Heating, Ventilation, and Air Conditioning (HVAC)

searor · #1 (**permalink**) 12-17-2010, 11:51 AM

My roof top unit will run for about 15 minutes and shut off. normal right. then it never comes back on. could it be the fan and limit control switch? or should i check something else? please help.

icehouse · #2 (**permalink**) 12-18-2010, 09:17 AM

Quote:

Originally Posted by searor

My roof top unit will run for about 15 minutes and shut off. normal right. then it never comes back on. could it be the fan and limit control switch? or should i check something else? please help.

If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

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Amana roof top unit

Heating, Ventilation, and Air Conditioning (HVAC)

My roof top unit will run for about 15 minutes and shut off. normal right. then it never comes back