Question about Carrier 38CKC042 Air Conditioner

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Rudd furnace molel robd-150rbja worked good for 5 years now takes 24 hours to raise house temperature from 60 to 70 degrees burner fires properly then fan starts properly after about 5 mineuts of bott running normally the both stop at once leaving unit very hot 10 to 15 min later they start again

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Get it looked at quick, before your exchangers crack, because the furnace not cooling them down after operation will lead to failure, and the replacement is not cheap, close to the cost of a new unit.

Posted on Dec 06, 2008

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Posted on Jan 02, 2017

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I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up


The fan relay is stuck in the on position. When the temperature drops the heater does not ignite because the fan is already running and ignition is locked out after the heat cycle starts an the fan turns on

Nov 16, 2014 | Heating & Cooling

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Just cut on 8 year old Goodman CPLE24-1 AC for the summer. Ran 8 hours fine, Next morning noticed outside unit running, very little cool air blowing out of inside floor vents (like the blower fan was...


Due to the many different questions I see about Air Conditioning, I am including this overview to help us better understand each other for trouble shooting. A basic air conditioning system has a Thermostat, Air Handler or Furnace Fan and a Condensing unit. In a split system, the condensing unit (Condenser) is separate from the furnace and usually in the back yard. When working properly, it blows hot air. It connects to the cooling part of the system by 2 copper lines. One large line and 1 small line. The part that cools the house is the "Evaporator" and is usually on top of the furnace inside the square metal box (Plenum). When the Air Conditioner is running, the large copper line should be cold and the smaller line should be warm. Common signs of low refrigerant are that both lines are the same temperature and/or frost or ice has built up on the large line at the condenser. The thermostat will normally display room temperature on till it is touched to change the setting. It could have a "Span" setting as well as times and temperatures. The operating "span" of MOST residential thermostats is 40 to 90 degrees. That means you can set it as low as 40 degrees and no higher than 90 degrees. It probably has a fan switch also. When in the "ON" position, the fan will run constantly, 24 / 7, but the condenser will still cycle on and off as needed to keep the house at set point. If you have a suggestion to include in this paragraph, please let me know.

I think I have it covered above. Let me know if you need something more specific. Thank you. Roger

Apr 12, 2011 | Goodman CPLE24-1 Air Conditioner

1 Answer

We have a Rudd acheive 90 plus (11 years old) that fires but will not stay running. Any suggestions?


I have not worked on any Rudd 90s but in some furnaces a flame sensor on the opposite side from the igniter can get dirty. It looks like a 0.08 " wire sticking out of a ceramic holder.Cleaning the wire with scotchbright will often cure the problem . Good luck

Nov 04, 2009 | Ruud UBHC Air Conditioner

1 Answer

I recently bought a 4 ton 14.5 SEER Rudd Spilt system using R-410 and matching Rudd furnace. This system replaced a Lennox 10 SEER 4 ton unit. Now that it has gotten hot in Baton Rouge LA 90-93 degrees....


Sounds like the Unit might be low on charge.But without correct readings not sure.
The new unit with 410 will actually cool better due to higher boiling point temp. of freon type.Poor air circulation could also cause problem.Such as dirty filter, too slow fan speed,dirty coil.Also could have obstruction in freon lines either at pump,in line set,or in coil.
Get someone u trust to check it out and ask for their Rudd Dealership Training Credentials.

Jun 15, 2009 | Heating & Cooling

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Need info for RUDD upflow oil furnaces


Contact your nearest Ruud DISTRIBUTOR, usually The Noland Company, and ask them if they could go into the historical documents and print out or send you the files for the wiring, spec's and parts breakdown. From the model number, that unit is rated for 3 tons of a/c. You can find a 3 ton coil that will fit in the space and get a straight cool condenser of 3 tons cooling and swap thermostats so it brings on the furnace and fan in heat and the condenser and fan in cooling. Or just add a simple White - Rogers model 444 for the cooling. Ron

May 06, 2009 | Ruud UBHC Air Conditioner

1 Answer

I have a comfort zone furnace. If it's 50 degrees in the house, and i set my thermostat to 70 or so,it takes at least 24 hours to reach 70 degrees. The furnace starts up and runs normally for about five...


When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.

Apr 25, 2009 | Heating & Cooling

1 Answer

Heat temperature issues with Goodman GMP 100-4 furnace


69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.

Feb 21, 2009 | Goodman CPLE24-1 Air Conditioner

1 Answer

The burner lights for a few seconds and then shuts off


sounds like a bad limit switch in fire box or low airflow check air filter

Jan 04, 2009 | Ruud Handler Air Conditioner

1 Answer

Furnace won't stay on


Flame sensor could be dirty. It is located right beside the last burner looks like a thick piece of wire. Take steel wool and gently clean the probe 4 or 5 strokes is all it will take to take off the carbon build up off. Lets eliminate this item and see if it clears up okay. ken

Dec 21, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

How do i operate thermostat and furnace


if your furnace is on 24 hours straight, before it heats up your home, then either your cold weather and indoor temps are extreme, or your unit is grossly undersized. if however your furnace cycles on and off when the temp is still way colder than you have set it you have either a bad stat that thinks its hotter than it is, or a bad furnace problem and even though the furnace is getting a signal from the stat to heat it is failing to do so. you'll have to watch and think this through to isolate the problem. if you set the furnace to max heat and it runs and heats the house reasonably quick then its probably going to be a bad stat. if you set it to max heat and it shuts off way before it gets to setpoint then the problem is in the furnace. be sure filters are clean, blower wheel is clean , returns are no obstructed, etc. if you by chance have an old mercury bulb stat they had a thing in them called a heat anticipator which basically worked like this. a dial with a little pointer determined how soon it would be till the furnaced reached the desired temp and anticipated how soon to shut off the burners in anticipation of the cool down period so you dont overshoot the desired temp. if these are bad or moved to different setting they can short cycle the furnace on of on off etc. or shut down the burner almost as soon as it lights. setting is usually at .4 to .6 on most, but really a digital stat is only way to go. by the way check to be sure you don't have a hot air supply grill blowing directly on the stat or it will shut off as soon as stat gets hot and rest of house will be cold. usual location is 5 feet off floor directly over the main return air grill or under it as the case may be. good luck

Nov 10, 2008 | Weather King 12AJA6001AH Air Conditioner

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