Takagi T-K3 Service Manual page 35

Error Code
Disconnected/damaged hi-limit switch. (Refer to section 10-12)
6
111
Visual inspection: connection/breakage of wires.
Normal:1 Ω or less between blue & blue
7 Inspect flame rod
Error code is
Check for any soot on the rod.
①
shown after
Check the connection of ground wire; make sure there is firm
②
three failed
contact to the ground of the T-K3
attempts at
(in this case, the wire is contacted to the manifold surface.)
ignition
PCB fault
③
During operation: more than 1μA through the flame rod wire
(orange)
Flame rod fault (insulated resistance)
④
Normal: 40KHz ～ 60KHz (between orange & green)
8 Check if hi-limit switch is properly functioning.
Error Code
Flame blows out
121
1 Check gas supply and pressure
2 PCB fault
Error code is
No voltage to gas main solenoid valve (MV)
shown after
①
three failed Normal: DC78 ～ 100V between COM (blue) & #3 (light blue)
attempts at
No voltage to gas solenoid valve (SV
②
ignition
Normal: DC78 ～ 100V between COM (blue) & #9 (green)
No voltage to gas proportional valve (VG
③
Normal: DC1 ～ 15V between white & red
3 Gas solenoid fault
Main gas solenoid valve (MV) fault
①
Normal: 0.9 ～ 1.3k Ω between COM (blue) & #3 (light blue)
Gas solenoid valve (SV
②
Normal: 0.9 ～ 1.9k Ω between COM (blue) & #9 (green)
③ Gas proportional valve (VG
Normal: DC1 ～ 15V between white & red
4 Check for soot on the flame rod
① Clean the flame rod
② PCB fault
During operation: more than 1μA through the flame rod wire
(orange)
③ Flame rod fault (insulated resistance)
Normal: 40KHz ～ 60KHz (orange & green)
Diagnosis
Malfunction description
Diagnosis
) fault
1
35
Cancellation method
Turn off the power or water
supply
(Refer to section 1)
)
1
)
0
) fault
0
CONFIDENTIAL
T-K3 Servi c e Manual
Ver. 1.05
Checkpoint
C1
I
Checkpoint
C
H1
C
H1
I