Vulcan-Hart service manual Troubleshooting Guide

Page 19

TROUBLESHOOTING GUIDE

SYMPTOM

CAUSE

REMEDY

 

Pilot does not light after

Problem with pilot valve

Check operation of pilot valve

 

igniter has been on

 

 

 

several minutes

Gas supply not purged of air

Purge gas lines

 

 

No gas supply

Check that gas supply is on

 

 

Loose wire connection

Check and repair wire connection

 

 

Obstructed or wrong size pilot orifice

Check for obstruction or wrong size

 

 

 

orifice

 

 

Problem with alignment of pilot and

Realign pilot and igniter

 

 

igniter

 

 

 

 

 

 

Pilot fails to remain lit

Loose wire connection

Check and repair wire connection

 

after igniter goes out

 

 

 

(Pilot may cycle on and

Air blowing pilot out

Correct air flow

 

off normally several times

 

 

 

after cold start-up before

Obstructed or wrong size pilot orifice

Check for obstruction or wrong size

 

the pilot heats up.)

 

orifice

 

 

Problem with alignment of pilot and

Realign pilot and igniter

 

 

flame switch

 

 

 

Problem with flame switch

Check operation of flame switch

 

 

 

 

 

Burner does not come on

Thermostat setting too low

Adjust thermostat to a high

 

(burner light does not

 

temperature setting

 

come on)

Problem with thermostat sensor

Replace sensor

 

 

 

 

Problem with temperature controller

Check or replace controller

 

 

Problem with thermostat gas valve

Check thermostat gas valve

 

 

Loose wire connection

Check and repair wire connection

 

 

 

 

 

Heat does not turn off,

Problem with thermostat gas valve

Check or replace thermostat gas

 

burner light is off,

 

valve

 

temperature is above

 

 

 

thermostat setting

 

 

 

 

 

 

 

Heat does not turn off,

Problem with temperature controller

Check or replace temperature

 

burner light is on,

 

controller

 

temperature is above

 

 

 

thermostat setting

 

 

 

 

 

 

 

Temperature varies

Low gas pressure

Check and adjust proper gas

 

 

 

pressure

 

 

Faulty thermostat sensor

Replace faulty thermostat and sensor

 

 

 

 

 

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F35628 (10-04)

Image 19
Contents 900RE Series Heavy Duty GAS Griddles Table of Contents Tools Installation Operation Cleaning SpecificationsGeneral IntroductionComponent Location Removal and Replacement of PartsCovers and Panels Control PanelIndicator Light Power ON/OFF SwitchThermostat Ignitor Module Flame SwitchPilot Solenoid GAS BurnerDual Solenoid PilotMain Burner Adjustment Service Procedures and AdjustmentsThermostat Calibration Pressure Readings in W.C GAS Pressure MeasurementComponent Description Sequence of Operation Electrical OperationSchematic Diagrams Schematic Drawing for 36 Griddle Schematic Drawing for 48 Griddle Schematic Drawing for 60 Griddle Schematic Drawing for 72 Griddle Symptom Cause Remedy Troubleshooting GuideTroubleshooting Guide Form 35628