Honeywell CHRONOTHERM IV T8665A Troubleshooting Manual
- User manual (48 pages)
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TROUBLESHOOTING
| Symptom | Possible Cause | Action |
Display does not come on. | Thermostat is not being powered. |
|
Temperature setting does not change(Example: cannot set the heating higher or the cooling lower). | The upper or lower temperature limits were reached. | Check that the temperature setpoints are: Heating: 40 to 90°F (4 to 32°C) Cooling: 55 to 99°F (13 to 37°C). |
Heating does not come on. | System selection is not set to Heat. Heating setpoint is below room temperature. | Check that setpoint is above room temperature. Check if the circuit breaker is tripped — reset the circuit breaker. Check if the fuse at your fuse box is blown —replace the fuse. Check if the System switch at the equipment is in the Off position — set to the On position. Wait five minutes for the system to respond (thermostat displays " Wait"). Set System selection to Heat. |
"Filter" flashes in display. | Indicates a Filter Timer has expired. | Display or Reset Filter Timer Settings → reset timer. |
Cooling does not come on. | System selection is not set to Cool. Cooling setpoint is above room temperature. | Check that setpoint is below room temperature. Check if the circuit breaker is tripped — reset the circuit breaker. Check if the fuse at the fuse box is blown — replace the fuse. Check if the System switch at the equipment is in the Off position — set to the On position. Wait five minutes for the system to respond (thermostat displays " Wait"). Set System selection to Cool. |
No warm or cool air is coming from the registersSystem on indicator — for heat,  for cool — is lit, but no warm or cool air is coming from the registers. | Heating/cooling equipment turns on the fan when the equipment has reached the preset time or temperature. | Wait a minute after seeing the  or  and then check the registers. If there is no hot or cool air coming from registers, refer to Heating does not come on or Cooling does not come on. |
Heat or cool turns on before programmed time. | Adaptive Intelligent Recovery™ control is on. | Adaptive Intelligent Recovery™ control brings the heat or cool on early to meet the temperature set for the programmed period. To disable Adaptive Intelligent Recovery™ control, contact your local Heating and Air Conditioning contractor. |
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