Takagi T-H3M-IN/OS - Manual (Page 46)

46
Page
Remote
Green
LED
Malfunction
description
Diagnosis
031 One Time Incorrect DIPswitch
setting
• Check the DIPswitch settings on the PCB (Part #701)
101 Five Times Warning 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
111 Three Times Ignition 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
121 Three Times Loss 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
311 Two Times Outlet thermistor
failure
• Check for connection/breakage of wires and/or
debris on thermistor (Part #407, 408, 715)
• Check the resistance
321 Two Times Inlet thermistor
failure
341 Two Times Exhaust thermistor
failure (Indoor
models 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