Fedders F80A dimensions Warm Air Furnace, CHECK or REPAIR

										WARM AIR FURNACE
TABLE 11: GENERAL TROUBLESHOOTING WHITE-RODGERS INTEGRATED FAN CONTROL
	IF				AND					CHECK or REPAIR
Induced blower			does	2 Flash code does not come on					1.	Induced blower wiring.
not energize									2.	Induced blower.
Induced blower			does	2 Flash code	does	come on			1.	Pressure switch stuck closed.
not energize									2.	Pressure switch is mis-wired or jumpered.
Induced blower is				3 Flash code	does	not	come	on	Wait for the pre-purge to expire.
energized				Induced blower turns off					1.	Pressure switch stuck in the open position.
3 Flash code
comes on									2.	Pressure switch, tubing and wiring.
									3.	Obstruction in furnace venting that is preventing proper combustion airflow.
Pre-purge time has				HSI element	does not		glow	red	1.	Broken or damaged HSI element.
									2.	Broken or damaged HSI element leadwires.
expired				within 10 seconds.
HSI element is			glow-	No other visible control system					Wait for HSI element warm up time to expire.
ing red.				action					1.	Induced blower moving main burner gas away from the HSI element.
HSI element warm up
				Main valve does not light within					2.	Inlet gas pressure too low for main burner ignition.
time has expired and									3.	Input line voltage too low to heat HSI element.
main	valve has		been	trial for ignition period
energized.									4.	HSI element incorrectly positioned.
				Main valve is de-energized at the					5.	Clogged or incorrect main burner orifice.
									1.	Line voltage to L1 terminal of 50V51-250 must be 120 volts with reference to furnace
				end of the trial for ignition period.					2.	chassis.
Main	burner		lights	If main flame is not sensed during						Furnace must be reliably connected to earth ground.
				trial for ignition, system will shut off					3.	Induced blower moving main burner flame away from the flame sensor rod.
within trial for ignition				HSI element and main gas flow,
period.				then go through another purge					4.	Inlet gas pressure too low for proper flame sensing.
				period and initiate another ignition					5.	Flame sensor rod contaminated or in incorrect position.
				trial. A total of 4 ignition			trials	will
				be attempted before the system
Main burner stays on				goes into lockout.
				Circulating fan is not turned on after					1.	Wiring between system control and IFC. Proper operation of 50V51-250 IFC.
after	the end	of the
trial for ignition pe-				30-second time delay.
riod.									1.	Open high limit switch.
Main burner goes out				4 Flash code comes on
before thermostat call									2.	High limit wiring in good condition and securely connected.
for heat ends.									1.
										Induced blower moving main burner flame away from flame sensor rod.
Main burner goes out				4 Flash code does not come on					2.	Pressure switch has opened.
before thermostat call									3.	Flame sensor rod ceramic or leadwire overheated.
for heat ends.									4.	Gas supply / flow reduced or interrupted.
5 Flash code		comes							1.	Open flame rollout switch
									2.	Rollout switch wiring in good condition
on.
									1.	Gas supply off or at too low a pressure to operate furnace.
1 Flash code		comes							2.	Damaged or broken HSI element.	reference to the
									3.	Line voltage to L1 terminal of 50V51-250 IFC must be 120 volts with
on.	1-hour	lockout							4.	furnace chassis.
After										Furnace is not properly connected to earth ground.
reset	delay,	control							5.	Flame rod contaminated or in incorrect location.
will reset and initiate
a new ignition se-									6.	Hot surface element located in incorrect position.
quence if the		call for							7.	Hot surface element or flame sensing rod wiring in good condition and properly con-
heat is still present.
									8.	nected.	within the
										5 flame failures caused by opening limit switch or flame rollout switch,
										thermostat call for heat. Turn thermostat down below room temperature to reset
										control. Check for blocked air filter, closed ducts, etc.

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