American thermostats Robertshaw are an excellent option for your home arrangement. The troubleshooting system presented in form of a table below will allow to reveal any malfunction in time and effectively remove it.
| SYMPTOM | REMEDY |
|---|---|
| Thermostat does not turn on system. | Check wiring. Check fuse. Replace with 3 amp fuse if fuse has opened. |
| Thermostat turns on and off too frequently. | Increase temperature differential. |
| Display is blank, flashing or constant LO BAT. | Replace batteries. |
| System fan does not operate properly. | Move fan option switch to either gas or electric, to match system. |
| Time shown on display is not the current time of day. | Change time of day setting. |
| Thermostat does not follow program. | Thermostat in MANUAL mode. Thermostat may not have been programmed in HEAT or COOL position. Verify program. Check AM/PM indicators at time of day and programmed time changes. Verify program and day of week is correct |
| Thermostat does not advance day of week. | To view or change day of week |
| PROBLEM | POSSIBLE CAUSE | SOLUTION |
|---|---|---|
| No heat/cooling in house | Zone thermostat(s) | Select heat, cool or auto mode of operation at thermostat |
| Faulty thermostat | ||
| Faulty zone control panel | Follow instructions outlined in Setup and Test. Replace if necessary. | |
| No heat/cooling in zone | Balancing damper closed | Check all balancing dampers in the same duct as the motorized zone damper; closed balancing dampers should be readjusted. |
| Zone registers closed | Check all zone registers: closed registers should be readjusted. | |
| Faulty thermostat |
| Problem | Action |
|---|---|
| Thermostat does not turn on system. | Check wiring |
| System turns on too often. | Increase temperature differential |
| System fan does not operate properly. | Move fan option switch to either gas or electric, to match system |
| Thermostat does not display proper room temperature. | Check F/C (Fahrenheit/Celsius) setting. |
| Display Shows HI or LO and room tem- perature is normal. | Call a licensed service person to replace/repair. |
| Problem | Solution |
|---|---|
| No display | 1. Check batteries connections and batteries. 2. Remove the batteries and wait for about 1 minute, 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 muchi as a 4-minute delay before 1he 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 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. Remove the batteries, hold any key then replace the batteries. Reprogram. |
| Unit continues to operate in the OFF position | 1. Replace unit. |
| Thermostat permanently reads HI, LO, or Er | 1. Replace unit. |
| Symptom | Remedy |
|---|---|
| Thermostat does not turn on system. | Check wiring. |
| Check to see if "OFF" is indicated in display. Select HEAT or COOL mode by pressing SYSTEM button. | |
| Heat turns on instead of cool and vice versa. | Check wiring and system specifications. |
| Thermostat turns on and off too much. | Increase temperature differential setting. |
| Display is indicating "LO BATT." | Replace batteries soon. Be sure battery installation is correct. |
| Thermostat beeps once per minute and "LO BATT" is indicated in display. | Batteries low. Change batteries immediately. |
| LCD display is blank. | Replace batteries to control system. |
| Thermostat beeps and does not allow temperature changes when v or a buttons are pressed. | Autochangeover "deadband" conflict or thermostat is locked. |
| Thermostat does not follow program. | Check AM/PM indicators at time of day and programmed time changes. |
| Thermostat may be in "Early Recovery" mode. Check dip switch settings. | |
| Thermostat may be OFF. Select HEAT or COOL mode by pressing SYSTEM button. | |
| Program may not have been done in HEAT or COOL modes. | |
| Both HEAT and COOL programs utilize the same setpoint time and programmable fan settings. Only setpoint temperatures can be different. | |
| Check compatibility guide and system specifications. | |
| Thermostat in MANUAL mode. | |
| Thermostat may not have been programmed in HEAT or COOL position. Verify program | |
| System runs too long. | Temperature differential may be set too high. Decrease temperature differential to lower setting, |
| System will not enter AUTO (Auto Changeover) mode. | Thermostat must be in PROGRAM mode to run AUTO system operation. Press PROG/MAN button until PROGRAM is indicated in display. Then, press SYSTEM button until AUTO is indicated in display. |
| Room temperature reading is inaccurate. | If you have attached remote sensors, the thermostat will display the average temperature of the activated sensors. |
| If there are no remote sensors attached, make sure that the remote sensor dip switch settings on the rear of the thermostat body are turned off and the MAIN thermostat dip switch is turned on. | |
| Thermostat will not let me change setpoint temperature above or below a certain point. | AUTO (changeover) mode may be active. See OPERATION - Selecting Auto Changeover. AUTO will be indicated in display. |
| Thermostat turns on system before my programmed setpoint time. | Early recovery mode is in effect. This optional feature turns on the system prior to the next setpoint time to reach the temperature you have programmed. If you wish to change your thermostat to normal recovery, |
| Thermostat turns off system before my programmed setpoint time. | Early recovery mode is in effect. This optional feature maximizes comfort for occupied periods and eliminates energy wasting demand cycling prior to set-back periods. If you wish to change your thermostat to normal recovery |
| Thermostat does not automatically switch from HEAT to COOL mode of operation. | Verify that thermostat is in PROGRAM mode and AUTO is indicated in the display for proper AUTO(changeover) operation. |
| Auto (changeover) may have been disabled during installation. | |
| Fan runs continuously for hours at different times of the day | Review programmable fan settings entered during programming |
| Filter monitor indicates "CHECK FILTER" too soon for proper filter servicing interval. | Check with your filter supplier and modify Filter Monitor settings to match your servicing intervals. |