My house thermostat was set by the previous house owners on a timer and now when I actually need warmth and try to turn it up it stays on 70 for about 5 minutes and then resets down to its timed setting. Is there a way to reset it permanently?
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AC means "air conditioning." If the AC icon is showing on your thermostat it means that your air conditioning is activated and should come on when the temperature threshold you've set on the thermostat is reached.
For example, if you've set the temperature level to 78 degrees, when the house temperature goes above 78, usually by about two degrees, the air conditioner should cycle on to cool it back down to 78 degrees at which point it will then turn off.
This information should be in your air conditioning/heating system or thermostat owners manual. If you don't have the manual, you should contact your air conditioning dealer or your builder to secure a replacement. The manual is essential for proper operation and maintenance of your system.
The problem is likely with the cooling system, not the thermostat itself. Either the message from the thermostat is not being received by the AC unit, the solenoid isn't turning on the unit or it can't cool properly. First check that none of the wires to the thermostat are loose or broken. You'll have to take the face plate off to check. The conductors are very small wires and can break easily. Depending on the unit,there are 4-5 wires usually for a HVAC system. If a wire is loose, reconnect it (push it in or screw it down gently). If a wire is broken, strip (for screw terminals) a new section and reconnect it. Check for ice build up on the condenser coils. (That is often a sign of a refrigerant leak. You'll need a professional to fix it and recharge the unit.) Do you hear the fan running? If you do, then the condenser is a likely culprit. If the fan isn't running, then the control board for the system may be bad. You may want a professional to check the system. If you tell them the make and model, the technician can bring the parts if it is a problem with the control board.
I hope this helps.
Cindy Wells (We had the broken wires to our thermostat in the winter. A few years ago, a nearby lightning strike had the AC off in the summer due to the control board damage. The house reached 90 degrees while we waited for the repair.)
you should hear the themostat make a light click when it calls for heat...the hold or as you said temporary hold overides any programming you have and should maintain that temperature you are setting it on indefinetely of until the next programmed cycle... to check and make sure the unit is actually working properly try it again ... actually go after you hold the setting and see if unit is working...digital thermostat have a five minute time delay built in so from the time you press hold and raise the temperature above house temp a few degrees start a counter for 5 mins... if the unit does not come on then unplug the unit or reset breakers to heat and try again watching the unit to see if anything happens...is this a gas unit or electric unit? if the unit never responds then go to thermostat and remove cover take a small jumper wire and jump out the "r" terminal and the "w"terminal which is power and heat circuit see if it comes on if it does and should immediately as this way bypasses the thermostat operation then you have a faulty t-stat.
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.
if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times
if you set the thermostat on 70 and your house won't get ant cooler than 72, there is a problem with your system,not your stat. I'm thinking you are low on refrigerant if it is somewhat working. when the unit is running, if you can get your hand on the larger refrigerant line under the black insulation, it should be cold, about 55 degrees.