Williams 4003531, 2503531 installation manual Observed Problem Possible Cause

Page 17

OWNER’S MANUAL

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Ignition failures

1. Glo bar will not glow - with blower run-

 

ning and microswitch engaged

2. Glo bar glows but burner will not come on

3. Glo bar operating and gas valve open- ing but burner will not light

4. If the ignitor remains on after main burner ignition or the valve chatters, re- verse the 120-volt A.C. connections at the wall receptacle

1.Check the following:

A.Check for 24 volts A.C. across yellow and orange wires at ignition control. If no volt- age, check microswitch and limit switch for circuit completion as well as wiring and wir- ing connections

B.Voltage present across yellow and orange wires, check for 120-volt input to ignition control across red and blue wires. If no voltage, check wiring all the way back to power supply

C.120 volts present across red and blue wires, check for 120 volts across the two white wires at ignition control. If no voltage, replace igni- tion control

D.Voltage present across the two white wires, check wiring and wire connections to glo bar

E.If wiring and wire connections okay, replace glo bar. (Glo bar broken)

2.A. Check for voltage (24 volts A.C.) at valve 40 seconds after glo bar begins to glow. If voltage present but valve not opening, replace valve

B.If no voltage at valve, check brown wire at ignition control for continuity and good con- nection

C.If wire and wire connections okay, replace ignition control

3.A. Check gas flow through burner. If no gas is coming through burner, check for obstruc- tion in gas line, main burner orifice, or main burner

B.If thermostat okay, check for 24 volt A.C. circuit completion across yellow and orange wires at ignition control. If no voltage, check for circuit completion through limit switch and microswitch

C.If voltage is present at ignition control across yellow and orange wires yet burner contin- ues to go off, replace ignition control

4.A. If polarity is okay yet burner continues to go off, check thermostat to be sure it is still com- pleting the valve circuit. If not, check for excessive amp draw in valve circuit

B.If thermostat okay, check for 24 volt A.C. circuit completion across yellow and orange wires at ignition control. If no voltage, check for circuit completion through limit switch and microswitch

C.Voltage present at ignition control across yellow and orange wires yet burner contin- ues to go off, replace ignition control

Continued

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Contents For Your Safety What to do if YOU Smell GAS OWNER’S Operation and Installation ManualFor Your Safety Safety Information Specifications Product FeaturesLocal Codes UnpackingInstallation Items InstallationCheck GAS Type Locating FurnaceInstalling in Normal Frame Wall Installing ThermostatInstalling in Masonry Wall Creating Wall Opening and Mounting FurnaceRouting Thermostat Cable Locating Thermostat on WallMounting the Thermostat to Wall Connecting to GAS SupplyConnecting Furnace to Gas Supply at Front of Furnace Removing Screws on Lower Flange 40,000 BTU/Hr Model Shown Connecting Furnace to Gas Supply at Rear of FurnaceExample Providing Gas Piping to FurnaceChecking GAS Connections Pressure Testing Gas Supply Piping SystemPerformance Check Pressure Testing Furnace Gas ConnectionsOperating Instructions For Your Safety Read Before LightingOperating Furnace Normal Operating Sequence Inspecting Burner FlameTo Turn OFF GAS To Furnace Thermostat Control OperationCleaning and Maintenance Observed Problem Possible Cause Remedy TroubleshootingIgnition Failures Observed Problem Possible Cause Wire and wire connections at probe Service Hints Wiring Diagrams ReplacementTechnical Service PartsCabinet Assembly 25,000 BTU/HR Model Illustrated Parts ListCabinet Assembly 40,000 BTU/HR Model Combustion Chamber Assembly 25,000 BTU/HR Model Combustion Chamber Assembly 40,000 BTU/HR Model Burner Assembly 25,000 BTU/HR Model Burner Assembly 40,000 BTU/HR Model Blower Assembly 25,000 BTU/HR Model Blower Assembly 40,000 BTU/HR Model Limited Warranty Williams GAS Wall Furnace Warranty Information

2503531, 4003531 specifications

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