ruud silhouette ii not igniting


Old 02-15-14, 09:26 PM
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ruud silhouette ii not igniting

RUUD Silhouette ii
Model # UGPH-10EAMER
SER # DH5D302F169601415

Thermostat calls for heat.
The inducer and other fans start
The surface igniter does not glow (just replaced)
No other sounds or clicks
No evidence of gas
fans shut off
It will continue to run through this process every few minutes without igniting.
What should I check first?
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Old 02-15-14, 10:03 PM
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Welcome to the forums.

I'm guessing your furnace doesn't have a control board with a blinking LED on it. If it did.... it would be blinking a trouble code that would help you diagnose your problem.

There is a pressure switch attached to the draft inducer blower. You need to remove the two wires on it and connect an ohmmeter. You need to watch the meter and see if it shows continuity after the draft inducer starts up.

If it does..... you need to reconnect the wires and check for voltage on the igniter wires. You should see somewhere between 80-120vac.

If it doesn't show continuity, remove the rubber hoses and check for plugged ports at the end... especially the blower end.

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