How to fix
Check Thermostat Mode and Fan Settings
Make sure your thermostat is set to the correct operating mode—heat, cool, or auto—depending on your comfort needs. Also, verify that the fan speed is set to Auto. Leaving the fan set to run continuously at high or low speed may prevent the fan coil from properly reaching the desired room temperature. Using Auto allows the thermostat to adjust fan operation based on actual heating or cooling demand, improving overall performance and comfort.
Choose your thermostat model to proceed troubleshooting:
Unilux Pro AM Thermostat
2. Ensure the temperature sensor is functioning
The thermostat may have an incorrect temperature reading, forcing the fan coil to turn off before reaching the true set temperature. You can test the accuracy of the thermostat reading by using a thermometer to measure the temperature near the thermostat.
If the temperature does match, the thermostat may be located where sunlight or drafts are impacting the temperature directly around it. If the temperature does not match the thermostat’s reading, the thermostat’s temperature sensor may be faulty, and a replacement is needed.
If further troubleshooting is required, please book a service appointment with a qualified HVAC technician to proceed.
Warning: The following troubleshooting steps should only be followed by a certified HVAC technician. If you are a resident, please contact your local HVAC repair service.
3. Ensure valve actuators are responding to system call
Use a multimeter to confirm that the thermostat is sending a voltage signal (24V AC) to the valve actuator when heating or cooling is called for.
Remove the front plate of the thermostat by gently prying it from the wall-mounted rear plate.
Place one probe on the common terminal (C)
To test call for cool: place the other probe on terminal Y
To test call for heat: place the other probe on terminal W
If a reading of ~24 VAC appears, the thermostat is sending the appropriate system call. If the actuator does not respond, a replacement is needed. If there is no voltage reading, the thermostat may not be wired correctly or may be faulty. See installation instructions for more details.
Universe Thermostat
2. Ensure the temperature sensor is functioning
The thermostat may have an incorrect temperature reading, forcing the fan coil to turn off before reaching the true set temperature. You can test the accuracy of the thermostat reading by using a thermometer to measure the temperature near the thermostat.
If the temperature does match, the thermostat may be located where sunlight or drafts are impacting the temperature directly around it. Verify by using the same thermometer to measure the temperature of another room that feels similar to the rest of the suite. If the reading is different, the thermostat will need to programmed with a temperature offset. Instructions for setting a temperature offset can be found here.
If the temperature does not match the thermostat’s reading, the thermostat’s temperature sensor may be faulty, and a replacement is needed.
If further troubleshooting is required, please book a service appointment with a qualified HVAC technician to proceed.
Warning: The following troubleshooting steps should only be followed by a certified HVAC technician. If you are a resident, please contact your local HVAC repair service.
3. Verify thermostat is set to correct system mode
Failure to connect the thermostat to the correct system mode will cause the HVAC system to not operate as expected and may lead to damage to the fan coil. You can verify and change the system mode with the following steps:
Press the gear icon on the top right of the thermostat screen.
Select “Installer Setup” from the list of options.
Enter the installer password *please contact us if you require a password
Select “System Option” from the left-hand settings menu. Select either the “Fan Coil” or “Heat Pump” radio option.
If using a fan coil, continue to the “Fan Coil” button from the left-hand settings menu. Select either “2P” for a 2-pipe system, or “4P” for a 4-pipe system.
If using a 2-pipe system, select “aux” or “no aux” to determine if the system uses an auxiliary heater.
Hit the “Home” button at the top right to return to the thermostat main screen.
Test to ensure the fan coil or heat pump is now reaching the set temperature.
4. Ensure valve actuators are responding to system call
Use a multimeter to confirm that the thermostat is sending a voltage signal (24V AC) to the valve actuator when heating or cooling is called for.
Remove the front plate of the thermostat by gently prying it from the wall-mounted rear plate.
Place one probe on the common terminal (C)
To test call for cool: place the other probe on terminal Y
To test call for heat: place the other probe on terminal W
If a reading of ~24 VAC appears, the thermostat is sending the appropriate system call. If the actuator does not respond, a replacement is needed. If there is no voltage reading, the thermostat may not be wired correctly, or may be faulty. See installation instructions for more details.
