OWNER’S MANUAL

TROUBLESHOOTING

Note: All troubleshooting items are listed in order of operation.

WARNING: Turn off and unplug furnace and let cool before servic- ing. Unless you need gas supply for testing, shut off equipment shutoff valve before servicing. Only a qualified service person should service and repair furnace.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

No heat

1.

Thermostat off

1. Check to be sure thermostat is calling for heat.

 

 

 

 

Wire to thermostat could be off terminal

 

2.

Gas supply

2. Be sure equipment gas valve is in the open posi-

 

 

 

 

tion (level or parallel to gas line)

 

3. Electrical connections and power

3. Be sure all electrical connections are secure

 

4.

Motor

4.

Motor must be operating at top speed before

 

 

 

 

burner will come on. If blower is not operating

 

 

 

 

at top speed, check voltage supply (minimum

 

 

 

 

100 volts A.C.). If voltage supply is okay, check

 

 

 

 

for defective motor

 

5.

Malfunctioning microswitch

5. Be sure the microswitch is sailing in far enough

 

 

 

 

to open the solenoid valve and to energize the

 

 

 

 

ignition control. If the switch is not sailing in,

 

 

 

 

clean any dust or dirt from the actuator pin. Other

 

 

 

 

reasons for the switch not sailing in are

 

 

 

 

A. Insufficient blower speed - Slow motor due to

 

 

 

 

faulty motor or lint and dust accumulation on

 

 

 

 

the blower wheels or restriction of return air to

 

 

 

 

the furnace

 

 

 

 

B. Faulty microswitch - Replace switch if cir-

 

 

 

 

cuit to ignition control is not completed when

 

 

 

 

switch is manually engaged. Switch should

 

 

 

 

also be replaced if blower motor running at

 

 

 

 

top speed fails to engage switch within six or

 

 

 

 

seven seconds. Note: To service switch, com-

 

 

 

 

bustion chamber must be pulled out. Follow

 

 

 

 

steps 1, 2, 3, 9 and 10 on page 8 to remove

 

 

 

 

combustion chamber

 

6.

Gas valve

6.

Within 20 seconds after motor reaches 75% of

 

 

 

 

its r.p.m. and microswitch engages, check the

 

 

 

 

following:

 

 

 

 

A. Voltage at valve - If current is present but

valve is not opening, check wire connections B. If wire connections okay - Replace valve C. No voltage at valve - Check circuit completion

through microswitch and limit switch as well as wiring and wire connections. If no defects are found, see Ignition Failures, page 16

Continued

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Williams 4003531, 2503531 installation manual Troubleshooting, Observed Problem Possible Cause Remedy
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