A.O. Smith T-H3M-DV Installation Manual And Owner's Manual page 47

Green
Remote
LED
391
Two Times
510
Six Times
551
Six Times
611 Four Times
701
One Time
711
One Time
721
Six Times
741
N/A
751
N/A
941
Five Times
991
Five Times
Malfunction
description
Air-fuel ratio rod • Check for connection/breakage of wires (Part #708)
failure and/or soot on the AFR rod (Part #108)
Abnormal main gas • Check for connection/breakage of wires (Part #707)
solenoid valve 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
Abnormal gas • Check for connection/breakage of wires (Part #707)
and/or burn marks on the computer board (Part #701)
solenoid valve
• Check gas valve contacts and gas valve wire harness
connections for signs of rust or corrosion
Fan 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)
Computer board fault • Check for connection/breakage of wires (Part #711)
Gas solenoid valve • Refer to the 111 and 121 error codes
drive circuit failure
False flame • Check if there is leaking from heat exchanger (Part #401)
detection
Miscommunication • Check the model type of the remote controller
between water • Inspect the connections between the water heater
heater and remote and remote controller
controller • Check the power supply of the water heater
Miscommunication • Inspect the connections between the water heater
between water heater
and temperature controller
and temperature
• Check the power supply of the water heater
controller
(Indoor
model only)
Abnormal exhaust • Check to see of the exhaust temperature is higher
temperature
than 149°F (65°C)
(Indoor
model only)
Imperfect • Check if the gas type of the water heater matches
the gas supplied to it
combustion
• 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
47
Page
Owner's Guide
Troubleshooting
Diagnosis