T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
19
CONFIDENTIAL
10-3. Fan motor
Unit Part #
#103
Takagi Part #
EKK25 (T-D2-IN)
EKK54 (T-D2-OS)
Checkpoint
G
Function
To provide combustion air into the combustion chamber and to exhaust flue
gas.
Failure events
1. Fan speed failure, causing abnormal sounds with or without combustion
during operation.
2. Unexpected activation caused by the connectors of the fan motor getting
wet.
3. Disconnects from the bottom of the combustion chamber.
Effects on the water
heater if fan motor fails
1. The water heater does not function properly.
2. Failure to ignite or abnormal ignition.
3. Unstable combustion conditions.
Error codes when the fan
motor fails
101 111 121 611 991
Diagnostic
1. Visual inspection: connection/breakage of wires or dust (causing electrical
shortage)
2. Voltage check: proper range of voltages shown below.
Color/Number of wires
Red-Blue
110 to 160 VDC (Input)
Yellow-Blue
13 to 17 VDC (Input)
Orange-Blue
2.0 to 6.5 VDC (Input)
White-Blue
Verify the fan motor speed using the Diagnostics Mode of
the TM-RE30 temperature remote controller. See Section
12-1 for details.
5
-
3
/
8
"
(
1
3
7
.4
m
m
)
O
p
e
n
i
n
g
2
-
1
/
4
"
(
6
0
m
m
)
T-D2-OS
PWN multi blade fan motor
PWN turbo fan motor
T-D2-IN
6
-
1
/
2
"
(
1
6
5
.5
m
m
)
3 - 3 / 4 "( 9 5 .1 5 m m )
O p e n i n g 2 - 1 / 8 " ( 54 m m )
Fan damper (#115 / TU001)
1 -5/
8 " (
40m
m )
4 0
The fan damper
is not included in
EKK25.
