Carrier mxa100 cycles once flawlessly then locks out code 21

johnnyhvac1122 Posts: 1, Reputation: 1

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Nov 10, 2010, 06:05 PM

Carrier mxa100 cycles once flawlessly then locks out code 21

I have a carrier mxa100 90 percent it flashes cose 21 miswired gas valvle or faulty control I replaced control and I still have same problem. I reset switch it cycles perfect then after it reaches temp it locks out with code 21 then I reset and restart it and it locks out again codeb 21

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