Gas-Fired Products PTS Series, PTU Series manual Troubleshooting Guide, Form #43343330 May

Form #43343330 May 08

Turn on line voltage	Does the blower
and thermostat. Does	come on?
the red monitoring	No
light come on?
	No
	Is 120V at the terminal
	block in the blower?	No
	Yes
	Is there 120V
	between ground and
	the L1 terminal on the	No
	module?
	Yes
	During start up, is
	there 120V between
	ground and the IND
	terminal on the
	module?
	Yes
	Disconnect the power
	and check the blower
	wheel. Does it turn	No
	freely?

	Does the LED on the		Is the black tap on the		Check the probes and		Replace air switch.
	ignition module flash		air switch connected		hoses to the air switch
Yes	once?	Yes	to the upper probe?	Yes	are they clear and	Yes
					unobstructed?
	No		No		No
Check line voltage at	Check NO terminal of		Switch hoses on the		Clean out hoses and
thermostat and line	the air switch		pressure taps.		probes.
voltage circuit. Repair	connection. Replace
fault.	red light.
Check terminals for			Check terminals for		if fuse carrier is tight			Check TISS wire for
continuity and repair.			continuity at		and the fuse has no			a break if it is close to
			transformer. If they		continuity, replace the			the terminal repair.
			are good, replace		fuse.			Otherwise replace
			transformer.					TISS wire.
			No		No			No
	Is the LED on the		Is there 24V between		Is there 24V on the		Is there 24V between	The TISS has broken	Replace heat
	ignition module		the inlet to the fuse		other side of the fuse		both terminals of the	continuity. Check the	exchanger tube,
No	steady ON?	No	carrier and the	Yes	carrier?	Yes	TISS and ground? No	first tube and reflectorYes	reflector and TISS.
			ground?					is there a hole?
	Yes						Yes
Remove any	Replace ignition		Check that red wire is		Is 120V at the terminal		Is there 24V between
obstructions. Repeat	module.		connected to TH from		block in the blower?		both terminals of the
start up. If motor will			air switch terminal C.	No		Yes thermostat connection
not run. replace			Repair connection.				and ground?

motor.

22.0) TROUBLESHOOTING GUIDE

–43–

Yes

Replace motor.

Yes

Is the blower on? Does the LED on the ignition module flash

No once?

Yes

Move black light wire to NO terminal of the air switch. Restart the troubleshooting.

Yes
Does the amber light	Is the LED on the
come on?	ignition module
	No steady ON?

No

No

Is the orange wire from PSW connected

to the NO terminal of Yes the air switch?

No

Move orange wire to NO terminal. Restart troubleshooting.

After 15 seconds post purge is there

24V between V1 and Yes

V2 ignition module terminals?

Remove jumper, air switch must be open circuit first for blower to operate.

Yes

Are air switch terminals jumpered?

No

Air switch is stuck in the closed position. Replace air switch.

Are the blue wires secure in the terminals and firmly on the ignition module terminals?

Yes	No
Replace ignition	Does the system have	Repair or replace
modules.	a 24V individual	jumper check all wire
	thermostat?	No terminals.
	Yes
	Repair or replace
	thermostat. Check
	external wiring.

	Are the black wires	Replace amber light.
	to the amber light	Restart
Yes	securely on the gas	Yes troubleshooting.
	valve terminals?

Yes	No	No	No
Replace ignition	Replace ignition	Repair connection.	Repair connection.
module.	module.	Restart	Restart
		troubleshooting.	troubleshooting.

Yes

Troubleshooting continued on the next page.