PDX Series
PDX SERVICE PROCEDURE IX
120 VAC Trace
120 VAC Circuit Trace
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
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 | LED status | |||
None, Control LED not | Short flash, once every | |||
on or flashing. | four seconds. | |||
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| Waiting for | ||
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| call for heat. | ||
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| 29 | ||
Disconnect cord set as | ||||
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shown in photo 29 |
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Using a volt meter set |
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to volts AC, is there | N |
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120VAC across |
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terminals shown in |
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photo 30 ? |
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| Y |
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Is there 120VAC | Y | Reconnect cord set | |||
across terminals | |||||
| shown in photo 29. | ||||
shown in photo 31 ? |
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| N |
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| Disconnect wire harness | ||||
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Incorrect supply |
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| from gas control | ||||
voltage polarity |
| (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)
Is there 120VAC |
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across black & white Y | Replace gas | ||
wires as shown in |
| control. | |
photo 33? |
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| N |
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Call for technical |
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support. |
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LED status | LED status | ||
“Heartbeat”, alternates | Various flashing error | ||
bright/dim. | codes. | ||
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Thermostat calling | Verify error code as | ||
for heat | listed on page 12 | ||
30 | 31 | ||
Check for damage to Y | Repair damage | |||
AC supply power cord. |
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| N |
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Replace Blower |
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32
Wire harness
33
Wire sheath pulled back to
identify wire colors
Check for 120VAC between black & white wires.
Electronic meter probes required. Use care not to
damage connector during this check.
Page 31
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