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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8369
Experience:  Furnace, A/C and heat pump specialist.
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A/C unit will stay on, Yes, Yes, ths thermostat is rite temp

Customer Question

A/C unit will stay on
JA: Did you double-check the thermostat? And what about the unit's filters?
Customer: Yes
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: ths thermostat is rite temp 6030
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Tell me exactly what is going on and what you mean C unit will stay on. Does indoor shut off but outdoor keep running or what?

Customer: replied 1 year ago.
the a/c unit will not cool thevhousr
Expert:  airheatman replied 1 year ago.

OK so thermostat is not ever reaching the temp you ask for, but unit (both inside and out run nonstop)?

Customer: replied 1 year ago.
The outside will stop working the will turn on in an hour
Expert:  airheatman replied 1 year ago.

OK outside is going off before the thermostat temp comes down

Customer: replied 1 year ago.
Customer: replied 1 year ago.
The outside will stop before the temperature will go down
Expert:  airheatman replied 1 year ago.

OK .That points us to an issue with the outdoor unit. Here are a few things that may be the cause.

1,Outdoor fan shutting down causing pressures to rise and shut off compressor

2.Restriction in refrigerant line

3.Improper refrigerant charge

4.Compressor windings opening.

5.Weak capacitor

So Lets start with the outdoor fan. Does the outdoor fan stop before the compressor or do both fan outside and compressor quit at same time?

Customer: replied 1 year ago.
both quit at the same time
Expert:  airheatman replied 1 year ago.

OK do you have to ret breaker or do both comeback on after awhile?

Customer: replied 1 year ago.
both come back after a while
Expert:  airheatman replied 1 year ago.

OK lets next look at the most obvious that will not require tools. Take a look in your main drain line (PVC) and see if maybe there is a float switch.Often a drain will become partially blocked backing up and causing float switch to kill signal to outdoor unit.As water seeps out, float switch closes and allows outdoor to come back on. See below

Customer: replied 1 year ago.
There is no float
Expert:  airheatman replied 1 year ago.

OK from here we need a meter to check when unit shuts off to see if we are losing the 24v at contactors and if so tracing to find where we are losing it.If you don't have a meter

You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.

http://www.walmart.com/ip/Innova-3300-Equus-3300-Hands-free-Digital-Multimeter/14644665

Customer: replied 1 year ago.
Okay, guide
Expert:  airheatman replied 1 year ago.

OK is unit currently off with thermostat calling for cool to be on?

Customer: replied 1 year ago.
Sorry I'm at he house
Expert:  airheatman replied 1 year ago.

In the outdoor unit you will find a set of contactors. We should have 230v into the contactor 24 v to col on side of contactor and 230v out of contactor when thermostat is calling for COOl.

Customer: replied 1 year ago.
Not at he house
Customer: replied 1 year ago.
Thanks I will figure out from here later
Expert:  airheatman replied 1 year ago.

I will type up a list of what to check and you can come back when you get a chance if you would like.

Customer: replied 1 year ago.
Okay
Expert:  airheatman replied 1 year ago.

1. Check the 230 volts into contactor

2.Check the 230 v out of contactor

3.Check the 24v to contactor coil

4.Check for 24 volts between the two wires (R and C) from thermostat where they first enter the outdoor unit.

5.Check at the indoor unit where wires leave going outside for 24v between those 2 control wires

6.Go to thermostat and put a jumper from R to Y and see if outdoor comes on.

If you can check each of these in this order and let me now results that will help me assist in determining problem.

I will attach a few photos to help you.

Expert:  airheatman replied 1 year ago.

Wires where they enter unit