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PDX Series
120 VAC Circuit Trace
Step 1. Verify 120VAC and proper polarity at wall outlet.
Step 2. With unit plugged in and control power switch in the "ON" position verify LED status.
LED status
None, Control LED not
on or flashing.
Disconnect cord set as
shown in photo 26
Using a volt meter set to
volts AC, is there 120VAC
across terminals shown
in photo 27 ?
Y
Is there 120VAC across
terminals shown in
photo 28 ?
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 30)
Is there 120VAC across
black & white wires as
shown in photo 30?
N
Call for technical
support.
30
LED status
Short flash, once every
four seconds.
Waiting for
call for heat.
N
Y
Reconnect cord set
shown in photo 26.
Disconnect wire harness
from gas control
(see photo 29).
Y
Replace gas
control.
PDX SERVICE PROCEDURE IX
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
LED status
"Heartbeat", alternates
bright/dim.
Thermostat calling
for heat
26
Check for damage to AC
supply power cord.
N
Replace Blower
30
Wire sheath pulled back to
Check for 120VAC between black & white wires.
-NOTE-
Electronic meter probes required. Use care not to
damage connector during this check.
120 VAC Trace
WARNING
LED status
Various flashing error
codes.
Verify error code as
listed on page 12
27
Y
Repair damage
Wire harness
identify wire colors
28
29
Page 30
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