Electric furnace runs but won't shut off on heat setting
I have a Kenmore (Goodman) heat pump unit 7 years old. Approx. 2 years ago Sears changed some sequensors and I have had problems since. First of all they cut plugs off original wire harnesses, why I do not know. But now on heat mode when thermostat set at certain room temperature furnace will run and keep rinning forever after reaching set temperature unless I set thermostat down 2 or 3 detgrees manually. Also while running to reach set temperature it will sometimes drop 4 or 5 degrees befor reaching set themostat temp. Sears has looke at, but since they created this problem seem to be lost in reolving it. What is causing this problem?
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Re: Electric furnace runs but won't shut off on heat...
I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.
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I would guess that the fan off setting on your limit is set a little to high. If you have the manual you can see what it says about changing the running time for the fan after the burner has shut off look on the control board and you should see two switches,one to set the time for burners to fire before main blower starts and one to set time for fan to run after burners shut off. To help with the problem you are describing set fan run time up so fan wii run longer. Hope this helps. Thaks.
That does not sound normal at all, I have a Goodman Heatpump and the Fan on the Evaporator (outside unit) should run as soon as it starts up! The only delay you should be seeing is when the unit starts, the fan in the AHU starts 5 seconds after and runs for about 1.5 minutes after shutdown.
Depending on the size of your Electric heat you can use one set of wires because your unit does not run with the heat like the heat pump. The large set of wires going to the electric heat should be used. You may have to jumper a new set to the contactor. On Goodman unit come in L1 and L2 jumper to contactor. Very simple good luck. Rus
Sounds like your repair man ripped you off. He should have stood behind his work.
1. I would try to clean the flame sensor located just below the burners. It is connected to "one" wire (Not the two wire) clean rod with sandpaper.
2. The old and thermostat could have a had a bad heat anticipator. if the new t/stat is not digital the heat anticpator on the T/stat needs to be adjusted. slide the small adjuster arm under the cover to about .6 or .7 and see if the solves the problem. if the t/stat is digital it should be preset from the factory.
3. last resort have a service man check your pressure swith. could be a slow inducer motor, blocked or bad vacum line, or a restricted drain or flue pipe.
There are dip switches on the main board.. When you remove the lower panel on the air handler there are instructions to where the dip switches should be for your units fan control. if the switches are in the correct configuration.. The Thermostat may be malfunctioning or not wired properly. and last.. and most expensive.. the motherboard may also be failing.
heat pumps generate heat from compressing freon and take a while to generate enough heat to be useful. never expect robust heat from a pump like an oil burner or a gas furnace, but they do heat great and are cheaper to operate. do this . if you are still using an old mercury bulb stat change it to a digital one. this will hold an exact temperature and time off between cycles will be less and the indoor coil will stay warm between short cycles, with an old mercurry stat you set it at 70 and it may run up to 73 and stay off till 68. thats a long off cycle and when call resumes the coil has gotten cold and has to start all over again. also dont wait till it gets cold to run a heat pump. turning it on and off as it gets cold is not correct. you should select a temp ,usually 71 for heat and set it and leave it on to do its thing.you may want to check the charge. hot gas discharge is usually 100 degreees hotter than outdoor temps after 15 minutes run time. for example if its 40 outside the big freon line outside thats insulated should be about 140 degrees. or you can run it 15 minutes and grab it with your hand . it should be almost uncomfortable to hold any length of time. careful some get quite hot. you also have the option of hooking up the electric strip to automatically come on if you push the stat up 2 degrees hotter than the temp in the room. that way you get heat pump and strips till temp gets within 2 degrees of set point and the strips shut off and pump maintains.good luck
sounds like the fan switch in the furnace is coming on and off. This is common for Goodman. or could be the heat anticipator on the t-stat. While there are several reasons this happens these are the most common.