I have the temp set at 70 on hold and it will not go above 67
SOURCE: Won't shut off when reaching preset temp
Sounds like a thermostat problem or a short in the wire. Can you give us more info like is it gas or electric and model numbers will help. Thanks.
SOURCE: Furnace doesn't reach desired temperature
One of two things you can try. Do you own a volt ohm meter? Anytime your unit cycles short like it is doing the control circuit which on this one is 24 volts that engages relays and controls the gas valve to open and close. I am thinking the heat exchanger is getting so hot it is tripping the upper limit which for the most part is around 180 degrees. So next time it turns off take your ohm meter and with the power to the whole unit off. Either turn the breaker off or there is a light switch that is real close to unit turn it off. Undo the two wires to the gas valve and ohm them out. You should have continuity if you get nothing check each limit switch should have a couple. Undo wires to them and check. If you find one that is open more then likely the upper one. They are a safety device that keeps the unit from getting too hot.
There might be another option increase the speed of your fan motor to get the heat out of furnace quicker. Look at the circuit board notice the fan wiring going to it. The Red wire from fan is low speed look to see if it is on HEAT on the board. You should have 4 speeds to pick from you could take the black off of COOL and swap wires and test the unit by doing that. I'm going to put a solution on this so I can come back to it quicker. Even though we a just testing it for now. ken
SOURCE: 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.
SOURCE: cooling temperature will not below 70
controllers more than likely on a memory lockout... kill the power and take the batteries out of it... leave it for 60 seconds and try again... unfortunately you are probably going to have to replace the controller, sorry
SOURCE: Honeywell RTH2310 thermostat temp variance
Hi,
Yes you can change that by change the number of cycles per hour that your t-stat looks from for youe furnace. Lower the cycles per hour number and it will increase the range.
You can see how to do it here
http://dl.owneriq.net/3/39359643-dfda-451d-bb81-828eecddd9fc.pdf
I hope that this will help you to solve your problem!
Thanks for using Fixya!!
Heatman101
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