HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

My compressor is shutting off while the handler keeps

Customer Question
Hi! My compressor is shutting...
Hi! My compressor is shutting off while the handler keeps running. It is only happening when outside Temps reach ~100f. Water mist on outside unit keeps it on. I've had a tech out 3 times this week. 1st trip found low refrigerant but he couldn't replicate problem. 2nd trip he replaced the fan motor. 3rd trip same day he replaced the high pressure switch. It is still doing it and he's coming back in the morning but I'm already $800 into this. I don't want to be mad but I'm almost out of money to fix this. I have a York but dont know the model. Any suggestions?? Thanks, T
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 12 hours by:
8/29/2015
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,168
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello,

Tell me about how old the unit is... and if you have used the water hose to clean the condenser coil or not by forcing water between the fins of the condensing unit coil.

It may have a clogged condenser, or it may have been over charged with refrigerant.

We can go from here without any time limits.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
It's about 10 years old. Yes, I clean the condenser coil pretty often especially this time of year with the monsoon-dust storms.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

Thanks,

This technician is not particularly incorrect at all, his guesses were valid. However if he had verified the compressor discharge pressure with real or simulated 100+ weather he would have known whether to replace the high pressure cut out switch or not.

Since he may not have done that, and if he or someone else had worked on the system before this problem began, it is quite likely that the system is over charged with refrigerant, especially if it is a heat pump, and was worked on the winter.

Let me know about all that, we can go from there without a time limit.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
The prevailing theory is that there is a partial clog in the refrigerant line and that was causing false pressure readings. He said this unit has a strainer where the refrigerant is distributed through the outside coils. He said there's another at the expansion valve on the inside unit. Thoughts??
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

Hello again,

No clogg what so ever in the refrigerant lines will result in high head pressure. That is a very common misconception... based on the idea that if the refrigerant flow is restricted, refrigerant GAS will back up into the condenser coil and cause the high head pressure.

However, in the condenser coil the hot gas is *condensed* into a liquid, the volume then shrinks and the head pressure actually *drops*

There is one fairly rare exception... that is when the condenser is a *micro channel* type instead of a tube and fin type.

Here is a video on the topic... tell me if you have a micro channel type coil or not.

https://www.youtube.com/watch?v=Q0VhglEz_as

Watch this video above first. Micro channel use has since been discontinued by a number of system manufacturers.

https://www.youtube.com/watch?v=-cJtnSsuUSA

In that case, your tech has about a 20% chance of being correct. (that is a 1 in 5 chance) in his view that there is a restriction in the refrigerant liquid line.

You can tell by inspecting the condenser on your unit if it is micro channel or not... if it is not micro channel, then your tech in this case is a little short on training and experience and he or someone before him has over charged your system with refrigerant.

-----------

We are on the honor system here. Please remember to rate my service before you leave today, the company only pays me if you rate my work. It is how I earn a living, and does not increase your charges.

If you need anything else, just let me know. You can continue asking follow-up questions at no additional cost.

Ask Your Own HVAC Question
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,168
9,168 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

9,168 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
Condenser contractor chattering is it bad? Just notice
We had very cold weather down to 10 degrees, fan not been running until today thouzght was running's. On heat strips. … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a GSZ130421AE condensing unit and ARUF486016CA air
I have a GSZ130421AE condensing unit and ARUF486016CA air handler. The heat pump intermittently comes on and may operate a few minutes. When it stops operating, the air handler continues to run until … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I'm installing a condensation pump for a friend, he has dual
I'm installing a condensation pump for a friend, he has dual zones and the condensation pump has a after switch. The thermostat has ABCD connections. I need the common and normally open connections an… read more
Phil
Phil
Mechanical Engineer
9,168 satisfied customers
I replaced my defective Condenser fan. The 3 wiring hookup
I replaced my defective Condenser fan. The 3 wiring hookup on the defective is black to power, purple to defrost board and brown to dual capacitor. The replacement fan a MARS 10728 has four wires. Uns… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Can a condensate pump be used on a 100 gallon a o water
can a condensate pump be used on a 100 gallon a o smith water heater with a pvc horizontal vent system it is a 1/2" outlet at the bottom of heater … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My heat pump condenser coil are freezing up during this
my heat pump condenser coil are freezing up during this latest cold spell, can I thall them by using my aux mode … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have aTrane XE 1200 AC and as of yesterday the condenser
I have aTrane XE 1200 AC and as of yesterday the condenser fan and compressor won't shut off. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
All my windows have condensation. Can I turn off the water
All my windows have condensation. Can I turn off the water to my G3203-75-2 to lower the humidity? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Does it make sense that the outside condenser unit for the
Does it make sense that the outside condenser unit for the second story of our split HVAC system is 3.5 ton but the evaporator unit in the attic is 4 ton?… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My high efficiency condensing furnace (Carrier) emits a
My high efficiency condensing furnace (Carrier) emits a terrible eye-stinging odor when heating. The furnace runs quiet and otherwise appears to be trouble free, however I see (and smell) a fresh (wet… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
Can I have a condensing furnace in a garage that's only
Can I have a condensing furnace in a garage that's only heated a couple days out of the week? I can install it inside the conditioned space but do I have to keep the garage heated all the time or can … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I HAVE A 5 TON CONDENSE UNIT MODEL #M0H40D72C SERIAL
I HAVE A 5 TON CONDENSE UNIT MODEL #M0H40D72C SERIAL #702H02997 THAT THE COMPRESSOR WAS RECENTLY REPLACED BUT i STILL HAVE A ISSUE WITH IT IT CRANKS BUT IT STOPS AFTER 45 SECONDS NEED HELPWITH THIS IS… read more
R G
R G
44 satisfied customers
I have a heat pump condense unit and it has made this loud
I have a heat pump condense unit and it has made this loud tat tat tat tat tat tat noise (when in heat mode) when it turns on or off. It goes from the condenser unit all the way to hearing in the blow… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have a replacement condenser from Goodman, the original
i have a replacement condenser from Goodman, the original was a variable speed and they have since discontinued it and as a warranty replacement they sent me a different condenser and the wiring is to… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Condenser not running checked all breakers and thermostat
condenser not running checked all breakers and thermostat settings … read more
travis webb
travis webb
tech.
2,414 satisfied customers
Condensate pump for a-c in split system ran continuously and
Condensate pump for a-c in split system ran continuously and now Lennox furnace Model GS18Q314E-100-5 will not come on. … read more
Phil
Phil
Mechanical Engineer
9,168 satisfied customers
Moved into our new home and they added an AC condenser. In
Moved into our new home and they added an AC condenser. In the mechanical room there is a bundle of three wires that are not hooked up to the main board of the furnace. The bundle goes to the AC conde… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I'm gathering information on wall hung non-condensing
Hi. I'm gathering information on wall hung non-condensing boilers. I am the president of my Brooklyn co-op. We have 8 units in our building and each unit has it's own wall hung (Baxi) non condensing b… read more
Phil
Phil
Mechanical Engineer
9,168 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x