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I can't get my thermostat togo up or down temp. It is stuck on 65 degrees.

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Sounds like it's locked or in the wrong mode.

First check that you're in cooling (or heating) mode, and not just fan.

Without the model or maker I can be general in saying that you may have a small lock switch on the t-stat... or there's a setup/settings option to lock the temp so that others don't keep moving it up and down.

If you don't have the user guide, the manufacturer's website should have the guide available, or even have a Q&A or FAQ page that will tell you how to lock/unlock the temperature adjustment.

Also, make sure the batteries are good if it's powered thusly. Try a fresh battery to check if that's the case. If it's direct-wired then that won't matter.

A more extreme tactic would be to turn off the power to the whole unit for 5-10 minutes... There should be a disconnect nearby the outside unit with a handle to cut the power.. or a box with a breaker inside. If that's not outside then you should have one in your main breaker box inside.

Good luck!!

:o)

Posted on Jan 04, 2011

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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.

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http://www.advantageengineering.com/fyi/289/pdf/advantageFYI289.pdf

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I just installed a honeywell 5-2 progammable thermostate.. Everything is hooked up fine and I have my days, hours wake, sleep, leave...etc all set, but when it goes on.. for example, I have it set for...


You didn't include a model number, so it's hard to know for sure - but I'll take a stab at this one. Many of these t-stats have a programmable offset to reduce "hunting". This can be as little as 1 degree or more than 2 degrees.

This means if you set the offset to 1 degree and the room temperature to about 65 degrees, the furnace will heat the room until the t-stat registers a rising temperature of 66 degrees. The furnace shuts off and will not turn on again until the t-stat registers a falling temperature of 64 degrees. The average is 65 degrees, and prevents the furnace from starting and stopping numerous times instead of just once with the 1 degree offset.

You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

Room Temp Furnace
63 On
64 On
65 On
66 On
67 On
68 Off

The room is now warm and heat or furnace is off. The room begins to cool like below:

67 Off
66 Off
65 Off
64 Off
63 Off
62 On

With a 1 degree offset, the room temperature varies +/-1 degree (about 2 degrees total). With a 2 degree offset, the temperature about varies +/ -2 degrees (about 4 degrees total).

Also, when the thermostat shut the heat off, the heat that was made is delivered to the space instead of wasted by sending outdoors - so the room will get a little warmer even though no fuel is being burned. The same holds true at the other end. When the t-stat turn heat on, fuel is burned, but there's little heat until the source has reached the optimum temperature and then the heat is delivered to the space.

I hope this helps & good luck! Pleas rate my reply - thanks!

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I would investigate the thermostat first. It sounds like the most likely place to start based on the symtom

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I have a Honeywell programmable Thermostat (an expensive one that handles humidity, etc) and every spring and fall the thermostats behave improperly by ignoring the programmed temperature and cooling the...


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Don't know of anyway the filter could cause this. If the filter was bad (clogged), it would cause a rise in temp of the air while in the heat mode but the system should still cut off when the set temp (65) was reached.
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