State Industries SHE50-100NE Control System Unresponsive, UIM Display Is Blank, UIM is Inoperable

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL

CONTROL SYSTEM UNRESPONSIVE

DISPLAYED MESSAGE	CHECK/REPAIR
CONDITION/INDICATES
UIM Display Is Blank	• Ensure the on/off switch is on and working -
	replace switch if defective.
On/Off is turned off	• Check communication cable connections at
Water heater is not plugged in	UIM’s J2 Socket (page 27) and the CCB’s J16
Tripped Breaker - Blown Fuses	Socket (page 36). Secure power and install a
120 VAC power supply problems	new comm cable. (standard Cat 5 network
24 VAC power supply problems	cable).
Defective transformer	• Closely inspect communication ports on CCB
Wiring or plug/socket connection problems
	and UIM for damage or wear.
UIM communication cable problems
	• Ensure 120 VAC power is properly connected in
Important Service Reminder:
	the junction box on the back of the water heater.
When performing any troubleshooting steps outlined	• Ensure 120 VAC is supplied to CCB’s J3 Socket
	pins 1 & 3. Hot wire to pin 1, neutral wire to pin 3
in this service manual always consider the wiring
	(page 36).
and connectors between components. Perform a
	• Check 120 VAC to transformer primary winding
close visual inspection of all wiring and connectors
to a given component before replacement.	at CCB’s J1 socket pins 1 & 3 (page 36) with J1
Ensure wires were stripped before being crimped in	plug removed, power on.
	• Check J1 plug and J1 socket on the CCB for
a wire connector, ensure wires are crimped tightly in
	wear or damage. Ensure plugs and sockets are
their connectors, ensure connection pins in sockets
	mating properly and providing good contact.
and plugs are not damaged or worn, ensure plugs
	• Check for 24 VAC from transformer secondary
and sockets are mating properly and providing good
contact.	winding at CCB’s J1 socket pins 4 & 5 with J1
	plug inserted, power on. If 24 VAC is not present
Failure to perform this critical step or failing to	AND the two checks above were performed and
perform this step thoroughly often results in	the results were successful - replace the trans-
needless down time, unnecessary parts	former. Check all wiring for shorts before power-
replacement, and customer dissatisfaction.	ing up the new transformer.
	• Call the technical support phone number shown
	on the water heater labeling for further assis-
	tance if the problem has not been corrected
	after performing the procedures outlined here.
UIM is Inoperable	• Ensure Ribbon Cable from the Button overlay is
	inserted correctly in UIM J3 Socket (page 27).
UIM does not respond to any user input using the	• Call the technical support phone number shown
operational and/or Up and Down buttons.	on the water heater labeling for further assis-
Water heater may be maintaining water temperature	tance if the problem has not been corrected
	after performing the procedures outlined here.
at the last saved setting or may not be operating at
all.

Technical Literature Department	42 of 52	Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent