115 Vac Circuit Trace - Bradford White UPV Series Service Manual

UPV Service Procedure X – 115 VAC Circuit Trace

115 VAC Circuit Trace

Step 1. Verify 115 VAC and proper
polarity at wall outlet.
Step 2. With the unit plugged in and control power switch in the "ON" position, verify LED status.
LED status
none, Control LED
not on or flashing.
Disconnect cored
set as shown in
photo 22.
Using a voltmeter set to
volts AC, is there 115
VAC across terminals
shown in photo 23.
Y
Is there 115VAC
Y
across terminals
shown in photo 24.
N
Incorrect supply
voltage polarity.
Locate black & white
wires at connector, it
may be necessary to
pull back wire sheath
to identify wire colors
(see photo 26).
Is there 115 VAC across
black & white wires as
shown in photo 26.
N
Call Technical Support.
30
LED status
none, Control LED
not on or flashing.
Waiting for
call for heat.
N
Check for damage to
AC supply power cord.
Reconnect
cord set shown
in photo 22.
Disconnect wire
harness from gas
control (see photo 25).
Y
Replace gas control.
115 volt potential exposure.
Use caution to avoid personal injury.
LED status
none, Control LED
not on or flashing.
Thermostat
calling for heat.
22
Repair damage.
Replace blower.
30
WARNING
LED status
none, Control LED
not on or flashing.
Verify status code as
listed on page 11.
23
25
26
24