Rheem 10143267, Service Instructions Manual, Page: 27 / 60

TM090 12-26 Series II CFGWH Service Instructions
REV AB
– Issued February 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies
are deemed “uncontrolled”
27
DIAGNOSTIC TEST POINTS
Refer to wiring diagram, page 8, for connector and wiring positions.
Test
Point
Measuring Point
Normal Condition Items Under Test
Connector
Wire Nº
& colour
1 A BL2
– BR1
AC 207V
– 264V
Main Power
2 I W2
– W3
40 kilo-ohms
– 500 kilo-ohms
Overheat Limiter
3 F
BL17
– BK16
DC 2V
– 5V(Pulse)
*1
More than 1310 pulse/min
Water Flow Sensor pulse signal
R18
– BK16
DC 7V
– 15V
Water Flow Sensor voltage
4 L
BK3
– R1
DC 5V
– 50V
Fan Motor
O4
– BK3
DC 9V
– 15V
Y5
– BK3
DC 4V
– 10V(Pulse)
*1
More than 4800 pulse/min
Fan Motor pulse signal
5 F W10
– BK9
@ 20ºC
– 10.3 kilo-ohms
@ 40ºC
– 4.9 kilo-ohms
Water Inlet Thermistor
6 F G14
– BK9
@ 20ºC
– 10.3 kilo-ohms
@ 40ºC
– 4.9 kilo-ohms
Heat Exchanger Thermistor
7 F BL15
– BK9
@ 20ºC
– 10.3 kilo-ohms
@ 40ºC
– 4.9 kilo-ohms
Hot Water Outlet Thermistor
8 F BL11
– BK9
@ 5ºC
– 12.5 kilo-ohms
@ 20ºC
– 6.3 kilo-ohms
Ambient Air Thermistor
9
J R1
– Earth
AC 1V
– 170V
*2
Flame Sensor detecting flame
K GY1
– Earth
AC 1V
– 170V
*2
10 I R6 - BK5
DC 1.5V
– 14V
40 ohms
– 80 ohms
Proportional Gas Flow Regulating
11 I Y12
– BK11
DC 9V
– 15V
17 ohms
– 27 ohms
Gas Inlet Solenoid Valve
12 I O9
– BK11
DC 9V
– 15V
Igniter
13 I R8
– BK11
DC 9V
– 15V
14 ohms
– 23 ohms
Solenoid Valve 2
14 K GY1 - Earth AC 1V
– 170V
*2 Flame Sensor detecting flame
15 F
W2
– BK1
DC 8V
– 16V
Water Volume Control Motor position
switch
R7
– BK1
DC 8V
– 16V
G3
– BK1
Less than DC 1V (Limiter ON)
DC 4V
– 6V (Limiter OFF)
16
I
Y12
– BK11
DC 9V
– 15V
17 ohms
– 27 ohms
Gas Inlet Solenoid Valve
BL10
– BK11
DC 9V
– 15V
14 ohms
– 23 ohms
Solenoid Valve 1
R8
– BK11
DC 9V
– 15V
14 ohms
– 23 ohms
Solenoid Valve 2
W7
– BK11
DC 9V
– 15V
14 ohms
– 23 ohms
Solenoid Valve 3
R6
– BK5
DC 1.5V
– 14.0V
40 ohms
– 80 ohms
Proportional Gas Flow Regulating
J R1 - Earth
AC1V
– 170V
*2
Flame Sensor detecting flame
K GY1 - Earth AC1V
– 170V
*2
NOTES:
*1:
Approximate reading measured by digital multimeter on DC range.
*2: Approximate reading measured by digital multimeter on AC range.