American Water Heater NonCondensing UltraLow NOx Outdoor Natural Gas GT110UNE user manual

41    Page
MAINTENANCE AND SERVICE
•	Clean the cold-water inlet filter. (Refer to Unit draining and filter cleaning section in this page.)
•	Be sure that all openings for combustion and ventilation air are not blocked.
•	The venting system should be checked annually for any leaks, corrosion, blockages or damage.
•	The burner should be checked annually for dust, lint, grease or dirt.
•	Keep the area around the water heater clear.  Remove any combustible materials, gasoline or any 
flammable vapors and...

42  Page
WATER CONNECTIONS
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for 
potable water systems.
1. A manual shutoff valve must be installed on the cold water inlet to the water heater between the main 
water supply line and the water heater.
2. In addition, a manual shutoff valve is also recommended on the hot water outlet of the unit.  If the 
water heater is installed within, or subjected to, a closed loop water system, a thermal expansion...

43  Page
PROBLEMSOLUTIONS
WATER HEATER
Unit does not ignite 
when water goes 
through the unit.
•	Is the flow rate over 0.5 GPM (1.9 L/min)? (p. 36)
•	Check for the filter on cold water inlet. (p. 41)
•	Check for reverse connection and cross connection.
•	If you use the remote controller, is the power button turned on?
•	Check if the inlet temperature is too high.
The fan motor is 
still spinning after 
operation has stopped.
•	This is normal.  After operation has stopped, the fan motor keeps 
running...

44  Page
ERROR CODES
-General-
•	The units have self-diagnostic function for safety and convenience when troubleshooting.
•	If there is a problem with the installation or the unit, the error code will be displayed on the remote 
controller.
•	Consult with the table on the following pages for the description of each error code.
-Single unit Installations-
Example: If your unit has the “321” error code (which signifies an inlet thermistor failure)
•	Remote controller 9009069005 (TM-RE42): “321” will be...

45  Page
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the water heater or remote controller, please 
check the following.  After checking, consult with the manufacturer.
Troubleshooting
Owner's Guide
RemoteGreen
 LED
Malfunction
descriptionDiagnosis
031One TimeIncorrect DIPswitch 
setting
•	Check the DIPswitch settings on the PCB (Part #701).
101Five TimesWarning for the 
“991” error code 
•	Check the gas type of the water heater.
•	Check if there is any...

46  Page
Troubleshooting
Owner's Guide
RemoteGreen 
LED
Malfunction
descriptionDiagnosis
391Two TimesAir-fuel ratio rod 
failure
•	Check for connection/breakage of wires (Part #709) 
and/or soot on the AFR rod (Part #108).
441Two TimesFlow sensor failure 
(Easy-Link System 
only)
•	Check for connection/breakage of wires and/or 
debris on the flow sensor impeller (Part #402).
510Six TimesAbnormal main gas 
solenoid valve
•	Check for connection/breakage of wires (Part #708) 
and/or burn marks on the...

47  Page
COMPONENTS DIAGRAM
Indoor modelOutdoor model
Case assembly
Temperature remote controller
721
001
004
052003
052
007
002
051
050
052
005
704
002
001
702
704
006
717
Components Diagram
Owner's Guide  

48  Page
510U (T-D2U) model
703
121
705
053
706
704
705
110U (T-KJr2U) and
310U (T-K4U) models
701705
103
402
402
715
707
715
403
714
709
708
711
705
103
709
402
402
711
707
714
407
408
708
716716
701
061
Computer board assembly
Surge box assembly
Components Diagram
Owner's Guide  

49  Page
Components Diagram
Owner's Guide
Burner assembly
113
114
150
057119
151
118055
401
401
153
154
053
152
713
056
107106
108
060
109
111711
112
052
101
401
116
116
115
110
053
053
062
060
122053
060
060
104
105
123
708
711
711
117
719
052
055
053
054
102
709
714
063
707
103
062
720
117
Burner assembly
Manifold 
assembly
Exhaust section (Outdoor model)  

50   Page
Components Diagram
Owner's Guide
Water Way assembly
463
413453
451
403
456
460
458
462
450414
459
454
402460456
461
458404
415
407
454
405
457
406
410455
408456454
460
409
C
452
411
414
451414
412
058
401
BA
B
A
D
052059
D
C
Bypass section
(510U (T-D2U)model)
510U (T-D2U)
     model
Water outlet section
Water inlet section
To Water
inlet section
To Water
outlet section