Brand: COMFORT STAT
Category: Thermostat
Manual Type:
Language:
Manual for CP1717 - Troubleshooting and error codes + PDF Download
Uploaded: April 8, 2025, 3:07 a.m.
Warranty Summary
None
Start-up: The LCD shows the default temperature after a few seconds of installing batteries.
System Selector Switch: Select COOL, OFF, or HEAT using the switch.
Fan Switch: Set to AUTO for normal operation or ON for continuous fan operation.
Review/Set Temperature: Press up/down keys to view and adjust the set temperature.
Filter Monitor: Indicates when the filter needs checking after 400 hours of system run time.
SPAN Setting: Adjust the temperature cycle range for comfort.
Troubleshooting and error codes
| Problem | Solution |
|---|---|
| No Display | 1. Check battery connections and batteries. 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. |
| Heating or Cooling Does Not Go On or Off. | 1. Check that the function switch is in the correct position ("HEAT" or "COOL"). 2. There may be as much as 4-mintue 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 non-heat 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. 8. If you have single-stage 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. |
Troubleshooting and error codes
| Problem | Solution |
|---|---|
| No Display | 1. Check battery connections and batteries. 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. |
| Heating or Cooling Does Not Go On or Off. | 1. Check that the function switch is in the correct position ("HEAT" or "COOL"). 2. There may be as much as 4-mintue 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 non-heat 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. 8. If you have single-stage 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. |