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Bart Jay
Bart Jay, HVAC Technician
Category: HVAC
Satisfied Customers: 655
Experience:  35 years in HVAC. NATE Certified EPA certified
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Fan in outside unit keeps turning on and off, circulation fan

Resolved Question:

Fan in outside unit keeps turning on and off, circulation fan inside comes on, but house not cooling. What is the problem?
Submitted: 6 years ago.
Category: HVAC
Expert:  Bart Jay replied 6 years ago.
Chat Conversation Started
Bart Jay :

Are you at the house now

Bart Jay :

Does it sound like the compressor is running

JACUSTOMER-exx9xk2l- :

Yes, I am out the house. Yes it sounds like the compressor is running. It makes a buzzing noise and the fan stops.

JACUSTOMER-exx9xk2l- :

I meant I am at the house.

Bart Jay :

it is probably cycling on low or high pressure

Bart Jay :

can you go outside and feel the smaller copper pipe while it is going on and off

Bart Jay :

let me know if it is cool,warm,or hot

JACUSTOMER-exx9xk2l- :

I don't know what that means

Bart Jay :

do the same with the larger insulated pipe

JACUSTOMER-exx9xk2l- :

okay i will go check it

Bart Jay :

should be cold

JACUSTOMER-exx9xk2l- :

The smaller copper pipe is hot.

Bart Jay :

sounds like the fan motor is overheating and shutting off on its internal overload

Bart Jay :

do you have an amp probe meter

Bart Jay :

how long does the fan run before shutting off and how long is it off for

JACUSTOMER-exx9xk2l- :

The larger insulated pipe is cool. I only turned the unit on when you told me to check it. The larger pipe is cool. It turns off with a grinding noise then back on. I think I have an amp probe. it shuts off about every 1-2 minutes.

JACUSTOMER-exx9xk2l- :

it goes off about 1-2 seconds, and then it goes back on

JACUSTOMER-exx9xk2l- :

I have a tester that reads amps ohms and voltages

Bart Jay :

If you can check the amp draw of the motor and see if it is overdrawing then you know for sure

Bart Jay :

opne the unit find the wire that feed the fan motor and clamp the meter aropund it.

Bart Jay :

check the name plate on the unit to see what the amp draw should be

JACUSTOMER-exx9xk2l- :

how do i do that, I am a girl, can you be more specific lol

JACUSTOMER-exx9xk2l- :

ok i will do that

JACUSTOMER-exx9xk2l- :

by the way now the copper pipe is cool

Bart Jay :

i know girls who are hvac techs

Bart Jay :

thank correct when it is off

JACUSTOMER-exx9xk2l- :

I put it on the two wires that went down toward fan and it popped, tripped the breaker, and melted the prongs

Bart Jay :

thats not good

Bart Jay :

what prongs melted

JACUSTOMER-exx9xk2l- :

Well, I am not one, but I could be, but I really dont want to be a tech. So I should turn all the power off and try it again?

JACUSTOMER-exx9xk2l- :

The metal ones on the tester the ends melted a little

Bart Jay :

yes just reset the breaker and see what happnes

Bart Jay :

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Bart Jay :

sorry

JACUSTOMER-exx9xk2l- :

well, I switched the breaker back on. but the air conditioner is still doing the same thing

Bart Jay :

does you meter look like this one with an opneing to clamp around a wire

JACUSTOMER-exx9xk2l- :

no it didn't look like that. it has metal prongs at the end

Bart Jay :

then you cant measure AC amps

Bart Jay :

I think you did something wrong

Bart Jay :

anyway back to the original problem i think the motor is bad

Bart Jay :

you sound it sounded like it was grinding also. correct

Bart Jay :

you said

JACUSTOMER-exx9xk2l- :

it only grinds for a second when it shuts off

Bart Jay :

is the small copper pipe hot when the fan is running

JACUSTOMER-exx9xk2l- :

they are both cool not cold and the fan has been running

Bart Jay :

and then the fan stops and the small one gets hot? or does the small one get hot and then the fan stopps

JACUSTOMER-exx9xk2l- :

it runs for two minutes turns off for a second and then turns back on. the pipes are both cool not cold

Bart Jay :

Sorry got called away

Bart Jay :

I think that it may be low on freon.

Bart Jay :

the low pressure switch is a safty devise and it is tuning it off becuse the pressures are too low

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