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Question

The blower on my ac unit runs fine when in the on position, but when the A/C is turned on the blower shuts off. What could be causing this problem

Submitted: 237 days and 5 hours ago.

Category: HVAC

Value: $9

Status: AWAITING CUSTOMER ACTION

Posted by Mark Henley 237 days and 5 hours ago.

Answer

Hi,

That's an odd one because it is the same signal through the G terminal of the thermostat that controls the blower in both modes.

Do this,

Remove the front of the thermostat and jumper the R terminal to the G terminal. The fan should come on and stay on until you remove the jumper.

Let me know what happens, basically if that works then you have a bad thermostat that isn't making the R to G switch in cooling but does it on the system switch, another thing to try would be to run the cooling and leave the fan switch in the ON position and see if it runs.

Let me know

Thanks

Mark.

237 days and 5 hours ago.

Reply

The fan is currently running and in the on position on the thermostat. When the cooling is selected it shuts the fan off. I wil ltry the jumper option now and reply back if it doesnt work.

Answer

Hi,

Reply back either way , so we can determine what is going on. These are just troubleshooting procedures and the info will help.

Thanks

Mark.

Accepts:
Expert:	Mark Henley
Pos. Feedback:	99.2 %
Answered:	3/29/2009

Journeyman Technician

UA Journeyman Pipefitter , HVAC, Refrigeration, DDC controls. 26 years.Commercial & residential

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Have your own HVAC question?

Question

The blower on my ac unit runs fine when in the on position, but when the A/C is turned on the blower shuts off. What could be causing this problem

Answer

Reply

The fan is currently running and in the on position on the thermostat. When the cooling is selected it shuts the fan off. I wil ltry the jumper option now and reply back if it doesnt work.

Answer

Hi, Reply back either way , so we can determine what is going on. These are just troubleshooting procedures and the info will help. Thanks Mark.

Related HVAC Questions

Hi,

Reply back either way , so we can determine what is going on. These are just troubleshooting procedures and the info will help.

Thanks

Mark.