Troubleshooting Common Thermostat Problems Signature/Star Series (Except for P374-0000, 0100, 0200, 0300) 1) Clock losing time 2) Display goes blank or shows “PF” when starting cooling or heating 3) Unit running backwards – cooling on heat demand, heating on cool demand 4) Unit runs both heat and cool at the same time • If your system is a single stage heat pump and uses an O or B wire, you must move the System Selector switch inside the thermostat to the Heat Pump position. When this happens, your outdoor unit will shut off and send a signal to your thermostat, causing it to blink. Indiglo Backlight. Thing is, that signal doesn’t mean your indoor unit is made aware of the problem. I've drawn lines indicating how the old wiring corresponds to the way I've connected them on the new one. Up to 2 other sensors can be used in conjunction with the thermostat. Your indoor unit will probably continue running, and the thermostat will keep blinking until the problem is fixed. CTC thermostats feature attractive styling, overheat protection and static protection. A flashing 3 means the third setting is currently operating the heater or AC. I tried replacing my old thermostat with an RTH7600D, and have it set to "cool" - but it seems to be blowing out hot air. 2 AA batteries included. 5 The thermostat will flash 1,2,3 or 4 depending on its time and temp setting. This past winter caused a record cold snap in the US and other parts of the world in December. According to the National Oceanic and Atmospheric Administration, 2017 was the second-hottest year on record for the US; only 2012 and 2016 were hotter.Clearly, temperature control is going to be a bigger deal for most households, and they’ll be looking at their thermostats a lot more. To configure your thermostat to work with the remote sensors: This thermostat comes with one sensor that allows for temperature reading or control in an alternate location, away from the thermostat. Even when a thermostat is controlled wirelessly by a smartphone, has sophisticated programming to automatically shut on and off, or is controlled wirelessly by a smartphone, the principles are still the same: Low-voltage wires inside the thermostat send control signals to the furnace through small-gauge wires when the thermostat's inner mechanism senses the room temperature has … gas, electric or oil systems, millivolt systems, 2 wire hydronic systems (Not for use with 110/220V systems). INDIGLO ® night-light: Backlights ... thermostat. Most alarms and alerts require a qualified service technician to diagnose. Easy, front load battery access. However, there are some problem you may be able to resolve yourself. 43054. If the screen is completely blank and you can't get it to work again by replacing the batteries, then your programmable thermostat has just become an overpriced doorstop. While complete failure is rare, it can happen. cleared except for “BATT” flashing on the LCD display. If your thermostat has one wire marked R or RH (4-wire system), then leave the jumper wire between the RH and RC terminals on the wallplate. Below is the diagram: The image on the left is my old thermostat - on the right is the RTH7600D. Figure 4 Figure 5 • Refer to the Wiring Diagrams below to be sure your system is wired correctly. What to Do: 43054--WALL THERMOSTAT. THERMOSTAT FLASHING – Some York heat pumps and air conditioners utilize a computerized equipment monitoring system which will flash a “diagnostic” light at the thermostat to indicate a problem or system malfunction. lharwell8588 posted an answer 11 years, 9 months ago. Press the Was this answer helpful? is for sensor 1, for sensor 2, and is for the outdoor sensor. Are compatible with: 24 VAC heat/cool, Heat only or cool only systems. For Conventional Systems and Single Stage Heat Pumps. Yes No. Will flash 1,2,3 or 4 depending on its time and temp setting Wiring corresponds to the Diagrams! 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