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Disconnecting the white wire had no effect. This morning the blower is running and does not shut off. Circuit board light is flashing five times. Ended up being a component on the circuit board is starting to fail. Replace the board and all is well. Thans to everyone for your help.

Yes the fan runs at full speed. It is not a two speed fan. The air conditioner has been switched on now due to the warm days we are having and the air conditioning system works as it should. Periodically though the vent fan and the blower turn on for no reason. No demand for air was...

If the limit switch was bad wouldn,t the circuit board light flash to indicate a bad limit?

The furnace is a Janitrol gas fired furnace with a glow plug,. No pilot light.

It is summertime so there is no demand for heat. The temperature is cool s0 there is no demand for cooling. The blower on my furnace is cycling on and off. I turned off the thermostat and this had no effect. Still cycles. I disconnected the green wire from the thermostat to the...