55 SPECIFICATIONS
55.1 T5 Smart Thermostat without C-wire Adapter
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56.1 Related Manuals
Why is my Heating not Working?
Your primary heating (1
st
stage) is controlled by the W terminal on your thermostat. (Or the Y and O/B terminal if you
have a heat pump system)
Confirm the thermostat is set to Heat mode and the setpoint (the smaller number at the top of the thermostat display),
is set to a temperature higher than the display temp (the larger number in the center of the display).
Confirm the message “Heat On” is solid (not blinking) on the thermostat display.
Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires)
Check your jumper selector switch. To operate heating, the thermostat requires power to the R terminal. (If you have
a wire in the RC terminal and no wire in the R terminal, move the RC wire to the R terminal and move the jumper
selector switch up to the “1 Wire” position)
Advanced steps:
Using a multimeter, measure the AC voltage between your R wire and your W wire (between Rc and Y for heatpump
systems). Your thermostat operates between 20-30VAC, any reading outside this range should be addressed by a
Professional Contractor.
Why is my thermostat set to Heating, but I feel Cool or Mild Air and not heat? (Or Why is my
thermostat set to Cooling but I feel Heat or Mild air and not cooling?)
Check your jumper selector switch. If you have a wire in the RC terminal and no wire in the R terminal, move the RC
wire to the R terminal and move the jumper selector switch up to the “1 Wire” position. If you have a wire in the R
terminal and a wire in the Rc terminal, the jumper selector switch must be in the “2 Wire” position.
Check your wiring. If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or
Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems. O/B and Y control your first stage
heating for heat pump systems. Backup heat sources must be connected to the W2, Aux, or E terminal for proper
functionality.)
Check your configuration. Most commonly, O/B is energized in Cooling (O on cool). For Rheem or Ruud brand heat
pumps, the O/B must energize on heating (B on Heat).
Why won’t my thermostat screen power up?
The thermostat operates between 20-30 VAC, “supplied” to the R/RC terminals and “returning” through the C
terminal. A C wire, connected to C on the equipment, is required for the thermostat to power itself.
Verify the furnace / air handler door is closed, the power switch is on, and the breakers are on.
Confirm you have a C wire in the C terminal. If your previous thermostat did not use a C wire, it’s unlikely that it is
connected at the equipment. Verify the C wire is connected to the C terminal in your furnace or air handler.
Check your jumper selector switch. If you have a wire in the R terminal and no wire in the RC terminal, verify the
jumper selector switch is up in the “1 Wire” position. If you have a wire in the R terminal and a wire in the Rc terminal,
the jumper selector switch must be in the “2 Wire” position.
Advanced steps:
Using a multimeter, measure the AC voltage between your R/ RC wire and your C wire. Your thermostat operates
between 20-30VAC, any reading outside this range should be addressed by a Professional Contractor.
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