Sigma 1457, 1433-000-E, 1456, 1434-000-E service manual Symptom Possible Cause Evaluation

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TROUBLESHOOTING GUIDE

IMPINGER ADVANTAGE GAS OVENS SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)

SYMPTOM

POSSIBLE CAUSE

EVALUATION

Oven fan will not run

Incoming power supply

Check circuit breaker, reset if required. Check power

 

 

plug to be sure it is firmly in receptacle. Measure

 

 

incoming power, call power co. if required.

 

Fuse, 10 Amp

Check, replace if necessary.

 

Fuse holder

Check, replace if necessary.

 

Switch, oven power

Check for line voltage supplied to switch. If no voltage is

 

 

present, trace wiring back to fuse holder. Check

 

 

continuity between switch terminals. Replace switch as

 

 

needed.

 

Motor, main fan

Check for line voltage supplied to motor. If no voltage is

 

 

present, trace wiring back to oven power switch. Check

 

 

motor for opens, shorts or grounds.

 

 

WITH POWER OFF: Turn fan blade to check for locked

 

 

rotor.

No control box cooling

Incoming power supply

Check circuit breaker, reset if required. Check power

 

 

plug to be sure it is firmly in receptacle. Measure

 

 

incoming power, call power co. if required.

 

Fuse, 10 Amp

Check, replace if necessary.

 

Fuse holder

Check, replace if necessary.

 

Switch, oven power

Check for line voltage supplied to switch. If no voltage

 

 

is present, trace wiring back to fuse holder. Check

 

 

continuity between switch terminals. Replace switch as

 

 

needed.

 

Cooling fan

Check for supply voltage to the cooling fan. If no

 

 

voltage is present, trace wiring back to the fuse holder.

 

 

If voltage is present and motor does not run, check

 

 

motor for opens shorts or grounds.

 

 

WITH POWER OFF: Check for locked rotor.

No automatic control

Incoming power supply

Check circuit breaker, reset if required. Check power

box cooling

 

plug to be sure it is firmly in receptacle. Measure

 

 

incoming power, call power co. if required.

 

Cooling fan thermostat

Check cooling fan thermostat (thermostat closes at

 

 

120°F and opens at 100°F). With cooling fan thermostat

 

 

pre-heated, check for continuity

Control box cooling fan

Cooling fan thermostat

See “Cooling fan thermostat” (NOTE: Thermostat will

continues to run

 

remain closed if control box temperature remains above

 

 

120°F.

Oven will not heat

Main fan

If not operating, refer to “Oven fan will not run”

S/N N31348 and

Gas supply

Check for adequate gas supply and be sure that the

Below

 

manual gas shut off valve is open. Also check flexible

 

 

gas line connection.

 

Air pressure switch

Check air switch terminals for supply voltage to

 

 

terminals NO2 and COM. If voltage is present on one

 

 

side only, check for air tube blockage or misalignment. If

 

 

these are okay, adjust air pressure switch or replace

 

 

switch as needed.

 

Oven cavity hi-limit

Terminals are normally closed, opens at 350°C (660°F).

 

thermostat

If open, reset and test oven for proper operation. If

 

 

thermostat will not hold for maximum temperature, and

 

 

oven is not exceeding control setting, check for proper

 

 

location of the capillary bulb in its spring holder. If above

 

 

checks are okay, replace hi-limit thermostat.

 

Gas pressure switch

This switch is located inside the gas valve and should

 

 

close when gas pressure is present.

6

Impinger I – Adv Digital – Gas Service Manual – International

Image 6
Contents Impinger Conveyor Ovens NAT. GAS Power SupplyTemperature Control LP GASSchematic Diagram Serial Number N28654 to N31348 Serial Number N31349 and Above Symptom Possible Cause Evaluation With Power OFF Remove 3 prong plug on gas Not stay on, check the reset button for the ignition Page With Power on and Thermocouple Belt JAMSensor sensor is located in the conveyor motor Cooling FAN, Control BOX Replacement FAN, Main ReplacementCAPACITOR, Motor Replacement Impinger Advantage SeriesTo Remove the Blower Wheel for Periodic Cleaning THERMOSTAT, Cooling FAN ReplacementBurner Blower Motor Replacement Burner AssemblyTemperature Regulation Valve Replacement SWITCH, Burner Reset ReplacementBurner Alarm Replacement THERMOSTAT, Oven Cavity HI-LIMIT ReplacementBurner Ignitor Replacement Spark Generator ReplacementConveyor Drive Motor Replacement Thermocouple Measurment Temperature Millvolts ApproxControl Transformer Replacement CAPACITOR, Conveyor Motor ReplacementOven Control Replacement Pilot Orifice ReplacementON-OFF Switch Replacement Fuse Holder ReplacementGeneral View Advantage Series Letter Part Number DescriptionPage Control BOX 1456,1457,1433-000-E, 1434-000-EPage Oven Back GAS and ElectricPage Conveyor 1450 Series Page This page intentionally left blank This page intentionally left blank

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