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Thermostat does not stop heat pump unit

My programmable thermostat is set at 65, the room temp reads 68 but the thermostat does not turn the heat pump off and the unit still runs. If I lower the temp setting way down to 60, the unit will stop only to come on again several minutes later.

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Re: thermostat does not stop heat pump unit

Most of these problems are the program settings on these way overcomplicated thermostats. You will need to re-read the instructions on setting the programs. Or bite the bullet and buy a cheaper and simpler one. If you installed it yourself, make sure the settings on the inside are correct, like gas/electric heat, and 24 volts, stuff like that.

Posted on Mar 14, 2008

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Look for a stuck relay that controls the pump

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Trying to set temp on honeywell t-stat

I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)

Dec 09, 2013 | Honeywell Programmable Thermostat Heater

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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!

Jan 24, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

My programmable thermostat current temp reading is 65 but my temp is set to 68. I noticed it yesterday also (read 66), and this is not normally the case. The "current temp" setting is normally...

What type of system do you have, Heat pumps have an AUX setting if that not comming on depending on where you live it may not keep up on its own. A gas furnace should give no trobble check you normal stuff like the filter and it is not on a program and changing over around the time you check it.

Dec 30, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Temp set at 68 degrees but goes to 66 and the heat pump never shuts down has an electric aux

Depending on the outside temp. your heat pump might not keep up with the demand. It is not economical to run your heat pump in temperatures at or below freezing. Doing so could cause compressor failure and these are not cheap to replace. I would be running the aux. electric in low temps.

Dec 21, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Turned the programable thermostat down to 65 degrees but it is still 75 degress in here...someone said something about a filter??? HElp!

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.
Some of these t'stat's are programmable for 7 individual days. You may have to set the temps you want and then "Copy" them to the other 6 days. Read your instructions that came with it or, sometimes there are some brief instructions on the inside of the cover, if it has one.

Feb 28, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Heater running continuously

Sounds like you have a problem with your heat pump. Your aux heat is a electric coil. how old is the unit when was the last time it was serviced? How cold is it out side?

Jan 15, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Cannot set heat setting by using "hold" feature

make sure it is not telling you room temp, some of the Honeywells, will display room temp over desired temp. check that, if it wont let you switch temp than buy a new one, if you dont have a heat pump a new cheap stat is around 20.00.

Dec 31, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Thermostat displays 79 deg but really 68 in room

If the thermostat does not have a reset, replace it.

Nov 05, 2008 | Honeywell Programmable Thermostat Heater

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