I have an OBserver thermostat it says system default do I need to call for service furnace seems to be working ok. Or where can I get a manual

SOURCE: A thermostat versus an AC problem

Hi,

"outside sensor error" is indicative of a Diagnostic error display, a feature where the device checks the functionality of each attached component. It would seem that your system has the optional "Outdoor Temperature Sensor" (probably P/N TSTATXXSEN01-B). The error then indicates that either that sensor is faulty or the hook up cable is unplug or defective. If you do not observed any critical changes in the comfort inside your home or the area that your system monitors/controls, then this only confirms that it is external and a sensor problem and does not affect the A/C and/or the variable speed furnace/comfort zone system. Normal faults could be the external sensor to cable connector/terminals being exposed to the elements and would require hard cleaning.

This sensor is not critical to the operation of the system and is optional.

Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

SOURCE: how do i operate thermostat and furnace

if your furnace is on 24 hours straight, before it heats up your home, then either your cold weather and indoor temps are extreme, or your unit is grossly undersized. if however your furnace cycles on and off when the temp is still way colder than you have set it you have either a bad stat that thinks its hotter than it is, or a bad furnace problem and even though the furnace is getting a signal from the stat to heat it is failing to do so. you'll have to watch and think this through to isolate the problem. if you set the furnace to max heat and it runs and heats the house reasonably quick then its probably going to be a bad stat. if you set it to max heat and it shuts off way before it gets to setpoint then the problem is in the furnace. be sure filters are clean, blower wheel is clean , returns are no obstructed, etc. if you by chance have an old mercury bulb stat they had a thing in them called a heat anticipator which basically worked like this. a dial with a little pointer determined how soon it would be till the furnaced reached the desired temp and anticipated how soon to shut off the burners in anticipation of the cool down period so you dont overshoot the desired temp. if these are bad or moved to different setting they can short cycle the furnace on of on off etc. or shut down the burner almost as soon as it lights. setting is usually at .4 to .6 on most, but really a digital stat is only way to go. by the way check to be sure you don't have a hot air supply grill blowing directly on the stat or it will shut off as soon as stat gets hot and rest of house will be cold. usual location is 5 feet off floor directly over the main return air grill or under it as the case may be. good luck

SOURCE: ruud achiever 90 plus won`t start

Check the data information on the unit there should be a troubleshooting guide that tells you what the two lights blinking once means. hope this helps.good luck. normally found with schematic

SOURCE: Furnace doesn't come on, no matter where thermostat is set

This sounds like the relay switch on the control board may be bad. I just replaced a control board last week on a Carrier unit doing the same thing. The relays are built into the control boards. To fix this you must call a luxaire dealer and they can be found at www.luxaire.com. I will ask though, if you put the tstat into fan on instead of auto, does it come on? If it does, it could be a tstat issue. How you find this out is to remove the thermostat and expose the terminals. Take a small "jumper" wire and touch either one of the r terminals to the w terminal and hold it there. If the unit fires up with no problems, then it's the stat and not the board. Try jumping first and if it still won't come on, you know it's the control board. Good luck to both of you!

Fal Mueller

• 438 Answers
• Posted on Jan 28, 2010

SOURCE: two air conditioners & two furnaces with one thermostat

use relays to combine the to and isolate from each other or observing polarity's, you should be able to parallel the connections from your thermostat