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Unit blower comes on but no heat the light on control board flashes 4 times pause then 4 times again when system is calling for gas these flashes indicate that a [thermal device is open]can anyone...

When I turn thermostat on for heat,the gas will not ignite--I get 4 red flashes on my control board indicating (Thermal Detection Device Open).Does anyone know where the reset switches are?If I could...

That is a safety device to cool down the chamber as long as it cuts off within 3-5 minutes.

My gas central unit will not ignite when turned on

Unit? My central\ cooling\heat pump does not come on when I turn on cool

First cut power to unit then unplug&draw a wire diagram from motor to transfer box& then move box out of way&then remove two screws on front side of squirrel cage box.The case will slide out with...