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Old 10-22-2012, 02:45 PM   #1
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Lennox RTU won't light

I have a Lennox RTU, model number GCS16-036-90-2P, it has replaced the control unit (Johnson Controls) couple of years ago, and replaced the blower last year, but again, this year, it didn't light up.
After turn it on, adjust the temperature, I can hear the clicking, then the blower start to run, I didn't see the furnace light up.
I guess it may be the problem from either the ignitor or the ignitor control, if you have any experience of how to identify the problem, would you please share it here.

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Old 10-22-2012, 04:57 PM   #2
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Lennox RTU won't light

crack the gas union going to the unit verify the gas...

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Old 10-22-2012, 08:24 PM   #3
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Lennox RTU won't light

Is there a flashing led diagnostic light on an electronic board that is visable through a viewing port in the door?
There should be a legend in the furnace that will explain those flashes.
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Old 10-22-2012, 08:31 PM   #4
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Lennox RTU won't light

As biggles stated make sure you have gas. Sounds like the spark ignition is working so you're dealing with dirty burners and orifices,ignition module not powering gas valve or a faulty gas valve. Checking to see if there's 24v at the gas valve or not will confirm or eliminate the module as the issue.
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lennox rtu won't light up

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