L.B. White Pilot Light Ignition Installation And Service Manual

Also see for 346: Installation and service guide Owner's manual and instructions

L.B. White Pilot Light Ignition Installation And Service Manual Manual pdf 35 page image

Troubleshooting GuideTroubleshootingInstructionsREAD THIS ENTIRE SECTION BEFOREBEGINNING TO TROUBLESHOOT PROBLEMS.The troubleshooting flow charts in this section providesystematic procedures for isolating heater problems. Referto the Component Testing section of this Service Guide forgeneral instructions on performing voltage and continuitychecks as well as evaluation of specific components asindicated by these charts. Refer to the appropriate wiringdiagram for assistance in performing voltage and continuitychecks. Refer to the Service section for gas pressure checksand adjustments as indicated by the flow charts.TEST EQUIPMENT REQUIREDThe following pieces of test equipment will be required totroubleshoot this system with minimal time and effort.• Digital MMultimeter - for measuring voltage and resistance.• Thermocouple TTest KKit - (L. B. White Part No. 500-08506)When used with a standard digital multimeter, this kitallows testing of the power unit of the pilot safety controland thermocouple on pilot ignition systems.• Low PPressure GGauge - (L.B. White Part No. 550-00764) forchecking inlet and manifold pressures of the gas controlvalve against dataplate rating.INITIAL PREPARATION■ Visually inspect heater for apparent damage.■ Check all hoses for abrasion and wear. Replace anythat are suspect.■ Make sure heater is properly installed and meetsminimum clearances to nearest combustible materials.(Refer to dataplate on heater.)■ Check all wiring for loose connections and worninsulation.To effectively use these flow charts, you must first identifythe problem. The problems are numbered sequentially,along with a brief explanation of each problem. Start at the“diamond” closest to the identified problem and proceedwith each step, performing the suggested tests. After eachstep or test, the guide will direct the service person to thenext logical step based on the outcome of the previouscheck.The problems are listed below along with the page numberon which you may find the flow chart for the specificproblem.Problem Description Page1 Pilot will not light 5.1-32 Pilot will not stay lit when pilot controlbutton is released 5.1-43 Motor runs. Burner does not light withpilot light lit. 5.1-54 Motor does not run, heater does not lightwith pilot light lit. 5.1-65 Main burner cycles on and off repetitively.Pilot stays lit. 5.1-76 Pilot will not stay lit when main burnerand blower are operating. 5.1-77 High limit switch is open. 5.1-88 Burner does not shut off. 5.1-99 Flame “lifting” off of burner. 5.1-910 Burner flame drops out after 10 - 15minutes of operation. 5.1-911 Gas control valve “chatters”. 5.1-1012 Motor “hums”. 5.1-1013 Heater is not delivering proper air flow 5.1-1114 Heater is not delivering proper heat output 5.1-11Components should be replaced only after each step hasbeen completed and replacement is suggested in the flowchart. Refer to the Servicing sections as necessary to obtaininformation on disassembly and replacement procedures ofthe component once the problem is identified by the flowchart.Additionally, a series of illustrations has been provided onthe following page to identify typical problems based uponpilot flame appearances.August 1999 5.1-11WARNINGElectrical SShock aand BBurn HHazard■ Do not attempt to service or repair this heater unlessyou are a properly trained and qualified gas heaterservice person.■ Troubleshooting this system may require operating theunit with line voltage present and gas on. Use extremecaution when working on the heater.■ Failure to follow this warning may result in propertydamage, personal injury or death.