Williams 6007731 Owner's Manual download pdf (Page 44)

Troubleshooting

TROUBLESHOOTING CHART FOR Models FOR MODELS: 4007732; 6007732; 4007731; 6007731

*Also applicable to Models equipped with an electric intermittent pilot system. (Continued on next page)

SYMPTOM

POSSIBLE CAUSE

CORRECTIVE ACTION

1. Pilot will not stay lit

after following lighting

instructions.

A. Thermocouple producing

insufficient millivolts.

Check pilot flame – it must impinge on the thermocouple. The pilot flame may be low

or blowing (high) causing pilot to drop out. The pilot orifice or aerating hole may be

plugged (check for spiders, webs or other organic material). Be sure the thermocouple

is fully inserted in its bracket.

B. Loose or dirty

thermocouple

connection at gas valve.

Clean and/or tighten the thermocouple fitting at the connection to the valve.

C. Thermocouple defective.

Check thermocouple with millivolt meter – it should generate approximately 30

millivolts when not connected to a load. When connected to a load, it should generate

approximately 14 millivolts. If below 7 millivolts, replace.

D. Thermomagnet pilot

safety defective

Replace gas valve after above is checked out.

2. Main burner will not

come ON - pilot

burning and

thermostat set for

heat.

A. Gas valve not turned ON

after lighting the pilot.

Turn gas valve knob to the “ON” position - if no main gas flow, proceed to Step. "B".

B. Electric power to furnace

turned OFF.

Check for line voltage at furnace - if okay and no main gas flow, proceed to Step "C".

C. Low voltage transformer

or limit switch defective.

Check for 24 volts at the low voltage terminals of the transformer. If no voltage, turn

OFF electric power to furnace. Remove one wire from the limit switch and check for

continuity across both terminals. No continuity – replace the limit switch. With a good

limit switch back in the circuit and the electric power turned ON - if no voltage, replace

transformer.

NOTE: Before replacing the transformer or limit switch, check wiring for loose

connections or broken wires and repair as needed. If voltage is present at transformer,

proceed to Step "D".

D. Wall thermostat

defective.

With thermostat set for heat (contacts closed) check for voltage at the terminals on

gas valve. If no voltage is present replace defective thermostat.

NOTE: Before replacing thermostat, be sure to check the wiring from the furnace to

thermostat for loose connections or broken wires and replace as needed.

If voltage is present at the terminals on gas valve and still no gas flow to main burners,

proceed to Step "E".

E. Burner orifice plugged.

Clean or replace the orifice - if okay and still no gas flow to main burners, proceed to

Step "F".

F. Gas valve defective.

Replace defective gas valve.

3. Burner comes "ON"

but goes OFF before

blower turns ON.

A. Defective wiring.

Turn OFF electric power to the furnace. Remove the top front panel, fan shroud and

blower wheel. Refer to Wiring Diagram and check all wiring inside the junction box.

Remove center front panel and check all wiring inside switch box containing fan, limit

and selector switches. Correct if necessary. If correct, proceed to Step "B".

NOTE: Selector switch used only on Models 5507331, 5507332, 6007731 &

6007732.

B. Defective limit switch.

If the burner goes OFF in less than five minutes from room temperature start, check

the limit control switch. If detective, replace.

NOTE: Blower should turn "ON" within three minutes after burner is "ON" from a room

temperature start. If not, proceed to Step "C”.

C. Defective motor (2-

speed).

Jumper across the fan switch, turn electric power ON, the motor should rotate. If a 2-

speed motor is used - jumper from "brown" terminal on the fan switch to #2 (red)

terminal on the selector switch, motor should rotate on "LOW" speed. Jumper from

same "brown" terminal on the fan switch to #3 (black) terminal on the selector switch,

motor should rotate on "HIGH" speed. Replace motor if defective.

D. Defective motor (1-

speed).

Jumper across the fan switch, turn electric power ON, motor should rotate. Replace

motor if detective.

E. Detective fan switch.

If, after checking the above possibilities, problem still exists, replace the fan switch.

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Williams 6007731 Owner's Manual Page 44

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