Universal Fan Coil Thermostat
2. Ensure the temperature sensor is functioning
The thermostat may have an incorrect temperature reading, forcing the fan coil to turn off before reaching the true set temperature. You can test the accuracy of the thermostat reading by using a thermometer to measure the temperature near the thermostat.
If the temperature does match, the thermostat may be located where sunlight or drafts are impacting the temperature directly around it. Verify by using the same thermometer to measure the temperature of another room that feels similar to the rest of the suite. If the reading is different, the thermostat will need to programmed with a temperature offset. Instructions for setting a temperature offset can be found here.
If the temperature does not match the thermostat’s reading, the thermostat’s temperature sensor may be faulty, and a replacement is needed.
If further troubleshooting is required, please book a service appointment with a qualified HVAC technician to proceed.
Warning: The following troubleshooting steps should only be followed by a certified HVAC technician. If you are a resident, please contact your local HVAC repair service.
3. Verify thermostat is set to correct system mode
a. Hold the [menu] button to enter the advanced settings menu.
b. Once the menu has opened, press the [menu] button again until reaching setting “P02”.
c. There are four systems modes. Use the following chart to determine which mode you require. Then press the [▲] / [▼] buttons to reach that mode.
| 2-Pipe Standard | 2P |
| 4-Pipe Standard | 4P |
| 2-Pipe with Auxiliary Heating | 2H |
| 2-Pipe with Aquastat | 2A |
| 2-Pipe with Auxiliary Heating & Aquastat | 2A |
d. Press [SELECT] to confirm and return to the home screen.
Test the fan coil to ensure the system is now working correctly.
2. Ensure the temperature sensor is functioning
The thermostat may have an incorrect temperature reading, forcing the fan coil to turn off before reaching the true set temperature. You can test the accuracy of the thermostat reading by using a thermometer to measure the temperature near the thermostat.
If the temperature does match, the thermostat may be located where sunlight or drafts are impacting the temperature directly around it. Verify by using the same thermometer to measure the temperature of another room that feels similar to the rest of the suite. If the reading is different, the thermostat will need to programmed with a temperature offset. Instructions for setting a temperature offset can be found here.
If the temperature does not match the thermostat’s reading, the thermostat’s temperature sensor may be faulty, and a replacement is needed.
If further troubleshooting is required, please book a service appointment with a qualified HVAC technician to proceed.
Warning: The following troubleshooting steps should only be followed by a certified HVAC technician. If you are a resident, please contact your local HVAC repair service.
3. Verify thermostat is set to correct system mode
a. Hold the [menu] button to enter the advanced settings menu.
b. Once the menu has opened, press the [menu] button again until reaching setting “P02”.
c. There are four systems modes. Use the following chart to determine which mode you require. Then press the [▲] / [▼] buttons to reach that mode.
| Fan Coil System | Thermostat Mode |
|---|---|
| 2-Pipe Standard | 2P |
| 4-Pipe Standard | 4P |
| 2-Pipe with Auxiliary Heating | 2H |
| 2-Pipe with Aquastat | 2A |
| 2-Pipe with Auxiliary Heating & Aquastat | 2A |
d. Press [SELECT] to confirm and return to the home screen.
Test the fan coil to ensure the system is now working correctly.
4. Ensure valve actuators are responding to system call
Use a multimeter to confirm that the thermostat is sending a voltage signal (24V AC) to the valve actuator when heating or cooling is called for.
Remove the front plate of the thermostat by gently prying it from the wall-mounted rear plate.
Place one probe on the common terminal (C)
To test call for cool: place the other probe on terminal Y
To test call for heat: place the other probe on terminal W
If a reading of ~24 VAC appears, the thermostat is sending the appropriate system call. If the actuator does not respond, a replacement is needed. If there is no voltage reading, the thermostat may not be wired correctly or may be faulty. See installation instructions for more details.
