Bradford White EF60T125 Service Manual page 18

Water Heater Fault: Water heater does not operate
Display Error Code: Water heater display does not operate - blank display
Check main power supply to water
heater - fuse, circuit breaker, plug
receptacle, line cord or wiring to water
heater.
Check to make sure switch on front of
control panel is in the ON position
Verify Primary voltage at the
control board.
Verify Secondary voltage at the control
board.
Does water heater display operate?
Does the combustion blower start to
operate? Increase thermostat setting if
tank is warm.
Y
Display Operates - See next
page
18
making voltage checks to avoid personal injury.
making voltage measurements or jumping terminals
Refer to Control Board illustration.
Voltage at primary pins P2(1) & P2(3)
will be 110-120. If not, check Line In
pins P3(1) & P3(4). Check line cord with
volt meter. Replace line cord if
defective.
Refer to Control Board illustration. Voltage at
secondary pins P4(1) & P4(2) will be 24VAC.
If not, check transformer. Replace
transformer or wire harness.
CONTROL BOARD
3
2
1
J1
Is 24VAC present between
N
RED and BLACK wire pin
connections on the back of
Control Display?
N
Is 24VAC present between E-COM
screw terminals P9(2) & P9(3) on
the Control Board.
N
Replace
Control Board
System Observation
For models with Direct Spark Ignition
WARNING
120 volt potential exposure. Use caution
CAUTION
Use caution not to damage connectors when
Transformer
Top terminals are 24VAC;
Bottom terminals are 120VAC
1 2
6 3
8 5
1 2 3
4 1
P5 P4 P9 P10
Check wires for proper termination
Y
to control display.
Are wire terminations connected
properly to control display?
Check wire
Y
harness for
proper continuity
1
1
3
5
1
3
4
P2 P3 P7
Y
Replace Control
Display.
N
Make proper wire
terminations
18