Lennox G71-MPP-60D-135 Error Code 312


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Old 08-13-10, 08:36 PM
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Lennox G71-MPP-60D-135 Error Code 312

I have a Lennox G71-MPP furnace and XC13-060 (5 ton) Central Air. Today I noticed that when the blower was running at high speed, the LED was flashing E312. The LED returned to display RPM after the blower changed over to a lower speed.

Any body know what E312 means? It seems like an error code to me...
 
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Old 08-15-10, 10:12 AM
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This is what I found in Lennox Service Document:

312 Restricted airflow cooling or continuous fan mode − information only

I am wondering if this is a filter change issue or duct sizing issue.
 
 

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