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Old 12-05-2009, 05:55 PM   #1
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Ruud help


I've a 13 year old Ruud air conditioning system includes cooler and heater. It works well untill 2 days ago, the heater stopped. When I turn it on, the blower works without heat. The Ruud model number is RCBA 4882 GG21 (also found anther model number UBHÁ J20SFCA). Please tell me what is wrong and how to fix it. Thank you.

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Old 12-05-2009, 06:27 PM   #2
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Ruud help


The limit control is probably blown from lack of airflow. Not sure where it is on your unit. Somewhere close to the burners and above them.

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Old 12-05-2009, 09:46 PM   #3
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Thank you for your answer, Mr. Yuri. But the air out of the vent is strong. I don't think the problem is from the air flow control. Maybe there is something wrong with the burner. Can they be broken? How can know the burner work or not and how to replace them.
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Old 12-05-2009, 10:47 PM   #4
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When a limit is tripped the blower comes on as a safety to cool the unit down. If the blower comes on right away then the limit is probably bad. Yuri was stating the most common cause of a limit failure,bad airflow. Test it with a meter to find out for sure.
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