Gas-Fired Products 175, N7/L7, 100, 40, 150, 200 Replace air switch Restart Troubleshooting Yes

Form #43343530 July 08

			Clean blower wheel.		Replace air switch
			Restart
			troubleshooting.
			No		Yes
Does the amber light	Does LED on the	Check the air intake	Remove blower is the		Check the pressure	Repair or replace	Replace blower
stay on until the	ignition module flash	and vent are there	wheel free from dirt		across the air switch	jumper check all wire	assembly.
thermostat turns off?	No once?	Yes any blockages?	No and dust?	Yes	during hot running is	terminals.
					it higher than the
					minimum required?

No

Does LED on the ignition module flash three times?

Yes

Check the gas supply pressure with all the heaters on. Does it stay above the minimum required?

		Yes
	Contact factory for	Remove blockage.
	assistance.	Restart
No		troubleshooting.
	Check gas pipe
	sizing, regulators and
No	system supply gas
	pressures.

No

Check turbulator, are the correct number of lengths installed?

No

Change number of turbulators.

	No	No
	Check vent and fresh	Remove blower does
		the wheel turn freely?
	air lengths, are they
		Yes
Yes	within the maximum
	permissible?

Yes
Check air plate	Replace air plate.
stamped part
numbers. Are they	No
correct?

–45–

Yes

After an initial step opening is the manifold gas pressure correct?

No

Adjust manifold pressure. Restart troubleshooting.

	Remove burner	Is the heater properly
	casting and check	grounded?
Yes	the orifice. Is it clean	Yes
	and free from
	blockage?
	No	No
	Remove blockage.	Correct grounding
	Restart	problem.
	troubleshooting.

					Yes
	Check the micro		Contact factory for	Replace flame sense	Contact factory for
	Amps at the FC-FC+		assistance.	wire.	assistance.
Yes	terminals of the	Yes
	module is it greater
	than 0.7µA with flame.
	No			No
	Check the terminal on		Remove and inspect	Check flame sense	Contact factory for
	the flame sense		flame sense	wire does it have	assistance.
	electrode, is it tight?	Yes	electrode. Is it clean	Yes continuity?	Yes
			and the ceramic
			intact?

Yes	No	No
Troubleshoot Ends	Adjust terminal	Repair or replace	Tighten terminals.
	connection. Restart	flame sense	Restart
	troubleshooting.	electrode.	troubleshooting.
			No

Troubleshooting continued from previous page

Replace gas valve.	Adjust spark gap	Replace electrode.	Are the terminals tight		Is there are spark to		Remove and re-insert
	carefully. Restart		on the electrode and		the side of the burner		electrode. If it still
	troubleshooting.		the ignition module?	Yes	cup?	Yes	sparks to the side.
							Replace electrode.

Has all the air been	Is the LED on the
purged from the gas	ignition module
supply lines?	Yes steady on?
No	Yes
Purge the gas supply	Replace ignition
lines.	module.

Check the inlet pressure to the gas

No valve. Is it between the minimum and maximum for the gas pressure?

No

Adjust manifold gas pressure.

	Yes	No
	Check the manifold
		Check electrode
	gas pressure during
		spark gap. Is it 1/8”?
	start up. Is it zero
Yes		Yes
	inches w.c?
	No	Yes
	After an initial step	Remove burner and
	opening is the	check the orifice. Is it
	manifold gas pressure	Yes clean and free from
	correct?	blockage?
	No	No
	Adjust manifold	Remove blockage.
	pressure. Restart	Restart
	troubleshooting.	troubleshooting.

Yes		No
Remove spark		Turn off gas and
		check for spark. Is
electrode and
		there a spark to the
inspect, is the	No
		throat of the burner
ceramic cracked or
		cup?
loose?
		Yes
Contact factory for		Check nameplate are
assistance.		the gas type, orifice
	No	and airplates correct
		for the stated burner
		specification?
		Yes
		Contact factory for
		assistance.

No
Check the terminal at		Carefully bend the
the electrode does it		terminal away from
arc to the burner	Yes	the burner casting.
casting?		Restart
		troubleshooting.

No

Replace flame sense wire ignition cable. If problems persist contact factory for assistance.