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UPV75 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.
WARNING
115 volt potential exposure.
Use caution to avoid personal injury.
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.
Is there 115VAC
across terminals
shown in photo 24.
Incorrect supply
voltage polarity.
Reconnect
cord set shown
in photo 22.
Disconnect wire
harness from gas
control (see photo 25).
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.
Replace gas control.
Call Technical Support.
LED status
none, Control LED
not on or flashing.
LED status
none, Control LED
not on or flashing.
LED status
none, Control LED
not on or flashing.
Waiting for
call for heat.
Thermostat
calling for heat.
Verify status code as
listed on page 12.
22
23
24
25
26
Y
Y
Y
Check for damage to
AC supply power cord.
Repair damage.
Replace blower.
N
N
N
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