Frymaster FOOTPRINT 8196345 - Manual (Page 26)

1-20
Occasionally, an ignition failure situation occurs in which all components appear to be serviceable
and the microamp reading is within specification, but the unit nevertheless goes into ignition failure
during operation. The probable cause in this case is an intermittent failure of an ignition module.
When the unit is opened up for troubleshooting, the module cools down enough to operate correctly;
however, when the unit is again closed up and placed back into service the module heats up and fails.
PROBLEMS RELATED TO THE GAS VALVE
If the problem is not in the 24 VAC circuit, it is most likely in the gas valve, itself. Before replacing
the gas valve, refer to Section 1.11.2
TROUBLESHOOTING THE GAS VALVE .
1.10.2 Improper Burner Function
With problems in this category, the burner ignites but exhibits abnormal characteristics such as
“popping,” dark spots on the burner ceramics, fluctuating flame intensity, and flames shooting out of
the flue.
“Popping” indicates delayed ignition. In this condition, the main gas valve is opening but the burner
is not immediately lighting. When ignition does take place, the excess gas “explodes” into flame,
rather than smoothly igniting.
The primary causes of popping are:
• Incorrect or fluctuating gas pressure
• Defective or incorrectly adjusted combustion air blower
• Inadequate make-up air
• Heat-damaged computer or ignition module
• Cracked ignitor or broken ignition wire
• Defective ignition module
• Cracked burner tile (typically causes a very loud pop).
If popping occurs only during peak operating hours, the problem may be incorrect or fluctuating gas
pressure. Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the
appropriate CE or Non-CE Standard found in Section 2.3 page 2-4 of the Protector
®
Series Gas Fryer
Installation and Operation Manual (PN 819-6339), and that the pressure remains constant throughout
all hours of usage. Refer to Section 1.7, Checking the Burner Manifold Gas Pressure in this
manual for the procedure for checking the pressure of gas supplied to the burner.
If popping is consistent during all hours of operation, the most likely cause is an insufficient air
supply. Check for “negative pressure” conditions in the kitchen area. If air is flowing into the kitchen
area, this indicates that more air is being exhausted than is being replenished and the burners may be
starved for air.
If the fryer’s gas and air supplies are correct, the problem is most likely with one of the electrical
components. Examine the ignition module and computer for signs of melting, distortion, and/or
discoloration due to excessive heat build-up in the fryer (this condition usually indicates improper
flue performance). A melted or distorted ignition module is automatically suspect and should be
replaced; however, unless the condition causing excessive heat is corrected, the problem is likely to
recur.