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UP-GUY 11-26-2012 09:13 PM

G1d801t ultra v shuts down

Furnace is a Ultra V / Advantage 80 made by lennox, 9 years old.
If furnace has to bring the temp up more than 5 degrees it will run for about 15 min and then shut off with the fan still running for a few minutes.
After about 1 hour it will restart and go though the same cycle. If I turn the thermostat off and then back on the furnace will restart. I watch
ed it and this time it gave me a code 4 on a Honeywell "smart valve ll ". The burner went off for about 5 minnuets and then came back on. Fan ran the whole time.
What do you believe is the problem?

hvactech126 11-27-2012 12:00 AM

your filter needs changed or the a/c evaporator coil is plugged up, or you have blocked supplies/returns. IOW, you have an airflow issue.

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