Grill will not stay lit

[Gerry_374308685]

Hi all

I have a Rose 6000 cooker that allows you to light the oven but when I try to light the grill I depress the knob, rotate it to full on,light the gas and keep holding the knob in for at least 15 seconds but as soon as i release the knob the gas goes out.I wondered if anybody else had this problem and how they fixed it.

 

[parker1158]

Hi Garry

There is a safety device fitted that shuts of the gas if an appliance is turned on without being ignited. I cannot remember what its called someone else may be able to enlighten you. If you look at the flames when the grille (Or oven and hob burners) is lit you will see a thin wire across the flames with a slightly bulbous end that will be glowing red as the flame plays on it. This is connected to the gas supply so as it gets hot it sends a thermal message to the supply to stay open, hence why you have to hold the knob for a few seconds. If there is no heat, i.e gas accidentally turned on the supply will be cut. I would imagine your sensor has failed. I fitted one to a domestic cooker many years ago for exactly the same symptoms as you have. I found the job quite straightforward, others will tell you not to mess with gas appliances.

 

[parker1158]

sorry Gerry, had not got me glasses on

 

[ThePlotter]

It is a thermal coupling and looks like a spike sticking into where the flame should be check that it has not been knocked or that when cleaning is has moved.

 

[Gerry_374308685]

Thanks for your help and I will try and get the spare part.

Thanks again

Gerry

 

[Clive-Cardiff]

Hi Gerry,

We get the same trouble with our grill. On ours the thermo-couple is fitted on the back side of the burner and the spark igniter is on the front. If you press the igniter as soon as you turn on the gas only the front part of the burner will light and there is no flame for the thermo-couple. It's very difficult to see this, you have to get the angle you are looking at the burner just right.

We have found that if you hold the gas tap on for just 2-3 seconds the press the igniter both sides of the burner will light.

I must emphasise that you only hold the tap open for 2-3 seconds otherwise it could singe your eyebrows

 

[ProfJohnL]

Hello Gerry

There are a number of possible reasons as to why your grill may not be staying alight.

As others have pointed out, most grills have a 'Flame Failure Device' (FFD). When you press the gas control knob, you are forcing open a small solenoid inside the gas valve. This allows the gas to flow to the burner. When you light the gas, the heat from the flame impinges on a thermocouple. When it gets hot it generates an electric current, which in turn holds open the solenoid built into the gas valve.

Consequently if the thermocouple does not get hot, or if the flame goes out, the thermocouple does not produce a current, and the solenoid closes, shutting off the gas flow. A similar system is employed in many gas appliances, but they do not necessarily use interchangeable parts.

In your case the symptom suggests the FFD has stopped working.

It could be that the flame pattern on the grill is not correct - rust of other debris may be occluding the burner, preventing the proper flame spread.

The thermocouple may be damaged - they live I a very hostile environment and will eventually fail through use.

The cable that joined the thermocouple to the gas valve may be damaged, interrupting the electric current.

The screw in coupling on the end of the thermocouple cable into the gas valve may be loose or corroded.

The solenoid may have become open circuit.

The fact that you have raised the question suggests that you may not have the necessary knowledge to diagnose or safely repair the appliance. So I am one of those who will tell you that to attempt any repair on any gas appliance you MUST be legally competent and know how to do the job, how to test and prove the system according to the regulations.