Quick Reference Diagnostic Points - Bradford White IGI-180R-10 Service Manual

VI - TROUBLESHOOTING

Quick Reference Diagnostic Points

IMPORTANT SAFETY NOTES:
There are a number of (live) tests that are required when fault finding this product. Extreme care
should be used at all times to avoid contact with energized components inside the water heater.
Only trained and qualified service agencies should attempt to repair this product.
Remember, before checking for resistance readings, you should disconnect the power source
(unplug it) to the unit and isolate the item to be checked from the circuit.
(TR) Transformer:
Wire color
Black ~ White
Blue ~ Brown
(SV0, SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)
(SV0) Pink ~ Black
(SV1) Black ~ Yellow
(SV2) Black ~ Blue
(SV3) Black ~ Brown
(POV) Pink ~ Pink
(M) Water Flow Control Device Servo or Geared Motor:
Red ~ Blue
Grey ~ Brown
Grey ~ Yellow
Grey ~ Orange
NOTE: The grey wire listed above turns to black at B connector on the PCB, the orange wire turns to red.
(QS) Water Flow Sensor:
Black ~ Red
Yellow ~ Black
By-pass Flow Control:
Brown ~ White
Orange ~ White
Yellow ~ White
Red ~ White Gnd
(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 red and yellow wires at terminals 2 and 3 you should
read between 60 and 350 Hertz.
(cont.)
Voltage
100 ~ 120 VAC 51 ~ 63 ohms
110 ~ 120 VAC 51 ~ 63 ohms
80 ~ 100 VDC 1,8K ~ 2K ohms
80 ~ 100 VDC 1,8K ~ 2K ohms
80 ~ 100 VDC 1,8K ~ 2K ohms
80 ~ 100 VDC 1,8K ~ 2K ohms
2 ~ 15 VDC 67 ~ 81 ohms
11 ~ 13 VDC 22 ~ 26 ohms
4 ~ 6 VDC
N/A
11 ~ 14 VDC
11 ~ 13 VDC
4 ~ 7 VDC 1 meg ~ 1.4 meg
2 ~ 6 VDC Unit in operating
90 ~ 100 VAC
6 ~ 45 VDC
6 ~ 45 VDC
11 ~ 13 VDC 3
27
Resistance Connector #
N/A
N/A
N/A
5.5K ~ 6.2K
G4 ~ G5
mode G2 ~ G5
15 ~ 35K G1 ~ G5
G3 ~ G5
N/A
N/A
9.2K ~ 9.4K
.5K ~ 3.9K
Pin #'s
F9 1 ~ 2
F7 1 ~ 3
E1 1 ~ 2
E2 2 ~ 3
E3 2 ~ 4
E4 2 ~ 5
C2 3 ~ 4
B2 9 ~ 10
B2 5 ~ 7
B2 5 ~ 8
B2 5 ~ 6
B4 5 ~ 6
B4 1 ~ 5
4 ~ 5
2 ~ 5
1 ~ 5
3 ~ 5
F8 2 ~ 3
A1 1 ~ 2
A1 2 ~ 4
A1 2 ~ 3