Keeprite Oil Fired Warm Air
Model FLO 115
Serial 1367
Age approx 25 years



Problem - Started to occur over last 6 months, good for many years

1. Under certain low barometric days no wind, exhaust fumes coming back through burner air in take 88 ppm carbon monoxide.
2. Furnace will run fine for a week then problem occurs
3. Furnace does short cycles on / off during problem times

To Date
Inspected flame - good
Have changed nozzle and filter
Adjusted air in take
Checked flew draft on low or no wind days - good

It was suggested That

1. Heat Exchanger may be partially plugged reducing the amount of required air required by the heat exchanger and causing a heat build up in the chamber and short cycling of furnace

Is there a schematic for this furnace I could view?
Have there been any recalls on this furnace?
All help comments appreciated

Sounds like you have a cracked heat chamber. WHat is the carbon level coming out of the supply registars?