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Verify that the ignition wire is tightly connected at both ends and free of obvious signs of damage.
Again, if damage is due to excessive heat in the fryer, that problem must also be corrected. Check for
proper operation by disconnecting the wire from the ignitor (spark plug), inserting the tip of a screw
driver into the terminal. With the insulated handle of the screwdriver, hold the shaft near the frame of
the fryer as the power switch is placed in the ON position. A strong, blue spark should be generated
for at least four seconds.
DANGER
Make sure you are holding the insulated handle of the screwdriver and not the blade.
The sparking charge is approximately 25,000 volts.
Examine the ignitor (spark plug) for any signs of cracking. A cracked ignitor must be replaced.
If all other causes have been ruled out, examine the burner tiles for any signs of cracking. If cracking
is found, the burner must be replaced.
Fluctuating flame intensity is normally caused by either improper or fluctuating incoming gas
pressure, but may also be the result of variations in the kitchen atmosphere. Verify incoming gas
pressure in the same way as for “popping,” discussed in the preceding paragraphs. Variations in the
kitchen atmosphere are usually caused by air conditioning and/or ventilation units starting and
stopping during the day. As they start and stop, the pressure in the kitchen may change from positive
or neutral to negative, or vice versa. They may also cause changes in airflow patterns that may affect
flame intensity.
Dark spots on the burner tiles are the result of an improper air/gas mixture. Adjust the combustion
air blower to reduce the amount of air in the mixture to correct this problem
Flames shooting out of the flue are usually an indication of negative pressure in the kitchen. Air is
being sucked out of the burner enclosure and the flames are literally following the air. If negative
pressure is not the cause, check for high burner manifold gas pressure in accordance with the
procedures in Section 1.7.
An excessively noisy burner, especially with flames visible above the flue opening, may indicate
that the gas pressure is too high, or it may simply be that the gas valve vent tube is blocked. If the
incoming gas pressure is correct and the vent tube is unobstructed, the gas valve regulator is probably
defective.
Occasionally a burner may apparently be operating correctly, but nevertheless the fryer has a slow
recovery rate (the length of time required for the fryer to increase the oil temperature from 250ºF to
300ºF (121ºC to 149ºC)). The primary causes of this include an over-filled frypot, a dirty or
out-of-adjustment combustion air blower, low burner manifold pressure, and/or damaged burner tiles.
Adding oil to the frypot during the recovery process will also cause a slow recovery rate.
If these causes are ruled out, the probable cause is a misadjusted gas valve regulator. Refer to
Section 1.7, Checking the Burner Manifold Gas Pressure, for the gas valve adjustment procedure.
1.10.3 Improper Temperature Control
Temperature control, including the melt cycle, is a function of several interrelated components, each
of which must operate correctly. The principle component is the temperature probe. Other
components include the interface board, the computer itself, and the ignition module.