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Carrier rooftop unit

Fan runs but the heat will cycle once and then stop, checked and replaced the ignitor and servised the unit, what's up

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  • paulka Dec 06, 2007

    it was a roof top carrier unit for heating and ac model number as follows 48HJR014-56185 tried a hot suface ignitor but problem still there

  • Anonymous Oct 09, 2008

    need to find a way to support a 10 ton RTU on a steel joist roof. wt = 925#

  • Anonymous Mar 12, 2014

    Wont cycle in auto start stop

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2 Answers

Figured it out, the problem was return air ducting was capped off, by the construction crew, thanks

Posted on Dec 07, 2007

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  • Master
  • 1,420 Answers

A model number may help. Also, are you refering to the inducer fan?

If so, jump out the pressure switch. If it runs, start looking for a blockage in the combustion chamber, blockage in the line to the pressure switch, a bad inducer fan (not getting enough pressure to close switch) or a bad pressure switch.

Posted on Dec 06, 2007

  • Chandler Ede
    Chandler Ede Dec 06, 2007

    OK, check out the things I suggested and get back to me.

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