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When unit is put on max heat it shuts off at 70 degrees

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Posted on Jan 02, 2017

  • 351 Answers

SOURCE: unit shuts of at 70 degrees F. Setpoint of the

need to replace thermostat

Posted on Sep 29, 2010

  • 77 Answers

SOURCE: I have a Lennox model CB19-51-1P air handling unit

first thing you need to check is if the reversing valve is working you maybe running your A/C with the heat strips on depends on the t-stat your using some heat pumps will bring the strips on with a high degree difference in setting and room temp .

1- turn t-stat to heat set temp 10 degrees above room temp if you have a programable t-stat it will have a time delay on it allow to for the outdoor unit to come on 2 to 5 minute usually .
2- walk around to the outdoor unit when it comes on feel the big line the insulated one and see if it is hot or cold let it run for a 5 minutes peel back the insulation and gently grab the line with your hand it maybe real hot so be careful if this line is hot then your heat pumps is working mechanically and if it is just warm then you may need the charge topped off

there are so many different option's from this point i will need to know the findings of this test first thanks : Michael

Posted on Nov 16, 2010

Testimonial: "Very detailed reply with enough information to easily diagnose problem."

  • 192 Answers

SOURCE: I live in an apartment

It is possible if your furnace has a pilot light. All newer furnace do not have pilot lights, they use a hot surface ignitor ( which could be bad ). It`s hard to say without more details about the furnace and what it is doing.

Posted on Feb 03, 2011

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1 Answer

The unit is on Heat, Fan Auto it's 36 degrees outside, Thermostate set on 73 Actual temp inside 70. Unit runs continuously. How can I get more heat. I tried Emergency heat and that doesn't help.


Have you cleaned the air return filters ? Wash them, don't vacuum or brush them. It damages the filter screen. Sometimes a thermostat will be out by a few degrees. If the filters are clean, try turning the temp down a bit to 65 degrees and see if the air con shuts down. ( If your room temp is showing 70, it should switch off the machine) If it doesn't turn off, keep reducing the temp by 5 degrees at a time and wait a few minutes each movement to see if and when it shuts down. If the machine keeps running, I would suggest your thermostat is shot and you will need a new one.

Jan 04, 2016 | Heating & Cooling

1 Answer

Hi,My remote do not get the good temp in my house. Ex: I set to 80F in heat mode but the thermopump operate slowly and dosn't get hire than 70-72F. The remote see the unit and all. Is the sensor in th


You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.

Nov 30, 2014 | Heating & Cooling

1 Answer

What causes this heating element to break so quickly


when heating water under 70 degrees if condenses and rains on ignitor

Sep 10, 2013 | Sta Rite SR400NA Max E Therm Pool Spa...

1 Answer

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.
SeagullAC

Sep 15, 2011 | Heating & Cooling

1 Answer

I have a Lennox model CB19-51-1P air handling unit with HP19-511-1P compressor heat pump unit. I just turned the heat on for the first time this season. And I am getting low heat volume. The heat pump...


first thing you need to check is if the reversing valve is working you maybe running your A/C with the heat strips on depends on the t-stat your using some heat pumps will bring the strips on with a high degree difference in setting and room temp .

1- turn t-stat to heat set temp 10 degrees above room temp if you have a programable t-stat it will have a time delay on it allow to for the outdoor unit to come on 2 to 5 minute usually .
2- walk around to the outdoor unit when it comes on feel the big line the insulated one and see if it is hot or cold let it run for a 5 minutes peel back the insulation and gently grab the line with your hand it maybe real hot so be careful if this line is hot then your heat pumps is working mechanically and if it is just warm then you may need the charge topped off

there are so many different option's from this point i will need to know the findings of this test first thanks : Michael

Nov 16, 2010 | Heating & Cooling

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

I set temp to 74 and stop at 70 and decresing.


The only thing I can think of other than being just old and worn out is that by design it may not be set to run but so much at a time. Has this always done this since you have had it? It may be needing calibration. One thing you can try is to set it at 2 degrees higher than you want it and then it would shut off at the temp you actually want.

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2 Answers

Heat pump works in emergency heat, but not in auxiliary heat


I set the thermostat for 70 degrees. It comes on always in auxillary heat and does not shut off when it reaches 70 degrees. It is a heat pump, I am assuming, it might be the thermostat? But when the air conditioner is on, it turns off when it reaches it's temperature.

Jan 20, 2009 | Amana PTH123B25AJ Heat Pump Air...

1 Answer

Can Movincool classic plus 26 AC set the air temperature at below 70 degree F?


aircons normally pull down to approx. 17 degree celcius.and heats to approx 30 degree celcius.  most of the time you need to simply clean the condenser properly and to make sure fans are in good order.

Oct 16, 2007 | Movincool Classic Plus 26 Air Conditioner

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