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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7746
Experience:  Furnace, A/C and heat pump specialist.
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OUTDOOR FAN HAS BEEN RUNNING FOR PAST HOUR AND INDOOR FAN

Customer Question

OUTDOOR FAN HAS BEEN RUNNING FOR PAST HOUR AND INDOOR FAN HAS NOT RUN IN THE PAST HOUR. THERE WAS A BUZZING IN THE INDOOR CABINET FOR A WHILE.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: LESS THAN A DAY
JA: Do you plan on doing the work yourself?
Customer: YES
JA: Anything else we should know to help you best?
Customer: IF I CHANGE THE INDOOR FAN FROM AUTO TO ON THE INDOOR FAN WILL RUN
Submitted: 26 days ago.
Category: HVAC
Expert:  airheatman replied 26 days ago.

What is model on indoor unit?

Customer: replied 26 days ago.
bcz36b12a-1
Customer: replied 26 days ago.
its an armstron
Expert:  airheatman replied 26 days ago.

Looking for a manual Let me ask this have you replaced batteries in thermostat? Usually G and Y are made through thermostat on call for ac

Customer: replied 26 days ago.
Not battery operated
Expert:  airheatman replied 26 days ago.

Indoor fan is brought on by thermostat in cool mode in most cases.I am suspecting issue may be with thermostat.What is model on the thermostat you have?

Customer: replied 26 days ago.
Expert:  airheatman replied 26 days ago.

Since you can urn fan to on and make it work I am pretty confident the issue is a bad thermostat.

The thermostat is like a light switch. Power comes to thermostat on RED to R.

On call for ac Red R, Green G and Y Yellow should all be energized through the thermostat.

When you turn fan to on you are manually closing r and G which should be done through thermostat in ac mode.

Customer: replied 26 days ago.
Since opening t/stat cover, comp has come on and a hum in indoor cabinet on "auto". Fan has not started though
Customer: replied 26 days ago.
Hum just abruptly stopped
Customer: replied 26 days ago.
Compressor no longer on . Condenser fan is on
Customer: replied 26 days ago.
Temp not cool enough to be in defrost. Indoor fan is on now in auto mode
Expert:  airheatman replied 26 days ago.

Compressor may have short cycled because of us messing with thermostat.It should come back on shortly

Expert:  airheatman replied 26 days ago.

Do you see a wiring diagram on indoor unit? I have not been able to locate one

Customer: replied 26 days ago.
attached
Customer: replied 26 days ago.
Control circuit
Expert:  airheatman replied 26 days ago.

I am about to eave office for tonight, I will open to other experts and check tomorrow to see if you got this solved.

Expert:  airheatman replied 26 days ago.

I see no one was able to help.I am back in office,The diagram appears to be for heat kit. I am trying to figure if your air handler may have a different relay for the blower for ac than fan only.Usuually s mentioned thermostat is what signals fan ,So I am still leaning to thermostat being problem

Customer: replied 26 days ago.
About midnight I was out back at unit and cycle breaker. Fan came back on. Tapped contactor and fan went off. Suspect contactor and removed it this morning.
Expert:  airheatman replied 26 days ago.

Hmm. You going to get a contactor today and replace it? If you have a meter you can verify 24v is actually getting to it on call for cool. If it is and not energizing we know that is bad

Customer: replied 26 days ago.
I'm pretty sure this is the culprit. I put it in six years ago. Time for new one.
Expert:  airheatman replied 26 days ago.

Definitely. When the points pit like that sometimes voltage sneaks through and sometimes it does not.Lets replace it and I am here everyday if you have any more issues.

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