How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask airheatman Your Own Question
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7743
Experience:  Furnace, A/C and heat pump specialist.
16514686
Type Your HVAC Question Here...
airheatman is online now
A new question is answered every 9 seconds

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: 5 months ago.
Category: HVAC
Expert:  airheatman replied 5 months 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 5 months ago.
the a/c unit will not cool thevhousr
Expert:  airheatman replied 5 months ago.

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

Customer: replied 5 months ago.
The outside will stop working the will turn on in an hour
Expert:  airheatman replied 5 months ago.

OK outside is going off before the thermostat temp comes down

Customer: replied 5 months ago.
Customer: replied 5 months ago.
The outside will stop before the temperature will go down
Expert:  airheatman replied 5 months 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 5 months ago.
both quit at the same time
Expert:  airheatman replied 5 months ago.

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

Customer: replied 5 months ago.
both come back after a while
Expert:  airheatman replied 5 months 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 5 months ago.
There is no float
Expert:  airheatman replied 5 months 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 5 months ago.
Okay, guide
Expert:  airheatman replied 5 months ago.

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

Customer: replied 5 months ago.
Sorry I'm at he house
Expert:  airheatman replied 5 months 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 5 months ago.
Not at he house
Customer: replied 5 months ago.
Thanks I will figure out from here later
Expert:  airheatman replied 5 months 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 5 months ago.
Okay
Expert:  airheatman replied 5 months 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 5 months ago.

Wires where they enter unit