NuTone IM-440 Series Make separate cable IW-6 runs from each Remote Station to

INSTALLER’S TROUBLESHOOTING GUIDE

TROUBLE	POSSIBLE CAUSE	POSSIBLE REMEDY
System squeals when using	Shorted wire on master or	Check for short between terminals or loose wire.
intercom.	remote terminal board.
	Two or more Remote Stations on	Make separate cable (IW-6) runs from each Remote Station to the
	same wire run to Master.	Master.
	Speakers in adjacent rooms	If speakers are mounted directly back to back, one speaker will have
	mounted on common wall, or	to be relocated. If speakers are in a common wall, try placing
	mounted back to back.	fiberglass insulation behind each speaker, or isolate the speakers
		from the wall by placing rubber washers or weather stripping between
		speaker and wall.
	Improper wire used in	NuTone Model IW-6 6-conductor twisted pair cable must be used.
	installation.
Hum in speakers.	Intercom wiring run too close to	Keep intercom wiring as far as practical from household AC power
	household AC power wiring.	wiring. Do not run intercom wiring parallel to AC power wiring.
	Shorted intercom power wiring or	Check power connections to Master and connections to transformers.
	power wiring shorted to ground.
	Interference from household	A dimmer may cause interference. For dimmer and fluorescent
	electrical fixtures.	lighting interference, use filters (G.E. 89G635 or equivalent;
		NuTone Part No. 1559A-000).
Static.	Loose ground connection.	Check ground connection to Master and connection to earth ground
		source.
	Interference from household	A dimmer may cause interference. For dimmer and fluorescent
	electrical fixtures.	lighting interference, use filters (G.E. 89G635 or equivalent;
		NuTone Part No. 1559A-000).
	Interference from household	Correct interference at the source: fish tank, heater, hand tool, coffee
	electrical appliances.	pot, etc.
Remote Station not working.	Wire installation.	Check terminal board for broken wire or loose connection. Check
		continuity of wire.
	Speaker.	Check continuity of speaker. Clean switch controls. Substitute with
		speaker known to be in working order.
No door communication.	Wire installation.	Check continuity of wiring. Check connections at speaker and Master.
	Speaker.	Check with a speaker known to be in working order.
Optional Electronic Chime	Wire installation.	Be certain the chime is properly connected to the master station. Also,
(Models IA-28 or IA-29) does		be certain the front, side and rear buttons are properly connected to
not operate or operates at a		the chime board.
low level.
	Improper volume setting.	Adjust the volume of the chime module by turning the volume
		potentiometer located on the chime module. NOTE: Chime Audio will
		NOT be heard at stations selected to the OFF or MONITOR.
Electronic chime can't be	Improper volume setting.	Be certain the electronic chime is properly connected to the master
heard through the master		station's electronic chime input screw terminals.
station or remote speakers.
	Improper volume setting.	Adjust the volume of the electronic chime by turning volume
		potentiometer located on the chime.
		-Continued-

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