We have a system that is almost 5 years old, but it has never worked properly in heat waves. Right now it can keep up at 70 degrees setpoint with 80-85 outside. The last couple of days it could not keep up the outdoor temp was 95-98 and indoors we were 76-78 and humid...I had Sears come out to give us an estimate to upgrade the unit, but they said it is sized properly...Help!
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Re: ongoing a/c issues
Wow! a 20 degree difference from inside to the outside? That is pretty amazing for a unit to operate that efficiently at such a high temperature. If the unit is cooling that well, it would also be dehumidifying. But at that high of an ambient which probably occurred between 4PM and 8PM, the peak heat of day, no a/c is going to do any better than that,(that I am aware of). Save your money, strip down to your skivvies, jump in your pool,have a cool drink, relax, and be thankful you have such a wonderful a/c.
If this advice works for you,please acknowledge your satisfaction by giving me your rating opinion,(and an invitation to your house when my a/c quits working above 96 degrees...LOL)
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Have you cleaned the air return filters ? Wash them, don't vacuum or brush them. It damages the filter screen. Sometimes a thermostat will be out by a few degrees. If the filters are clean, try turning the temp down a bit to 65 degrees and see if the air con shuts down. ( If your room temp is showing 70, it should switch off the machine) If it doesn't turn off, keep reducing the temp by 5 degrees at a time and wait a few minutes each movement to see if and when it shuts down. If the machine keeps running, I would suggest your thermostat is shot and you will need a new one.
Its a tankless heater. It will heat water as long as it senses a large enough flow of water. Either the flow sensor is bad, or not sensitive enough, or you are using less water than it is set to work at. Try keeping a large flow running. Instead of a trickle, shut it off entirely.
If your system is a heat pump and is failing to keep up overnight during the colder weather. Or if it struggles to keep up at all, a few issues come to mind.
Obviously, the first and most common cause would be due to an undercharge of refrigerant. With an undercharge, your heat pump has lost efficiency and cannot properly remove heat from outside.
Other possible issues that come to mind are failed defrost cycle. If your unit is not defrosting properly and it continues to run non-stop, a freeze-up could occur on the outdoor coil. And the worse it gets, the worse your system will perform.
Another possibility is auxiliary heat or heat strips are not coming on at all. Depending on your thermostat, you would be able to tell if the thermostat is calling for auxiliary heat. If you are not getting any additional heat, then the heat pump may not be adequate for the space intended.
Other smaller factors may come into play such as incorrect defrost cycles. Possibly a mechanical component taking a break or overheating or maybe a mechanical failure such as failed compressor leaving the only heat you have as emergency.
Sounds like your ceramic ignitors have worn out - apparently they are to be replaced every 3-5 years - so if you've gone 10 this could be your issue (it was mine). I have two in the larger oven & 1in the smaller one. Easy to replace (60$/each) - two wire and one screw each. When they fail to heat up properly the gas valve doesn't open fully, or won't open at all.
Also I'd clean the burners when in there ... mine corroded a bit and required brass wire brushing. There is a small **** on the burner that had filled in (width of a piece of paper) which prevented the flame from moving to the opposite side of the burner - so essentially only one side of the burner lit.
I dont know where you are located but anything bellow 45 degrees a heat pump does not put out much heat. As it gets colder the effeciency goes down. So if you have 24,000 at 60 degrees outside at 45 it is 15,000. Now first thing have the charge checked. If a unit is one pound low it can loose 20 %. Next see if your auxilary heat is working . You have at leat 8 KW backup heat.This comes on the second stage about 2 degrees or 2 to 4 minutes behing the Hat Pump. Ask service tech for free estimate or call and get season check. They will go thru your unit and check everything and let you know what wrong and also clean the system. Cost about 49.00 to 69.00. I own a business and we sell a maintanance contract for 105.00 and check and clean the system twice a year.Keep in touch Rus
The pressure changes with temperature, it is not a true gauge to ensure a proper charge.
You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)
Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)
it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.
( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)