1. Carrier Comfort Zone Ii

Zone 3 display at t stat; if set for 64 degrees display will read 64 deg as space temp regardless of actually zone temp. If raise zone temp up zone will react but display will still read 64 zone temp. If lower temp to 63 etc, zone will react accordingly and stat display will show 63 etc. I have switched zone sensor with know good one and still have same condition????? Zone 3 display at t stat; if set for 64 degrees display will read 64 deg as space temp regardless of actually zone temp. If raise zone temp up zone will react but display will still read 64 zone temp.

Carrier Comfort Zone Ii

If lower temp to 63 etc, zone will react accordingly and stat display will show 63 etc. I have switched zone sensor with know good one and still have same condition????? Hi Demetrio Furnaces turn on and off based on what they're told by your thermostat. The thermostat, in turn, will control the furnace based on:. The temperature AT the thermostat.

What the internal heat sensor thinks the temperature of the air is. So, if your idea of 68 degrees is what the thermostat thinks is 71 degrees (thermostat reads three degrees high), then when the air by the thermostat gets to about 65 degrees (by your account), it'll think it's 68 degrees and shut the furnace off. Also, if the thermostat is, say, near a source of local heat, like a lamp, a big piece of electronics, a fireplace, or that place that you habitually set down your coffee, then the air right next to the thermostat may be warmer than the rest of the room, and fool it into thinking it's at it's target. The sensor is usually inside the housing for the thermostat. If it hasn't been dusted in a while, then it can be hard for air to get inside to affect the sensor, though this would generally cause it to lag on readouts and run the temperature higher than you wanted. If you have a digital readout, and the system is saying, hey, target is 68, and the readout gets to 66 and the system cuts off the furnace.

My only other guess is that the unit may have features that are trying to prevent overshoot - i.e. By the time the temp at the thermostat actually gets to 68, most of the room is more like 73. That'd depend on your particular thermostat. At that point, you may want to call customer service with the manufacturer and tell them the issue. There may be ways to adjust the unit to get behavior closer to what you seek. DH Jan 25, 2016. Since it's within 2 degrees of your setting it could be one of two things.

Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off. If the temps are both the same, the furnace thermostat is fine. If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

Feb 09, 2011.

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