Question about Heating & Cooling

1 Answer

Heat unit not blowing hot

I have an electric unit that is just blowing warm air. I checked the elements they seem ok but when I touch the outside of the box the top two are cold and the bottom one is just warm.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,214 Answers

Chances are the thermal fuse has blown on the two elements. This is very common on electric furnaces.
There may also be a reset-able temperature sensor.

Turn of the power and access the electrical connections of the heater elements. First, look for burned connections to any of the components, all the way back to and including the sequencer relays. It's very common for these to burn as well.

If all looks OK, then look for a round button about the size of a quarter on each of the elements. If there is a red button on top, press it, then test to see if all the elements heat up. If they don't, or there is not a reset button, then it's probably the thermal fuse, a little silver bullet shaped piece about 1/2 inch long, and 1/8 inch in diameter. Usually you must remove the burner from the heater casing by disconnecting the wires, removing the two screws, and sliding the element frame out.

The final problem can be one or both of the elements has broken, or one has broken, and the other has a blown thermal fuse.

It could also be blown power fuses which provide power for those particular elements. Check all the larger diameter fuses, and if any are bad, look deeper for the cause of the fuse failure. REPLACE WITH ONLY FUSES OF THE SAME RATING!

The sequencers have a habit of failing as well, and are harder to test. If all the above checks out OK, then replace the sequencers.

Please reply if you have additional questions. Please include the make and model of furnace as well.

Posted on Jan 16, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why does it just blow cool air?

Check outside condensing unit. Should feel warm to hot air blowing out of the top. If cool to outside air temperature blowing off you likely have a refrigerant problem

Apr 02, 2016 | Heating & Cooling

1 Answer

I have a whirlpool wall heat/ac unit, model ACE184XL0. All of a sudden, the heat quit working. Fan still blows, and AC still seems to work, although I can't tell if it's just pulling in cold outside air...

Dear it is a thermostat system. You can simply check it by setting temp at 30 then check either warm air is coming or cool air. at this time warm air should come. If warm air is not coming means there is a fault is realy in your pcb. It can be simply remove no need to worry.

Oct 14, 2013 | Whirlpool ACE244XS Air Conditioner

1 Answer

I have a Goodman PH030-10 packaged Central Heat/air unit electric temp outside is mid 30's it is 58 in the house and the unit is not shutting off, coils are clean the blower motor is running. I opened the...

I would have the charge checked and also have the electric backup coils checked....

It seems athough you have multiple problems.....


Dec 27, 2010 | Heating & Cooling

1 Answer

Carrier 38tkb not working, but furnace is blowing

It is probably a capacitor problem. Check inside the outside unit. you will see a round cylinder with three groups of terminals on top. If the top of it is dome shaped it probably needs to be replaced. You can check it if you have a microfared tester. However if it is poofed out it probably is bad. If this is not the problem you will probably have to replace the fan motor.

Jul 07, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Heater not working. have power going to heating element. I,m guessing there's a heater inside of the roof air conditioner because it has a heat or cool on control panel. I belive the number of unit is QC...

It may be capable of running heat element, but may not have been installed. Remove ceiling cover and you should see an element sometimes shaped similar to a light bulb, or maybe just a straight rod style, but it should be fairly obvious and be sticking out right where the air would blow into your rv, on discharge side of AC unit. Some of them weren't very powerful, so don't expect too much from it, as quite often you only feel slightly warmer air from discharge when they are on. It should have a plug running directly to control box, and be plugged in there. If it is there, turn it on, and see if you feel it getting warm by touch, carefully! If not getting warm/hot to touch, then either control box, faulty, or element is faulty. Checking voltage at that connector with multimeter on AC voltage when it is in the on position should tell you.

Apr 12, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Just blowing air not cooling, outside unit doesn't seem to be working but inside just blowing air

First off, check power:disconnect box outside may have fuses,then check power at fuse box.If you have power(220 volts) then check for 24 volts at T-stat line.Also, make sure T-stat is set to A.C.With power on go outside and listen to condenser unit.If fan is rotating listen for humming .If it is not running, it could be a bad contactor or a bad or capacitor .If it is running check after 5+ minutes if warm air is coming out of the outside unit.Also, wash the condenser unit:start by spraying the hose about 45 degrees downward ,going side to side,and down on all sides.Do Not use High pressure hoses,it will bend coil fins.After it runs for about an hour,or so, go out and see if low pressure line(big one) is sweating and cool, and high pressure line (small line) is warm.

Feb 23, 2010 | LG Heating & Cooling

1 Answer


Cooling comes from what is done outside, if air handler is blowing and you are hearing a sound , may be in the duct work. If you feel warm air in cooling mode then the outside unit is the prob, need more info

Jul 25, 2009 | Heating & Cooling

1 Answer

Our air conditioner seems to be working fine yet t won't blow cold air. Its just room temp air actually feels like you're standing in front of a small fan.

check outside unit large pipe should be cool or even very cold small pipe should be warm to touch that will eliminate some questions in order to solve problem also check circuit breaker for outdoor unit see if fan on outdooor unit is running and listen for compressor hum

Jul 02, 2009 | Sunbeam Heating & Cooling

1 Answer


I assume this is a heat pump. The outside unit may be icing up. It should have a defrost cycle with electronic control that sometimes fails or sensor associated with the electronic determination of when to defrost may have failed or may not be sensing because its out of position. You can check for a defrost problem. If frost is blocking the outside unit air will not pass through it after the frost builds up and you may be able to see the white frost as well. If all this is true you need to get a service manual and use its procedures to find out why the unit is not defrosting.

Jan 12, 2009 | Weather King 12AJA4801AH Air Conditioner

2 Answers


Sounds like a bad start run capacitor. The exhaust fan motor may be bad too. Be careful, this unit delivers 220volts of electricity.

Jun 17, 2008 | Goodman Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

103 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts


Level 3 Expert

2046 Answers

Dan Webster
Dan Webster

Level 3 Expert

8205 Answers

Cris Sparks
Cris Sparks

Level 2 Expert

338 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides