goodman furnace blowing cold air - http://www.hvacmechanic.com/ Forums
Original message
| justdontknow
 |  "goodman furnace blowing cold air"
, posted Wed 8 Oct 21:59  
I have a goodman GMP 100-4 with a rev B control board that has many issues.... It all started with last summer with the tstat set at 50 the furnace started blowing air with the outside temp at 75 deg. House about 80. When trying to restart the furnace this year i received a three blink code and furnace would light the burners for approx 15 secs then when the HSI would shut down the burners would shut off gas and the cycle would repeat. After the 4 lockout cycles would restart and then the furnace would work. Overrode all the safety rollout/limit switches and still would not fire after the lockouts. Now furnace heats but toooooo many just blower cycles with no burners. Just blows air in between cycles for no apparent reason.
Ken
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| | justdontknow
| "Re(2):goodman furnace blowing cold air" , posted Thu 9 Oct 22:24
Unit is 8 yrs old and manually checked pressure switch and found the pressure OK with a meter. The panel states the 3 blink error is the gas valve.
Ken
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