20 Most Recent Goodman CLT48AER48 Air Conditioner Questions & Answers

Is the condenser coils clean..... If not take a hose and wash the condenser coils But make sure you shut the Main power off to it. Has the unit been charged with Freon lately??? If so they may have gotten it overcharged which will cause High head pressure and make the compressor noisy..... Or is it out of level and not setting on a stable surface. causing a vibration noise. You can put rubber pads under the AC if it is a vibration noise...... Also the Compressor may be going out..... It is hard to tell with out hearing it first hand....Hope this helps If you can't get it to quite down I would setup a Service Call to have them Service the AC and that you are having a loud noise coming from the unit....

this is possible only if there is a Low Pressure Switch on the unit. Most residential units do not have those but it is possible. I'd look else where, such as thermostat for starters.

That means the system has equal pressure on both sides, compressor is not running

Check voltage at the load side of the contactor. Check continuity of the compressor windings. Disconnect the power first. Connect one lead of the ohmmeter to Common, then connect the other to the Run winding and read meter, then connect to the Start winding and read meter. Neither should indicate an open leg.

Is the hole on the outside unit. If may be to stop the condensate drain pipe from freezing on the elbow. Google Goodman (model) installation manual https://www.google.com/search?q=%E2%80%8BGoodman+(model)+installation+manual ..

Probably the cap or lost a leg

Check here...page 8https://www.theacoutlet.com/documents/Installation-Guide-Goodman-MBVC.pdfwoops you"ll have to copy and paste the link ):

Maybe ck here... https://www.youtube.com/watch?v=QvRur9MP3Cg

no. it could be the breaker is getting weak or you have problem with unit.

thermostat bad or wiring

Dirty condenser or slow or not running condenser fan. What are the pressures?

https://hvac-boss.com/troubleshooting/goodman-furnace-error-codes/ According to this page, you can usually fix this 4 blink diagnosed problem by changing the air filter or tightening wiring (which it has a cautionary warning about tightening such too much) and checking the flue for blockage. The furnace has activated the primary open limit circuit. Here is a troubleshooting page about the Goodman just blowing cold air: https://temperaturemaster.com/goodman-furnace-troubleshooting/#Goodman_Furnace_Blowing_Cold_Air Poor air flow in the Goodman caused by blockages can result in the tripping of the rollover switches which would cause it to blow cold air. That is a safety measure. You don't want gas furnaces burning with insufficient air. Think carbon monoxide. Besides the air filter, the flame sensor or the burner could be dirty. The idea of trying to DYI that cleaning job is rather off putting. I hope changing the filter would work. I trust it is not a fuse in the pilot flame sensor circuit blown. A repairman has the voltage testers for checking the electronics involved. I can empathize with this. My furnace, another brand, went out recently. The repair man didn't know why it went out but simply adjusted a handle controlling gas flow to a position slightly different from what was recommended and it worked. All for $200. https://www.repairclinic.com/RepairHelp/Furnace-Repair/36-377--/Goodman-Furnace-Troubleshooting https://www.youtube.com/watch?v=zO1jKqwXu8s https://www.goodmanmfg.com/products/gas-furnaces

Power it off for 5 minutes, and then power it back on. Some ideas in the link. https://www.google.com/search?q=Goodman+furnace+blowing+cold+air ..

Obvious that the unit isn't getting gas to the ignitor. To receive gas to the ignitor, there is a gas valve located upstream of the burners. Have a friend turn on the heat while you are up close to the furnace. Once the ignitor gets hot, there will be an audible "click" at the gas valve when the low voltage controls call for the gas valve to open to supply gas to the burners. Listen for it. If you hear a click, and the furnace still isn't firing, you need to check to see if someone has closed the gas shut off supply valves located on the gas line. If all the shut off valves are open, you need to verify you have gas pressure in front of the gas regulator. If you verify have pressure on the upstream side of the regulator, you will need to verify there is also pressure downstream of the regulator. If there is gas pressure upstream but none downstream, replace the regulator. If you have pressure downstream of the regulator, and the gas valve clicks, but furnace doesn't light, replace the gas valve. LP has higher pressure than natural gas, and is dangerous. LP is heavier than air and will sink to the floor or lowest area. One static electricity spark is all it takes and an explosion can occur.

check the flame sensor connections . sounds like a sensor problem . check air filter is clean

Check out the pressure switch .

Question edited for typos.Gas furnaces has safety features to prevent explosions. If anything is thought to be faulty, nothing works. All gas appliances must be repaired by a registered gas technician. The two pressure switches are $76 and $29 if you want to risk it.https://www.goodmanparts.net/category/goodman-gmv950905dxa-gas-furnace-oem-repair-partsThere is videos and help here. Check the hose on the pressure switch.https://www.google.com/search?q=Goodman+GMV950905DXA++low+fire+pressure+switch+stuck+open..

the black and white might be swapped it wont show rectafication and flame sensor

I have the same problem. The vent flu. Is building up condensation and running back into the furnace and cloggs the little black vent hose with water. Then it comes back on then off etc. somehow the trick is to make as straight of an upward vent flu as possible ( definitely not 45 degree elbows and really not 60's either) seal all connections with glue.