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Hi there. Try cleaning the thermopile (cylindrical piece of metal behind the pilot) wwith a non-metal scrubbing pad. thermopile needs the heat of pilot flame to keep the pilot flame lighted as well as burners during operation. Kindly check also if the gas has sufficient pressure. Regards.
Probably the thermopile is not receiving enough heat from the pilot flame to generate 500 to 750 millivolt to hold pilot flame. The thermopile may have soot or dirt on it so try to clean or the pilot flame itself does not give enough heat, try adjusting pilot flame. Or the thermopile could not generate the right amount of millivolt even if it is clean and receiving enough heat from pilot flame, so better replace the thermopile.
Check also the hi limit, it must have continuity across its terminal.
The soot or carbon have probably build up inside the fire tubes, better check and have an authorized service technician clean them.
Make sure that the fryer is receiving the rated gas pressure and correct gas type as stated on the nameplate, this way, carbon or soot formation on fire tubes can be prevented
Check the gas pressure, it must meet the standard gas pressure written on the nameplate. Check also the quality of pilot flame, poor pilot flame quality will not properly heat up the thermopile which in turn will result in poor fryer operation.
Have a lighter handy (I use one of the elongated ones for caravaners)
in-between the burners is a pilot light (top right) keep the lighter flame where the gas comes out.
On the right hand side of the fryer at the bottom is a gas valve with a little black knob.
Press and hold the black knob in and gas will come out of the pilot light and ignite by the lighter flame. You need to hold the button in for quite a while. (until it stays lit)
When it stays lit depress the little black knob and turn it anti clockwise. Gas comes out of the burners and ignites from the pilot light. When it reaches temp. it will cut out.
To turn it off turn the little black knob clockwise. To turn the pilot light off, push and turn clockwise.
Check if the the gas pressure is sufficient (as stated on unit's nameplate). Check if the hi limit device is good. Check also if the thermopile (cylindrical metal with two wires standing behind the pilot hood) is receiving enough heat from the pilot flame. The voltage generated by thermopile should be 500millivolts in order to open pilot and main valve. If there is 500millivolt on gas valve thermopile and the pilot flame does not stay lit, you have to replace the gas valve. If the thermopile is glowing red and the voltage generated does not reach 500 millivots, you have to replace the thermopile.