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Old 10-08-2009, 11:13 AM   #1
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Carrier WeatherMaker 9200


Model 58mxa. The furnace will only start when power is turned off/on.

It runs for a short period and shuts down (approx. 3 min.).

Exhaust motor runs fine. Flame is blue while running.

Any help?

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Old 10-08-2009, 02:19 PM   #2
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Carrier WeatherMaker 9200


Check failure code(s), red LED will flash short and long flashes, short is the first #, and long is the second #, inside of front door is the status codes for the MXA , good luck

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Old 10-08-2009, 02:52 PM   #3
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Carrier WeatherMaker 9200


Thanks backspace, I did that and all I get is continued blinking. There is no spacing in the the red light flashing.

I am electrician by trade and my gut tells me it is something simple. Because the furnace does work. Something is telling it to shut down.

My gut has been wrong before however.
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Old 10-08-2009, 03:38 PM   #4
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Carrier WeatherMaker 9200


a rapid blinking LED is an indication of reversed polarity (115Vac), try another sequence and watch for a code
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Old 10-08-2009, 07:32 PM   #5
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Carrier WeatherMaker 9200


Is there continuos 24 volts between W and C on the circuit board when the heat is on? Your tstat may be dying and short cycling. Jumper R and W at the tstat with wires off and see if it runs longer than 3 minutes.
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Old 10-08-2009, 09:53 PM   #6
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Carrier WeatherMaker 9200


Check for plugged condensate drain.
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Old 10-12-2009, 04:32 PM   #7
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Quote:
Originally Posted by backspace View Post
a rapid blinking LED is an indication of reversed polarity (115Vac), try another sequence and watch for a code

The instructions say point c on the control board to test point. Don't see how polatity 115Vac fits in, the board is 24 volts. I'll check.
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Old 10-12-2009, 04:38 PM   #8
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Quote:
Originally Posted by yuri View Post
Is there continuos 24 volts between W and C on the circuit board when the heat is on? Your tstat may be dying and short cycling. Jumper R and W at the tstat with wires off and see if it runs longer than 3 minutes.

One of the first things I did. I did not mention is the old t-stat required c at the t-stat as it had no battery, and was electronic. The new t-stat has a battery(s). I jumpered R and W on the furnace, same result. 3 min.

Thanks to all who responded.
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Old 10-12-2009, 04:43 PM   #9
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Quote:
Originally Posted by HvacWiz View Post
Check for plugged condensate drain.

Will do. The furnace was a replacement, from an old boiler system, that ran the entire bldg. This is on the second floor and I don't recall seeing a drain.

Thanks again all!

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