our furnace fan runs all the time
It doesn't switch off when the furnace does and keeps blowing cool air
I've replaced the filter and it's still running
The thermostat (RTH6400D) isn't set up to run the fan. It has only two wires connected, W and R
The furnace is a Beckett(by Honeywell) R7184B
Thank you
Buck
Best Answer
If this problem just started (the furance hasn't always operated like this), then it's likely an open high limit switch.
If it's a manually resettable limit, you can try resetting it yourself. If it's an automatic reset device, you'll probably have to replace it.