrome/tin burner will be pitted with rust. Take a wire brush to clean the burner and remove the loose rust. All branded BFX patio heaters are true stainless steel quality and supplied with high energy and latest energy efficient stainless steel patio heater burner. 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. Remove 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. 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. 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. 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. 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: Patio Heater Guide To Problem Solving. © 2003/13 Urban Industry Limited
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