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PDX SERVICE PROCEDURE IX
120 VAC Trace
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Disconnect cord set as
shown in photo 29
L
ED status
N
one, Control LED not
on or flashing.
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.
L
ED status
S
hort flash, once every
four seconds.
L
ED status
“
Heartbeat”, alternates
bright/dim.
L
ED status
V
arious flashing error
codes.
Waiting for
call for heat.
Thermostat calling
for heat
Verify error code as
listed on page 12
Using a volt meter set
to volts AC, is there
120VAC across
terminals shown in
photo 30 ?
N
Y
29
3
0
Reconnect cord set
shown in photo 29.
Repair damage
Check for damage to
AC supply power cord.
Y
N
Replace Blower
33
Check for 120VAC between black & white wires.
-NOTE-
Electronic meter probes required. Use care not to
damage connector during this check.
Wire sheath pulled back to
identify wire colors
32
Wire harness
Disconnect wire harness
from gas control
(see photo 32).
Locate black & white wires at
connector, It may be necessary to pull
back wire sheath to identify wire colors.
(see photo 33)
Y
N
Replace gas
control.
Is there 120VAC
across black & white
wires as shown in
photo 33?
Call for technical
support.
Is there 120VAC
across terminals
shown in photo 31 ?
N
Y
Incorrect supply
voltage polarity
3
1
Page 31
120 VAC Circuit Trace
PDX Series
31