I have an outdoor gas LPG heater where the pilot gas light will light but will not stay alight to fire up the heater! Have cleaned & adjusted the themo-couple senser but no joy

These are designed not to light once the thermocouple fails.the thermocouple has a small wire that positions in to the pilot light which checks the pilot is on and keeps the gas governed.once the temperature drops it shuts off the gas to prevent a build up of gas in a room where a pilot light has gone out.this is why you need to hold the button in on reignition to allow the thermocouple to heat up so the gas keeps open.
Try to relight by turning on the gas ....pressing down and holding the button for at least 10 seconds whilst firing the piezo to ignite flame.do not release gas button for at least 10 seconds then slowly release.if the flame on the pilot will not stay alight....then it is likely the thermo has failed.try cleaning the metal wire that is above the pilot jet.still no joy then it needs replacing.hope my comment is of help...please vote.

gas fire in house and pilot will not stay alight then its the bi-metal thing in the flame needs renewing ,its brass and ivor metal and it expands to hold the valve open ,now can i please answer the car questions ?

the gas valve needs replacing

I know that on some models you can adjust the pilots. Also you might try changing out your control valve. Good Luck

Clean the burners out with air pressure,like from a air tank,and a blow gun,then clean the pilot light orifice(this is where the pilot light is)if this does not help,replace the thermocouple ,it will be the problem,if this was at all helpful,please rate,thank you.

Hi clean pilot light and change the thermocouple , you will have to remove the gasfire to get to the boiler if unsure best get a gas fitter to do this as this is not easy to explaine , simple job but you have to know what you are doing , it might be you need a service on the bbu and the gasfire then the thermocouple could be done at this time.

If the thermocoupler is defective the gas to everything is shut off. The coupler is the bulb that sits ib the pilot flame If it doesn't heat up it will sense no pilot and shut the gas off. They don't cost much and are easy to change. Good Luck, Ned

change the thermocouple.

You are half-way right, to light the pilot, light it and push down the red button and hold it for at ----least2-minutes-- till the flame heats up the pin (thermocouple- which fire-thermocouple metal makes electricity which sends it to the gas valve and says ,OK GAS VALVE,I'VE GOT A PILOT FLAME SO OPEN UP THE MAIN GAS VALVE! See where I'm going with this?