Takagi T-K3 - Page 37

T-K3 Service Manual
Ver. 1.05
37
CONFI DENTIAL
Checkpoint
1 Flow sensor fault
(Refer to section 10-9)
Checkpoint
1
Visual inspection of gas valves: connection/breakage of wires.
Normal: DC78
～
100V between COM
(
blue
)
& #3
(
li
g
ht blue
)
Normal: DC78
～
100V between COM
(
blue
)
& #9
(g
ree n
)
Normal: DC78
～
100V between COM
(
blue
)
& #53
(
oran
g
e
)
Normal: DC78
～
100V between COM
(
blue
)
& #73
(
red
)
2 Gas solenoid valve fault
(
MV, SV
1
, SV
2
, and/or SV
3
)
Checkpoint
1 PCB and fan motor fault
(
Refer to section 10-3 & 10-15
)
Normal: DC 110
～
160V between red & blue
Normal: DC 13
～
17V between
y
ellow & blue
Normal: DC 2.0
～
6.5V between oran
g
e & blue
441
510
Error Code Malfunction description Cancellation method
Flow sensor failure
Turn off the power or water
supply
Dia
g
nosis
H2
Visual inspection: connection/breakage of wires and/or debris
on impeller.
Check voltage/resistance between (red & black) or (white &
black)
Error Code Malfunction descri
p
tion Cancellation method
Error Code Malfunction description Cancellation method
Fault of driving circuit for any of the gas
solenoid valves (MV, SV
1
, SV
2
, and/or SV
3
)
Turn off the power supply
(The computer checks the condition of the
main gas valve immediately after every
operation and the conditions of the solenoid
valves 6 hours after every operation)
Diagnosis
PCB and/or
g
as valve fault
(
Refer to section 10-4 & 10-15
)
C
Visual inspection of PCB: connection/breakage of wires and/or
burn marks on the computer board.
G
Visual inspection of PCB: connection/breakage of wires and/or
burn marks on the computer board.
Verify fan motor speed of the T-K3 using the "diagnostics
mode" of the TM-RE10 temperature remote controller.
See the "12-1. How to diagnose the T-K3 using the TM-RE10"
Visual inspection of fan motor: connection/breakage of wires or
dust buildup (causing electrical shortage)
611
Fan motor fault
Turn off the power or water
supply
Diagnosis