American Water Heater Condensing UltraLow NOx Indoor 120000 BTU Liquid Propane GT140PIH User Manual

41  Page
MAINTENANCE AND SERVICE
•	Clean the cold-water inlet filter (Refer to the Unit Draining and Filter Cleaning Section on 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...

42  Page
DESCALING THE UNIT
Hard water is a severe problem for the copper coils inside heat exchangers  Heat exchanger failure due
to scale buildup from hard water conditions is NOT covered by warranty  It is highly suggested that a
scale inhibitor be installed before the cold water inlet after this procedure is done
1) TOOLS - Gather the following materials:
 a Pump: The pump should provide a minimum of 1
     gpm through the heater 
 b Descaling Solution
 c Water hoses...

43  Page
TROUBLESHOOTING
GENERAL
PROBLEMSOLUTIONS
TEMPERATURE and AMOUNT OF HOT WATER
It takes a long time to 
get hot water at the 
fixtures
•	The time it takes to deliver hot water from the water heater to your 
fixtures depends on the length of piping between the two  The longer 
the distance or the bigger the pipes, the longer it will take to get hot 
water
•	If you would like to receive hot water to your fixtures quicker, you may 
want to consider a hot water recirculation system...

44  Page
PROBLEMSOLUTIONS
WATER HEATER
Unit does not ignite 
when water goes 
through the unit
•	Is the power on the water heater?
•	Is the gas on?
•	Is the flow rate over 05 GPM (19 L/min)? (p 37)
•	Is the filter on cold water inlet clean? (p 41)
•	Check for reverse connection and cross connection (p 22)
•	If you use the remote controller and/or temperature controller, is 
the power button turned on? (p 37 and 38)
•	Check if the inlet temperature is too high
The fan...

45  Page
Error code
Green LEDError code indicator on the temperature controller attached to a surface of the 140 Indoor (T-H3M-DV) model and the remote controller 9009069005 (TM-RE42).
ERROR CODES
-General-
•	The water heater has self-diagnostics for safety and convenience when troubleshooting
•	If there is a problem with the water heater itself, or the installation of the unit, the error code will be 
displayed on the temperature controller and remote controller
•	Consult with the table on the...

46  Page
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 if the gas type of the water heater matches 
the gas supplied to it
•	Check if there is any blockage in the intake air and/
or exhaust
•	If the water heater is installed as a direct-vent 
system, check whether there is enough distance 
between the intake air terminal and the exhaust...

47  Page
RemoteGreen 
LED
Malfunction
descriptionDiagnosis
391Two TimesAir-fuel ratio rod 
failure
•	Check for connection/breakage of wires (Part #708) 
and/or soot on the AFR rod (Part #108)
510Six TimesAbnormal main gas 
solenoid valve
•	Check for connection/breakage of wires (Part #707) 
and/or burn marks on the computer board (Part #701)
•	Check for signs of vent corrosion
•	Check gas valve contacts and gas valve wire harness 
connections for signs of rust or corrosion
551Six...

48  Page
Case assembly
Temperature 
remote controller
Indoor modelOutdoor model
702
704
052
052
052
006
704
005
052
004
004
001
007
003
050002
001714
002
Temperature controller
Indoor model
COMPONENTS DIAGRAM
Components Diagram
Owner's Guide
723
722
721
056
721724  

49  Page
Computer board assembly
Surge box assembly
709
710
103
708
402
707701
711
716
402
407
408
060713706
for
Indoor model
forOutdoor model
701
710
703
120
053
705
712
712
Components Diagram
Owner's Guide  

50  Page
Burner assembly
101
401
116
053
117
103
105
064
054
104
115053
053
106
107
108
708
110
061109111709112053
114
113707
102
053
120
709
150
057
055062
053711
117
055
119
151
118
051
Manifold 
assembly
Burner assembly
Components Diagram
Owner's Guide