Troubleshooting
Model: GGF-400, GGF-720
7. Troubleshooting
This section describes troubleshooting procedures for the Giles, Model GGF Gas Fryer. Refer to the
wiring diagram included with this manual, as needed, for more detailed analysis (a diagram is also
attached to the unit’s Back Panel).
7-01.
Temperature Control System
Problem
FRYER WILL NOT TURN ON:
No power light
Probable Cause
A. Not connected to power
source.
A. Connect to power source.
B. Faulty fuse or circuit breaker.
B. Check fuse or breaker.
C. Fuse holder cracked.
C. Replace fuse holder.
D. Faulty Power Switch.
D. Replace Power Switch.
E. Improper supply voltage.
E. Connect to proper voltage
source.
FRYER WILL NOT HEAT:
A. Selector Switch not in cook
Power light on. Heat light not on.
position.
(No alarm sounding)
B. Thermostat set lower than
actual temp. of oil.
58
Repair Procedure
A. Place Selector Switch in cook
position.
B. Set temperature controller to
desired temperature.
C. Drain Valve open.
C. Close Drain Valve.
D. Cooking Controller faulty.
D. Replace Cooking Controller.
E. Selector Switch faulty
E. Replace Selector Switch
F.
F. Replace Probe.
Variable probe shorted.
G. Loose wire.
G. Repair loose wire.
H. Vacuum Switch out of adjustment.
H. Adjust Vacuum Switch.
I.
I. Replace Blower.
Blower faulty.
58
Troubleshooting
Model: GGF-400, GGF-720
7-01. Temperature Control System (Continued)
Problem
FRYER WILL NOT HEAT:
Power light on. Heat light not on.
Alarm Sounding.
FRYER WILL NOT HEAT:
Power light on. High Limit light
On.
Probable Cause
Repair Procedure
A. Fryer main gas line valve Is
CLOSED.
B. Fryer gas cock valve is
CLOSED.
C. Faulty Flame Sensor.
A. OPEN the main gas line valve.
D. Flame Sensor alignment is
incorrect.
E. Gas pressure incorrect.
F. Orifice size incorrect.
D. Adjust Flame Sensor.
G. Dirty Flame Sensor.
G. Clean Flame Sensor.
H. Faulty Gas Valve.
I. Faulty Ignitor.
H. Replace Gas Valve.
I. Replace Ignitor.
J. Faulty Spark Module.
J. Replace Faulty Spark Module.
K. Loose Wire.
K. Reattach Wire.
L. Faulty Gas Valve Transformer.
L. Replace Gas Valve Transformer.
M. Dirty Gas Burner.
M. Clean Gas Burner.
N. Loose Ignitor Wire.
N. Reattach Ignitor Wire.
A. Power surge.
B. Plug not completely in.
A. Turn Power Switch off for 5
seconds.
B. Reconnect to power source.
C. Oil level too low.
C. Fill Fry Pot to correct oil level.
D. Bad High Limit Board.
D. Replace High Limit Board.
E. High Limit Probe shorted.
F. Line spikes or noise in line.
E. Replace High Limit Probe.
F. Filter Line or remove noise
source.
B. Turn Gas Cock handle to ON
position.
C. Replace Flame Sensor.
E. Correct Gas Pressure.
F. Use correct orifice.
59
Troubleshooting
Model: GGF-400, GGF-720
7-01. Temperature Control System (Continued)
Problem
FRYER HEATS SLOW: (slow
recovery) Heat light stays on.
FRYER HEATS SLOW: (short
cycling) Heat light off and on
CONTINUOUSLY.
OIL TEMPERATURE ERRATIC:
OIL SMOKING:
60
Probable Cause
Repair Procedure
A. Incorrect Cooking procedures.
A. Consult Operations Manual for
proper Cooking procedure.
B. Burner system problem.
B. Check burner system.
C. Incorrect gas pressure
C. See Section 2-10, Gas Pressure
Setting & Adjustment
A. Low supply Voltage.
A. Supply proper Voltage.
B. Variable probe touching heat
exchanger.
B. Reposition variable probe.
C. Cooking Controller faulty.
C. Replace Cooking Controller.
D. Vacuum Switch out of adjustment.
D. Set Vacuum Switch correctly.
A. Variable Probe bad.
A. Replace Variable Probe.
B. Burner system problem.
B. Check burner system.
C. Cooking Controller faulty.
C. Replace Cooking Controller.
D. Loose Wire.
D. Repair loose Wire.
A. Old Oil.
A. Change Oil.
B. Over Temperature.
B. Check temperature setting.
C. Low Oil level.
C. Keep Oil at FULL Level.
D. Filter Powder in Oil
D. Change Oil.
Troubleshooting
7-02.
Model: GGF-400, GGF-720
Oil Filtration System
Problem
OIL NOT RETURNING TO FRY
POT:
Probable Cause
Repair Procedure
A. Selector Switch not in
“Filter/Pump” position.
A. Place Selector Switch in
“Filter/Pump” position.
B. Air Leak (hose, fittings, filter
paper).
B. Repair Air Leak.
C. Pump Motor Bad.
C. Replace Pump Motor.
D. Oil Pump Sticking.
D. Free Stuck Pump.
E. Diverter Valve not in TO FRYER E. Place Diverter Valve in TO
FRYER position.
position.
7-03.
F. Boil Out being run through
Pump.
F. Disassemble and Re-Oil Pump.
G. Old Oil allowed to sit in Pump.
G. Run Clean Oil through Pump.
H. Oil in Filter Pan cold or below
200°F (93°C).
H. Remove Filter Pan and remove
cold oil from Filter Pan.
I. Filter Pan incorrectly assembled.
I. Assembly Filter Pan correctly.
Basket Elevator System
Problem
BASKET WILL NOT GO UP OR
DOWN:
Probable Cause
Repair Procedure
A. Power not on.
A. Press Power Switch to ON
position.
B. Elevator Switch faulty.
B. Replace Elevator Switch.
C. Cooking cycles running.
C. Cancel cooking cycle.
D. Elevator micro-switch out of
adjustment.
D. Adjust micro-switch.
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