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Wire Color
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
S (
V
) 1
B
a l
k c
-
R
e
d
S (
V
) 2
B
a l
k c
-
O
a r
n
g
e
S (
V
) 3
B
a l
k c
-
Y
e
o l l
w
(POV) Orange - Orange
(M) Water Flow Servo
Red - Blue
Gray - Brown
Gray - Yellow
NOTE: At the F connector on the PCB: gray wire turns to black
(QS) Water Flow Sensor
Black - Red
Yellow - Black
Bypass Flow Control
Brown - White
O
a r
n
g
e
-
W
h
e t i
Y
e
o l l
w
-
W
h
e t i
R
e
d
-
W
i h
e t
G /
o r
u
n
d
(IG) Ignition System
Gray - Gray
(FM) Combustion Fan Motor
Red - Black
White - Black
Yellow - Black
With the meter set on hertz scale, 60-420 hertz should be across the red and yellow wires at
terminals 2 and 4.
On-Demand Gas Tankless Water Heater Service Manual
Electrical Diagnostic Points
705e/o (ASME),
705i (ASME)
Voltage
11 - 13 VDC
2 - 15 VDC
11 - 13 VDC
4 - 6 VDC
N/A
11 - 13 VDC
4 - 7 VDC
1 - 1.4 mega ohms
2 - 6 VDC
(unit in operating
mode)
90 - 110 VAC
6 - 45 VDC
5 - 10 VDC
11 ~ 13 VDC
Resistance
Connector No. Pin No.'s
24 - 28 ohms
37 - 43 ohms
37 - 43 ohms
37 - 43 ohms
67 - 81 ohms
22 - 28 ohms
N/A
N/A
5.5 - 6.2 K ohms
15 - 35 K ohms
N/A
N/A
9.2 - 9.4 K ohms
3.5 - 3.9 K ohms
15
H3
6 ~ 7
H
4
5
~
6
H
5
4
~
6
H
6
3
~
6
H2
9 ~ 10
F5
9 ~ 10
F5
5 ~ 7
F5
5 ~ 8
F2
1 ~ 3
F2
2 ~ 3
1 ~ 5
2
~
5
G1
3
~
5
4
~
5
C1
1 ~ 2
E1
1 ~ 2
E1
2 ~ 4
E1
2 ~ 3
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