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Booster Motor Stayes on after end of heating cycle

This is intermintent but leaves the unit from restarting when calling for heat

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Check the following: Flame sensor, this is a lil probe somewhere next to your ignitor. It senses flame and will cause the inducer/booster fan to keep running. Check continuity between your limits on the exchangers, and the main auxilary limit, if a broken circuit then it will also cause the unit to act eratically. If those check out, try your pressure switch, when the heating cycle begins ensure your getting 24 volts in one leg and out the other.

Posted on Dec 05, 2008

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Most air cons now have temperature sensors all over the machine. When it reaches temp on heat cycle, the machine usually shuts down both indoor and outdoor units but the indoor unit will keep running for a few minutes with the fan on only to cool the indoor unit down. This prevents the unit reading the wrong temperature. It stops the sensor(s) reading the heat from the indoor unit rather than the heat in the air in the room.

Jan 04, 2016 | Air Conditioners

1 Answer

Outdoor not running

First things first When a unit wont run turn it off!!! When a capacitor fails the motor will not start but power is still going to the motor . The motor will continue to build heat until the thermal overloads cut it off. When it cools down it comes back on and the process will be repeated over and over. In a package unit or air handler with heat strips the heat goes through the same cycles. Heat strips are thermally protected to turn off when there is no air flow to carry the heat away. Back to the motor not running. If it's a GE X13 non capacitor motor you need a new motor, in warranty you pay the for service call and installation. Out of warranty $560 plus installation.
Other units check the capacitor ,it should be flat on top where the wires plug on-Failed it will be swelled and rounded a little.

Mar 07, 2014 | Hitachi Air Conditioners

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Hi, not knowing what kind of unit you have, I can say this...., if it is the combustion motor at the indoor unit if this is what you have, on a call for heat the 1st thing that comes on in the sequence of operation is the inducer/combustion motor. It should have a poly type hose or tube coming off of it and going over to what is called a pressure switch. It has a single set of N/open set of contacts that have to close before anything else will take place. This is where you need to start. You can take a piece of jumper wire and jump across this switch, and if it is stuck open it will fire up, IF this is the problem. If it fires up, remove the jumper wire and check the hose for kinks, holes, ect. Pull the hose off of the motor end and blow in and out on it to see if you can free up this switch. If not, and it did fire up when you jumped it out, replace it. It is a safety, so do not leave it jumped out to run. Get a switch at a appliance parts house. If this is not your case, send me the name , model & serial number of the unit, and we can go from there.
A/C, & Heating Contractor

Feb 18, 2011 | Air Conditioners

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My amana heat pump will start and run momentarily and stop several times, and eventually it works, the house stays at 70 degrees so it works but this does not sound right what's the problem if any?

Hi; I need more info. Do You mean the outdoor unit is stoping and starting while running in a call for heat by the tstat. When heat pumps run if the temperature out side reaches low enough the outside unit will go into a defrost cycle to remove any build up of frost or ice. If the outdoor unit has a dirty coil or a low freon issue this also can trick the unit into a premature defrost cycle. Now here is another scenerio.If Your ac is running in the cool mode and stops prematurly there could be several problems. Low freon level, faulty fan motor causing the compressor to go into a freon bypass mode wich sounds very spewy. Please tell me if you are in heat mode.. Also how old is the unit. Sometimes a severly worn control contactor can disallow all the needed voltage to cross over to Your fan motor and compressor. Watch unit while its acting up... Also when unit goes into a sceduled defrost the fan will stop this is normal and will restart when the unit comes out off defrost You will here this big swoosh sound. Thats the freon being redirected back into the heating path.Let me know...alpharome416

Jan 22, 2010 | Air Conditioners

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If the weather outside is cold and you are running the heatpump/aircondition. Is the fan motor on the outside suppose to stop running. I notice the there is heat coming from the unit after it as been...

yes the fan will shut down during the defrost cycle. But the fan only shuts down during this cycle....other than defrost the outdoor fan motor should be running during a call for heat.

Jan 07, 2010 | Amana Air Conditioners

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Pilot light will not ignite to start heat cycle, a/c works unit will begin but will cut off w/out going into full heat and w/out blowing, new unit installed mid summer, heat has been working fine

Get to your funace and check inspection window on furnace. Small hole covered by glass. Check how many time the light blinks inside and that will tell you the problem. Get back to me and I will walk you thru this. Also kill power to your furnace and try to restart unit. Please call back and let me know. Rus

Dec 05, 2009 | Air Conditioners

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After a cooling cycle, when the thermostat call for more cooling, it take up to 5 minutes after the air handler starts for the compressor motor to restart. The top fan operates on the outside unit, but...

No, this cycle cannot be shortened due to the simple fact that this feature is in place to protect your system. Even if it could be, I wouldn't recommend it.

Jul 17, 2009 | Coleman Air Conditioners

1 Answer

Heat does not work when thermostat calls for heat...

This is a safty limit switch. Find two wires that are going to the inducer or combustion blower that terminates to a small disk about the size of a penny. In the middle of those two wires should be a small button. Push firmly down thus reseting the switch. This should do it. It could also be the pressure switch but I have never heard it called that before. If the first doesn't fix the issue. Remove the small tube that runs from the inducer to a black or silver disk, blow out and draw in air until you hear clicking noises. Sometimes they can become stuck. If that doesn't work, remove the other end of the tube from the pressure switch and blow through it. Sometimes debris can clog the entrance to the pressure switch as well. Hopefully this will solve your problem. You can have a bad limit or a bad pressure switch. In this case you will probably have to call someone out.

Apr 08, 2009 | Goodman Air Conditioners

1 Answer

My unit is a heat pump that cools and heats.

if it is under warranty you could call the manufacture and put in a complaint. get the model and serial number and go online to get phone number. Let the manufacture know your not happy and to send somebody that can fix it. It sounds like you might have an intermintent problem meaning sometimes it can hard to diagnose. Be patient it will be fixed. there are alot of things it could be, so I can't tell you how to fix it unless I was to look at it myself. good luck

Jan 31, 2009 | Amana PBE12 Wall/Window Air Conditioner

2 Answers

Air Conditioner malfunction

Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

Sep 23, 2007 | Air Conditioners

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