Takagi T-H3M-DV - Fault Analysis of Error Codes

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)
Troubleshoong
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.