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 
flammable vapors and liquids
•	In accordance with all local codes and common safety practices, water discharged from the pressure 
relief valve can cause severe burns instantly from scalding   DO NOT touch the pressure relief valve
•	If the relief valve discharges periodically, it may be due to thermal expansion in a closed water supply 
system  Contact the water supplier or local plumbing inspector on how to correct this situation
•	Visual check of burner flames (see below) through the burner window in the burner assembly located 
at the middle of the water heater
The manufacturer recommends having the water heater checked once a year or as necessary by a licensed 
technician  If repairs are needed, any repairs should be done by a licensed technician
UNIT DRAINING AND FILTER CLEANING
Turn off the electrical power supply and close the manual gas shutoff valve 
and the manual water control valve before servicingWARNING
Satisfactory
Blue	flame
Unsatisfactory
Flame blowing up
Unsatisfactory
Red or Yellowflame
1. Close the manual gas shutoff valve
2. Turn off power to the water heater and wait a couple of 
seconds Turn on again
3. Wait 30 seconds, and then turn off power to the water 
heater, yet again
4. Close the water shutoff valve
5. Open all hot water taps in the house  When the residual 
water flow has ceased, close all hot water taps
6. Have a bucket or pan to catch the water from the water 
heater’s drain plugs  Unscrew the Small drain plug first 
and unscrew the Large drain plug next to drain all the 
water out of the water heater 
7. Wait a few minutes to ensure all water has completely 
drained from the water heater 
8. Clean the filter: Check the water filter located within the 
cold inlet  With a tiny brush, clean the water filter of any 
debris which may have accumulated and reinsert the filter 
back into the cold water inlet
9. Securely screw the drain plugs back into place 
     Hand- tighten only
Water valve
Gas valveDrain plug(Small)
Drain plug with Filter (Large)
Normal Operation
Owner's Guide  
						

							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
 d Bucket
2) SETUP  -
 a Set the unit to its highest temperature setting
 b Open multiple hot water fixtures to run 
     a large volume of water through the water 
     heater   Allow the unit to run at its full 
     firing rate for at least 2 minutes
 c While the water heater is still firing, disconnect 
     power to the water heater 
 d Shut off all the open hot water fixtures
3) WATERLINES – Assuming isolation valves with drain 
     ports are installed
 a Isolate the water heater by closing the incoming/
     outgoing water isolation valves C and D 
 b Relieve pressure within the water heater by 
     temporarily opening up the pressure relief valve
 c Drain the water heater and connect hoses/pump to the 
     drain ports of the isolation valves: Outlet of the
     pump to valve B (cold side), and another hose from valve A (hot side) to the bucket
4) PUMP and DESCALE –
 a Fill the bucket with 5 gallons of diluted solution  Dilution ratio depends on the
     cleaning/descaling solution used
 b Place the pump into the bucket if it is submersible, or use an inlet hose into the bucket if it is   
     not submersible
 c Open valves A and B
 d Circulate descaling solution through the water heater for 45 minutes or until return water is
     cleared
5) CLEANSE THE SYSTEM – Flush the chemicals out of the heat exchanger with fresh water 
 a Close valve B
 b Open valve D and run fresh water through the water heater and drain out of Hose 2 for 15 minutes
 c Close all valves, relieve pressure from the water heater with the pressure relief valve, and 
     clean the inlet water filter with fresh water 
 d Once the water heater is flushed and cleansed, replace the water filter, open C and D, and 
     reconnect power to the water heater 
 e Change the temperature setting back to the desired temperature
Normal Operation
Owner's Guide
Isolation Valve
Water
Heater
HC
Gas SupplyIsolation
 Valve
Pressure Relief Valve
Hose 1
Pump
Inlet Hose(may or may not be needed,depending on type of pump)
Hose 2
Descaling Solution
A
B
CD  
						

							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 (p 29)
The water is not hot 
enough
•	Compare the flow and temperature  See the charts on p 54
•	Check cross plumbing between cold water lines and hot water lines
•	Is the gas supply valve fully open? (p 31)
•	Is the gas line sized properly? (p 21)
•	Is the gas supply pressure sufficient? (p 20 and 22)
•	Is the set temperature set too low? (p 37 to 39)
The water is too hot•	Is the set temperature set too high? (p 37 to 39)
The hot water is not 
available when a 
fixture is opened
•	Make sure the unit has 120 VAC, 60 Hz power supply 
•	If you are using the remote controller and/or temperature controller, is 
the power button turned on?
•	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
•	Is the gas supply valve fully open? (p 31)
•	Is the water supply valve fully open? (p 31)
•	Is the filter on cold water inlet clean? (p 41)
•	Is the hot water fixture sufficiently open to draw at least 05 GPM 
     (19 L/min) through the water heater? (p 37)
•	Is the unit frozen? (p 40)
•	Is there enough gas in the tank / cylinder? (For Propane model)
•	Is it plumbed backwards with reverse plumbing?
The hot water turns 
cold and stays cold
•	Is the flow rate enough to keep the water heater running? (p 37)
•	If there is a recirculation system installed, does the recirculation line have 
enough check valves? (p 29)
•	Is the gas supply valve fully open? (p 31)
•	Is the filter on cold water inlet clean? (p 41)
•	Are the fixtures clean of debris and obstructions?
Fluctuation in hot 
water temperature
•	Is the filter on cold water inlet clean? (p 41)
•	Is the gas line sized properly? (p 21)
•	Is the supply gas pressure sufficient? (p 20 and 22)
•	Check for cross connection between cold water lines and hot water lines
Troubleshooting
Owner's Guide  
						

