When temp rises outside, cold air stops getting produced inside

by Nancy W
(Hoboken, NJ)

My central ac unit is approximately 5 years old, but has been used actively for 4 years (it was installed in a new condo - we are the first owners). It is model H1R0060S05H. The compressor is on the roof of the condo high rise I live in.


The central air conditioner unit works fine when the outside temperature is under around 85. After that, when the inside temp rises, the fan goes on, but the compressor does not. I have checked on the roof, and can see the fan blades turning, but no hot air is being released as I would expect if the compressor were on. In addition, no cold air is being released inside the apartment.


In time, the temperature rises indoors. Eventually (usually up to 1 hour), the compressor goes on and the apartment cools down to the set temp in about 1/2 hour. By this time, the indoor temp could be 7 or 8 degrees above the setting. This cycle repeats until the outdoor temperature falls.

We have had HVACs service, and they took measurements and said everything was fine. When the problem persisted, they came back, and diagnosed it as a capacitor problem. They replaced the capacitor, and that did not solve the problem.

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Very interesting information
by: Nancy W

that is very interesting. Wouldn't the part be covered by a warranty? I was told that parts were covered for 5 years.

the York number is on their web site. I spoke to a person there, Glenn Wolverton, who is their tech head, who recommended a dealer in my area (NJ). I will contact them with your info and see if I can get a reaction.

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Check the TXV valve
by: Masa

Mine AC is 4 years old. I am suffering from the exact same problem as you described that when the outside temperature is low enough it works, but it were high, it cannot cool down and the inside temp keep rising.

Technicians visited three times and fill up the refrigerant saying the system is working fine, nothing wrong, recommending a leakage testing which is not cheap. I felt it?s wrong! There shows the same symptom.

The real-root-cause definitely exists in somewhere so that at the third time visit I asked the technician to climb up the attic to look into the Evaporator Coils compartment. Bingo! The Metering Device (Thermal Expansion Valve: TXV), which control the flow of the refrigerant, was not properly working.

If the flow of the Freon gas were low, causing the compressor to overload and shut down it for protection, and obviously less capacity to cool down inside, hence, the inside temp goes up even though the entire fans keep working.

The service company quotes $1200 to replace the valve, but strongly recommended to a new system which won?t use the Freon gas, which will be terminated within 5 years, but will cost me $2500. I have not decided what to do yet. Hope this info will help you too.

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response to suggestions on kit and coil
by: Nancy W

Thanks for your suggestion. We do have a hard start kit built in to the unit.

Ref the coil, I will ask the technician tomorrow. Unfortunately, we do not have any water source on the roof that I can see; however, it might be worth a look at least. Thanks again.

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Hard Start
by: WHulme

Two things come to mind when I hear of this problem.
1) Does your outdoor condenser have a hard start kit? Most brands do not come with the start kit (due to the added cost).
2) You said the condenser was on the roof, is there a water spigot on your roof or accessible for a technician to attach a water hose to clean the outdoor condenser coil. These dry conditions and extremely hot weather we are seeing longer run times and very dirty condenser coils. Visually inspecting them they appear clear. But when you run the water over them you see muddy water being displaced from the coil.

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thanks for the suggestion - will let you know when solved
by: Nancy W

Thanks for adding me. I am having a service technician from York make a call later this week. I will add the update then.

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Compressor Shut Down
by: Dadan

The problem is the compressor come ON whenever, it wanted. “Eventually (usually up to 1 hour), the compressor goes on and the apartment cools down to the set temp in about 1/2 hour.” It sounds like the compressor is shutting down due to internal safety or it on pressure safety switch. I’m not sure if you have bad compressor or other factor, I haven’t thought of.

Sorry, I couldn’t help you, and I wish I was working on it. When the tech came up with a solution come back here and tell us.

Dadan

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