Comfort Stat CP1717, Owner'S Manual, Page: 7 / 8

The factory position for this switch is in the STD position. Leave it in this position if you have ANY system that uses gas, oil, electric, or hot water heating. If you have a
single­stage Heat Pump (no auxiliary or emergency heat source), then slide the switch to the HP position. Be sure the reversing valve wire is connected to the correct
terminal for your heat pump (Rc/O) or (Rh/B).
Ÿ
F˚ / C˚ selector (Fahrenheit / Celsius)
Your thermostat is set for F˚ mode from the factory. In order to change to C˚ mode, slide the switch to C˚ and hold any key about 2 seconds without the battery, then
place the battery again .
NOTE: Unless press any key about 2 seconds without the battery, then place the battery again.
Figure 6
TROUBLESHOOTING
Problem Solution
1. Check battery connections and batteries. No Display
2. Move the battery out and wait for about 1
minutes then Replace Batteries. .
Entire Display
Dims.
1. Replace Batteries.
Auto Fan Does Not
Turn On Properly.
1. Move HG/HE selector to correct position.
1. Check that the function switch is in the correct
position (“HEAT” or “COOL”).
2. There may be as much as 4­mintue delay
before the system turns On – wait and check.
(Compressor protection delay.)
3. Check your circuit breakers and switches to
ensure there is power to the system.
4. Replace batteries.
5. Make sure your furnace blower door is closed
properly.
6. If your non­heat pump system only uses 4­
wires, be sure the jumper wire is installed
between the Rh/B and Rc/O terminals.
7. Check the position of the Reversing Valve
selector switch: Standard or Heat Pump.
Heating or Cooling
Does Not Go On or
Off.
8. If you have single­stage heat pump, be sure
the jumper wire is installed between the Y and
W terminals.
Erratic Display 1. Move the battery out hold any key then place
the battery again. Then reprogram.
If unit continues to
operate in the Off
position.
1. Replace unit.
Thermostat
permanently reads
“HI”, “LO”, or “Er”.
1. Replace unit.
1
2
3
4
Te mp era tur e
Di spla y
S ystem
S e lecto r
S TD HP
F an Op tion
HG
HE
K3
JP 2
FA HRE NHE IT CE NTIG RA DE
K5