Bradford White EVERHOT TG-150E-N(X Installation And Operation Instruction Manual page 37

Troubleshooting – Electrical
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 technicians should attempt to repair this product. Before checking for resistance
readings, disconnect the power source to the unit and isolate the item from the circuit (unplug it).
Table 11. (SV1, SV2, SV3, and POV) Gas Valve and Modulating Solenoids (Set Meter Above 2k).
Wire Color
(Main) Pink-Black
(SV1) Black-Yellow
(SV2) Black-Blue
(SV3) Black-Brown
(POV) Pink-Pink
Wire Color
Red-Blue
Grey-Brown
Grey-Yellow
Note: The grey wire listed above turns to black at F connector on the PCB.
Wire Color
Black-Red
Yellow-Black
Wire Color
Brown-White
Orange-White
Yellow-White
Red-White -
Ground
Wire Color
Grey-Grey
Wire Color
Red-Black
White-Black
Yellow-Black
Set your meter to the hertz scale. Reading across the white and black wires at terminals 2 and 4 you should read
between 60 and 420 hertz.
Voltage
11-13 VDC
11-13 VDC
11-13 VDC
11-13 VDC
2-15 VDC
Table 12. (M) Water Flow Control Device Servo or Geared Motor.
Voltage
11-13 VDC
4-6 VDC
n/a
Table 13. (QS) Water Flow Sensor.
Voltage
11-13 VDC
4-7 VDC
Table 14. By-pass Flow Control (By-pass Servo Model Only).
Voltage
2-6 VDC (unit
in operating
mode)
Table 15. (IG) Ignition System.
Voltage
90-110 VAC
Table 16. (FM) Combustion Fan Motor.
Voltage
6-45 VDC
5-10 VDC
11-13 VDC
Connector
Resistance
36.8-44.8 ohms
36.8-44.8 ohms
36.8-44.8 ohms
36.8-44.8 ohms
67-81 ohms
Connector
Resistance
22-28 ohms
n/a
n/a
Connector
Resistance
5.5-6.2k ohms
1-1.4 Mega ohms
Connector
Resistance
15-35 ohms
Connector
Resistance
n/a
Connector
Resistance
n/a
9.2-9.4k ohms
3.5-3.9k ohms
37
Pin
No. Nos.
H5 6-7
H6 5-6
H7 4-6
H8 3-6
H3 9-10
Pin
No. Nos.
F7 9-10
F7 5-7
F7 5-8
Pin
No. Nos.
F2 1-3
F2 2-3
Pin
No. Nos.
G1 1-5
G1 2-5
G1 3-5
G1 4-5
Pin
No. Nos.
C1 1-2
Pin
No. Nos.
E1 1-2
E1 2-4
E1 2-3