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Arcoair central heat /air conditioning unit

I turn the thermostat on and the heat kicks on for about 3 minutes then the air turns cold and the fan stays on constantly.termostat is set on auto,heat.Why wont it shut off when the heat shuts off. [arcoaire]

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  • scott_hadsel Jan 18, 2009

    THANKS.Your solution helped . I like this website. I will be visiting periodically especially if I have anymore problems with anything

  • Anonymous Mar 22, 2014

    colmen modole 933oe715, heating problem and this unit is brand new..........

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  • 334 Answers

The blower motor kicks on when there has been a 24 volt control failure.

This usually means that a limit switch has tripped.

Most likely that would be a high temp limit switch or a rollout switch.

First, make sure the filters are clean. and the evap coil is clean. If eaither are dirty/clogged, it will partially block airflow, causing the furnace to overheat, causing the high temp limit to trip.

A rollout switch typically trips for three reasons.
1 flame rollout into the burner compartment due to poor airflow.
2 overheating af teh metal plate the rollout is mounted to, due to dirty, old, rusted components.
3 a bad limit switch.

If your unit has an LED light, count the flashes and it will hepl popint out the problem.
(locate the wiring diagram/flash code list, and correspond the flash count, with the code.)

First, check filters.

Posted on Jan 14, 2009

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