Question about Heating & Cooling
This is typically caused by a lack of combustion air. Does this unit have a powered combustion fan motor? If so, check to see if the motor is running. If it is running, then the motor wheel that moves the air may be failed.
If the motor is not running, the motor may have failed, or, it could be a control board failure.
- If it does not have a combustion fan motor, ( or even if it does ) You may have a cracked heat exchanger. A failed heat exhanger, will allow indoor air preasure into the exchanger, causing (flame rollout) that will trip the safety switch.
Try this, it would help me to know what type and model of unit it is.
Posted on Dec 30, 2010
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Posted on Jan 02, 2017
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