Wing Enterprises IOMWDF-1 Section VII Troubleshooting, System without Pilot Symptom Cause Remedy

SECTION VII – TROUBLESHOOTING

System without Pilot

Symptom		Cause		Remedy
A. If blower does not operate.	1.	Low or no voltage.	1.	Check power source.
	2.	Fuse(s) blown.	2.	Check and replace.
	3.	Customer interlock not closed	3.	Close or connect customer
		or connected.		interlock.
	4.	Fan Off-On switch in Off position.	4.	Switch to On position.
	5.	Time clock, night setback thermo-	5.	Check time clock, night setback
		stat or field installed controls		thermostat and field installed
		open.		controls for proper settings.
	6.	Freeze protection tripped.	6.	Reset freeze stat by interrupting
				power. Check for proper setting
				and burner operation.
	7.	Damper motor not operating, or	7.	Check for power at damper motor
		its end switch not making.		and that end switch has been wired
				correctly to the N.O. (normally
				open) contact. Check that the
				linkage is clear and not binding.
	8.	Overload protection on motor	8.	Push reset button on starter and
		starter tripped.		check amps.
	9.	Belts loose or broken	9.	Turn power off and check belts.
	10.	Bearings seized.	10.	Check and replace.
	11.	Motor may be burned or incor-	11.	Turn power off and check motor
		rectly wired.		and wiring.
	12.	Motor overheating.	12.	Check burner firing rate.
B. If there is no voltage at ignition	1.	Heat Off-On switch in Off	1.	Switch to On position.
control.		position.
	2.	Burner enable relay open	2.	Check for power and replace if
		(if applicable).		necessary.
	3.	Outside air temperature higher	3.	Lower On-Off inlet ductstat
		than On-Off inlet ductstat		setting.
		(if applicable).
	4.	Field purge timer open	4.	Check for power and replace if
		(if applicable).		necessary.
C. Burner does not light after 5 sec-	1.	Manual gas shut-off valve closed.	1.	Slowly open valve.
onds pre purge of flame safeguard	2.	Inlet gas pressure lower than	2.	Increase gas pressure.
relay and there is voltage at igni-		required gas pressure.
tion control.	3.	Type of gas (Natural, LP) supplied	3.	Replace with factory required
		different from factory required		type of gas.
		type.
	4.	Auxiliary switch on starter not	4.	Check for power and replace if
		closed.		necessary.
	5.	Air flow switches not closing.	5.	Adjust the air flow and external
				static pressure to match rating
				plate.
	6.	High temperature limit switch	6.	Correct problem. Reset by pushing
		open.		down the reset button.
	7.	High or low gas pressure switches	7.	Correct problem. Reset both
		open (if applicable).		switches.
	8.	Main gas valve relay open.	8.	Check for power and replace if
				necessary.

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