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Edgestar 12000 heating problem

Dear Guru:

After I set the heating thermostat set point ("ST" on the unit) (say 75 degrees), my heater will run if the room temp ("RT" on the unit) is lower than 75 degrees. However, after the heater runs and reaches 75 degrees, the "RT" will stay at a temp higher than 75, sometimes in the 80 to 83 range. In turn, the heater will not come back on because it thinks the room temp is higher than 75. I know the room temp is not higher than 75 because I have a separate thermometer in the room to measure the room temp.

Thank you.

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Re: Edgestar 12000 heating problem

Bad thermostat. the stat can be as must as 5 degrees off. try, if possible testing the unit in a differeent location

Posted on Dec 29, 2007

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Outside unit runs for about 5 seconds then shuts off for a few seconds. It repeats this cycle.

Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

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It sounds like your heating system has to little capacity to heat the home properly. 21 degrees is a reasonable temperature to expect but if the unit is running all the time and can't reach 21 degrees the heater is too small.
As far as setting the thermostat here is a link to the instructions.

Nov 22, 2013 | Air Conditioners

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We have a new a/c and the system has heat strips. For a/c. we have had the thermostat set on AC at 72degrees. Now that it is getting colder and may need some heat in the house, do we switch the...

If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.

Sep 15, 2011 | Air Conditioners

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How do I set the heat at 75 with no fan mode. I don't want the fan to come on once the room reaches 75

Hi, there is no way that this can be done. The fan is controlled by several different parts for the furnace to run properly. If you are saying that the fan continues to run after it reaches its set point, this is normal if it only runs for about a minute and 1/2. This is to cool down the heat exchanger. If it continues to run all the time after reaching its 75 degree set-point, you have a fan relay that is sticking internally, or a high limit switch that has failed and depending on how old the unit is, it may be what is called a combination fan/limit control that has dirty or burned contacts which will keep the fan on. What I am trying to say, is when your unit reaches the temperature you want, the fan should only run a short time as the limit controls are there to shut it down from a setting on the fan control that is preset by the factory. If you can give me more information on your unit such as model, serial, name of unit, and if it is a gas fired central heat and air unit, or heat only, a heat-pump ect. would be of a big help to determine what controls you have on this unit that is keeping the fan on. Leave this info in the comment thread for my user name, and I will get back to you.
A/C, Heating, & Commercial Refrigeration Contractor

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1 Answer

I have my thermostat set to 75 degrees however my house will only get up to 70 degrees. At night when the temp drops outside so does the temp in my house. For example I had my thermostat set for 75 degrees...

How old is your system?

If your system is a heat pump and is failing to keep up overnight during the colder weather. Or if it struggles to keep up at all, a few issues come to mind.

Obviously, the first and most common cause would be due to an undercharge of refrigerant. With an undercharge, your heat pump has lost efficiency and cannot properly remove heat from outside.

Other possible issues that come to mind are failed defrost cycle. If your unit is not defrosting properly and it continues to run non-stop, a freeze-up could occur on the outdoor coil. And the worse it gets, the worse your system will perform.

Another possibility is auxiliary heat or heat strips are not coming on at all. Depending on your thermostat, you would be able to tell if the thermostat is calling for auxiliary heat. If you are not getting any additional heat, then the heat pump may not be adequate for the space intended.

Other smaller factors may come into play such as incorrect defrost cycles. Possibly a mechanical component taking a break or overheating or maybe a mechanical failure such as failed compressor leaving the only heat you have as emergency.

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There are 3 possibilities beginning with the most likely problem

1) If your heater heats up for a few minutes and then quits, chances are there is a blockage in the air flow, check for dust and grime blocking the air intake coarse filter , airgun blow to clear accumulated dust and otherwise clean the coarse filter .
2) If the heater fan blows but there is no warm air, the heating element needs renewal ( this happens very rarely)
3)If the fan stalls and the heater heats up and the thermostat kicks in, then this will be not be a DIY job. This is least likely as you said the air cooler works.

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