Rangemaster 110 LPG Range (5364) right hand oven lights but flame only stays low? What is the likely problem please

Ream out all the orifices and air venturi holes on the burner, adjust the air-ahutter, the air-shutter is usually nearer the valve/knob than to the burner. Yellow flame is an imbalance of fuel to oxygen and is creating Carbon Monoxide and not burning cleanly... this is the same problem that can make a furnace deadly. Blue flame=neutral flame.

common problem, there is a device in the oven called a solenoid/ff device these are safety devices and fail after a few years. replacements can be obtained from main stockist Gas On spares on 0121-585-7799

the flame needs to be adjusted there's a small screw right inside of the shaft where the knob goes. Pull knob off and there should be a screw inside that u shaped shaft. Turn the burners on and set the flame accordingly.

The OVEN flame size is consistently one size.
The thermostat simply stays closed longer when asking for higher temperature in the oven.

the flame safety device need replacing (FFD)... this lets the full gas through when flame is sensed... safety 1st as a gas engineer will be required..

Hi,

The fault you have there my fellow gasman is that the FSD (flame safeguard device) is faulty.

I take it you have tested to make sure the customer has 20mb incoming working pressure (NG)? or if it's LPG 35 - 39mb?

I hope this helps :)

Its the flame failure device faulty (FFD)

The knob won't have any effect on the flame size.  The knob controls temperature.  If you're referring to the pilot light staying on and then the main flame not going on...that's another problem.  If the main flame will not go on, the assembly that controls the main flame is likely defective.  If the unit has a thermocouple, you might change it out first.  Sometimes, that's all that is needed and they're cheap.

Reading the user manual, it states that the flame initially comes on low, until it is "sensed" by the flame sensing device. This to me sounds suspiciously like the flame isn't being sensed and so never gets increased to the normal level.
I've not had time for a proper look at it.... but from a quick glance this morning this looked like a "flame rectifier" probe next to my burner (as we commonly use in boilers to sense if the gas burner is lit). This is just a metal probe. They send a high-ish AC voltage signal (Sine wave) from it, through the flame, to the earthed metal case. The flame acts like a diode (yes it really does work !) and simple electronics detects the change in the applied signal (rectified) due to the flame. I know from personal experience they (the probes) get coated with crud (carbon, etc) and need a good clean. I suggest you try cleaning both it and the metal area opposite it. If necessary the probes metal tip could be GENTLY rubbed with very fine Emmery cloth, etc, if badly coated.
Other than that, if it is sensing the flame, then it must be the gas control device (solenoid valve ?) that is jammed, blocked or just defective.
Simples......

some older ovens did use one side just as a "bread warmer"...only way to tell for sure is to check if there is a burner below the left side