Rinnai REU-KA2530FFUD-US Service Manual page 15

(QS) Water Flow Sensor:
Wire Color
Black - Red
Yellow - Black
By-Pass Flow Control:
Red - Pink
Yellow - Black
(IG) Ignition System:
Grey - Grey
(FM) Combustion Fan Motor:
Red - Black
White - Black
Yellow - Black
Set your meter to the hertz scale. Reading across the white and black wires at terminals 3 and 5 you
should read between 60 and 420 hertz.
Thermal Fuse / Overheat Switch:
Red - White
Outgoing Water Thermistor:
White - White
Blue - Blue
Heat Exchanger Temperature Thermistor:
Pink - Pink
Inlet Thermistor:
White - White
Remote Control:
Terminals J
KB Series Electrical Diagnostic Points
Voltage Resistance
11 ~ 13 VDC 5.5 ~ 6.2 K ohms
4 ~ 7 VDC 1 ~ 1.4 Mega ohms
2 ~ 6 VDC 44 ~ 52 ohms
2 ~ 6 VDC 44 ~ 52 ohms
90 ~ 110 VAC N/A
6 ~ 45 VDC N/A
5 ~ 10 VDC 9.72 ~ 9.75 K ohms
11 ~ 13 VDC 4.02 ~ 4.05 K ohms
11 ~ 13 VDC Below 1 Ohms
*See example on
N/A
page 11
*See example on
N/A
page 11
*See example on
N/A
page 11
*See example on
N/A
page 11
10 ~ 13 VDC 1.5 ~ 3.0 K ohms
Connector # Pin #'s
L3 E10 - G7
B3 4 - 6
G1 12 - 13
G1 10 - 11
C1 1 - 3
L2 5 - 6
L2 3 - 5
L2 4 - 5
B8
B1 - G8
B7
E6 2 - 3
E6 4 - 5
E5 4 - 7
E9 4 - 9
J 1 - 2
RU80i/e, RU98i/e