My fryer wont lit up the fire.only the pilot works

Check if there is sufficient gas supply as stated on the unit's nameplate. Check if there is no soot/ carbon build up on the thermopile for this will lessen the heat from pilot thus reducing milli volt it will generate to open the main valve, in short, main burner will not fire up if there is soot/ carbon on thermopile. Check and tighten also all of wiring connections.Check if the thermostat is set at higher temperature. If all of these did not correct the problem, try replacing the thermopile.