Carrier Weathermaker 8000 Heat and Cycling Problems

Old 10-31-14, 09:18 PM
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Carrier Weathermaker 8000 Heat and Cycling Problems

Hello all,

First time posting here.
My Weathermaker 8000 lights up fine and all burners are lit, but the heat coming out of the vents is warm at best. Filters are new. Air flow is good. But it just doesn't get hot. Every other house I have lived it it would burn your feet if you stand on the vents. This one will barely get your toes warm.
Also, it will cycle on and run for about 5-10 minutes and then cycle off. After going off, it will come back on 30 seconds later. It will just keep doing this as the house never warms up to the set temp.
Flame sensor is clean, I even tried cleaning it more just in case. That is about the only thing I know to check. Please give me more ideas.
Old 10-31-14, 10:23 PM
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Welcome to the forums.

Most furnaces are not designed to put out heat that will burn your feet.

What cycles on and off........ the entire furnace or just the burner and the blower keeps running ?
I doubt it's a flame sensor issue.

The only real way to measure or diagnose your system is to measure the air temperature entering into the furnace and the heated air temperature leaving the furnace and subtract the two. That will give you a heat rise value which should be posted on a decal inside your furnace.
Old 11-01-14, 12:54 AM
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It looks like Carrier calls many models a Weathermaker 8000.

A blinking LED behind the main door on the newer models or visible on the blower panel on older Weathermaker 8000 furnaces should help in determining the cause of your short cycling furnace.

The model number is located in the burner section of the furnace and may also be on a small sticker the runs along the outside of the furnace door. Posting the model number along with the number of short flashes and long flashes would be of great assistance.

The 58CVA model is also available with the communicating Infinity control. If you have this thermostat the last 10 system events displayed at the stat would offer even more assistance.

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