Takagi T-H3M-DV - Page 47

47 Page
Remote
Green
LED
Malfunction
description
Diagnosis
391
Two Times Air-fuel ratio rod
failure
• Check for connection/breakage of wires (Part #708)
and/or soot on the AFR rod (Part #108).
510
Six Times Abnormal 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.
551
Six Times Abnormal 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..
611
Four Times 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).
701
One Time Computer board fault • Check for connection/breakage of wires (Part #711).
711
One Time Gas solenoid valve
drive circuit failure
• Refer to the 111 and 121 error codes.
721
Six Times False flame
detection
• Check if there is leaking from heat exchanger (Part #401).
741
N/A Miscommunication
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.
751
N/A Miscommunication
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.
941
Five Times Abnormal exhaust
temperature (Indoor
model only)
• Check to see of the exhaust temperature is higher
than 149°F (65°C).
991
Five Times Imperfect
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.
Troubleshoong
Owner's Guide