							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 motor is 
still spinning after 
operation has stopped
•	This is normal  After operation has stopped, the fan motor keeps 
running from 15 to 70 seconds in order to re-ignite quickly, as well 
as purge all the exhaust gas out of the flue
Abnormal sounds from 
the water heater 
•	Is the correct gas type of a water heater installed? (p 6)
•	Are the DIPswitch settings for your altitude set correctly? (p 28)
•	Check the flame quality  (p 41)
•	Is the intake or exhaust vent blocked? (p 10)
•	Is the vent length and diameter correct? (p 11 to 16)
•	Is the manifold pressure set correctly? (p 4)
Unit sounds abnormal 
while in operation
•	Contact the manufacturer at 1-877-737-2840
Remote controller
Controller does not 
display anything when 
the power button is 
turned on
•	Make sure the water heater is supplied with power 
•	Make sure the connection to the water heater is correct (p  26 and 
27)
NOTICE:
When the water heater has not operated for five minutes or more, 
the display of the controllers turns off to conserve energy 
An ERROR code is 
displayed
•	Please see p 45 to 47
When the remote 
controller is turned 
ON, STAND BY LED 
is lit
Troubleshooting
Owner's Guide  
						

							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 following pages for the description of each error code
Example: If your unit has the “321” error code (which signifies an inlet thermistor failure)
•	Indicator on the controller : “321” will be displayed on the screen in its entirety
•	Green LED on the computer board: The green LED on the computer board will be
                                                                 blinkin\
g two times
Troubleshooting
Owner's Guide  
						

							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 
terminal
•	Check the altitude/elevation of area of where the 
water heater is installed and match the appropriate 
DIPswitches
•	Check if there is grease and/or dirt in the burner (Part 
#101) and the fan motor (Part #103), especially if the 
water heater has been installed in a contaminated area
•	Check if the DIPswitches match gas type of the water 
heater
•	Check the manifold pressure at Max and Min
•	Check combustion chamber tube (Part #117) to make 
sure it is clear and securely installed
111Three TimesIgnition failure•	Check if the Hi-limit switch (Part #411) is properly 
functioning
•	Check for connection/breakage of wires (Part #412, 707, 
708, 709 710), burn marks on the computer board (Part 
#701), and/or soot on the flame rod (Part #108)
•	Check if there is a buzzing spark ignition sound 
coming from the burner (Part #101) when water 
heater prepares for combustion
•	Listen for the double “clunk” sound coming from gas 
valve assembly (Part #102) when the water heater 
goes into combustion
•	Check if there is leaking from heat exchanger (Part #401)
•	Check that the gas is turned on
•	Check gas supply 
121Three TimesLoss of flame•	Check if the Hi-limit switch (Part #411) is properly 
functioning
•	Check for connection/breakage of wires (Part #412, 
707, 708, 710), burn marks on the computer board 
(Part #701), and/or soot on the flame rod (Part 
#108)
•	Check if there is leaking from heat exchanger (Part #401)
•	Check gas supply
311Two TimesOutlet thermistor 
failure
•	Check for connection/breakage of wires and/or 
debris on thermistor (Part #407, 408, 715)
•	Check the resistance
321Two TimesInlet thermistor 
failure
341Two TimesExhaust thermistor 
failure (Indoor 
model only)
Troubleshooting
Owner's Guide
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the water heater or remote controller and/or 
temperature controller, please check the following  After checking, consult with the manufacturer  
						

							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 TimesAbnormal gas 
solenoid valve
•	Check for connection/breakage of wires (Part #707) 
and/or burn marks on the computer board (Part #701)
•	Check gas valve contacts and gas valve wire harness 
connections for signs of rust or corrosion
611Four TimesFan motor fault•	Check for connection/breakage of wires, dust buildup 
in the fan motor (Part #103) and/or burn marks on 
the computer board (Part #701)
•	Check for frozen/corrosion of connectors (Part #103)
701One TimeComputer board fault•	Check for connection/breakage of wires (Part #711)
711One TimeGas solenoid valve 
drive circuit failure
•	Refer to the 111 and 121 error codes
721Six TimesFalse flame 
detection
•	Check if there is leaking from heat exchanger (Part #401)
741N/AMiscommunication 
between water 
heater and remote 
controller
•	Check the model type of the remote controller
•	Inspect the connections between the water heater 
and remote controller
•	Check the power supply of the water heater 
751N/AMiscommunication 
between water heater 
and temperature 
controller (Indoor model only)
•	Inspect the connections between the water heater 
and temperature controller
•	Check the power supply of the water heater 
941Five TimesAbnormal exhaust 
temperature (Indoor model only)
•	Check to see of the exhaust temperature is higher 
than 149°F (65°C)
991Five TimesImperfect 
combustion
•	Check if the gas type of the water heater matches 
the gas supplied to it
•	Inspect the environment around the water heater  
Determine how long the water heater has been 
installed and match DIPswitches
•	Check the altitude/elevation of the area of where 
the water heater is installed
•	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 
terminal 
•	Check if there is grease and/or dirt in the burner (Part 
#101) and the fan motor (Part #103), especially if the 
water heater has been installed in a contaminated area
•	Check the DIPswitches match gas type of the water 
heater
•	Check the manifold pressure at Max and Min
•	Check combustion chamber tube (part #117) to see if it 
is clear and securely installed
Troubleshooting
Owner's Guide  
						

							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