Operation Manual

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Installation
Guide
IF…. THEN….
Display will not come on Check if batteries are installed correctly.
Check if batteries are fresh and of correct type.
Press the RESET key.
Battery symbol flashes Batteries are low. Replace with fresh batteries.
Air-conditioning will not come on System switch is on the HEAT or OFF position.
(COOL symbol not flashing) Current temperature is lower than set temperature. Check current program.
Air-conditioning has been turned off within 5 minutes, and automatic delay has been activated to
protect the compressor.
Air-conditioning will not come on Check if the air-conditioning main switch is turned on;
(COOL symbol flashing) it may have been turned off.
Heating will not come on System switch is on the COOL or OFF position.
(HEAT symbol not flashing) Current temperature is higher than set temperature. Check current program.
Heating will not come on Check if the furnace switch and/or pilot flame is turned on; it may have been turned off.
(HEAT symbol flashing) Allow some time for the heater to heat up and the fan to activate. Most heaters will heat up the
system for a short while before warm air can be ventilated by the fan.
HE/HG jumper inside the thermostat is not set correctly. Check installation guide.
The current temperature is It is common for the setting and the displayed temperature to differ occasionally. The thermostat
different from the scheduled will be activated if this difference persists.
temperature There is a temporary override by the user.
The system is on HOLD. Press HOLD once to resume normal setting.
TROUBLESHOOTING GUIDE
Changing Batteries
When the battery symbol on the LCD display flashes, it indicates that the batteries are running low and
have to be replaced. However, it is recommended for the batteries to be replaced every year even if the indicator
is not flashing yet. To replaced batteries:
Set the thermostat system switch to the OFF position and have the new batteries on-hand.
Open the thermostat by pressing on the 2 tabs on the top.
Remove the old batteries and install new ones quickly.
Close the thermostat to its original position.
If new batteries are inserted within 20 seconds of removing the old ones, the existing time and programs
will not be cleared. Otherwise, the display will show 9:00AM and the thermostat will have to be re-programmed.
Reset
If the thermostat shows an abnormal display or if you want to clear all existing programs, use a pointed
object to press the 'R' key. Time and programs will need to be set again after a Reset.
Specification
Model: THM302M/ THM303M
Number of Programs: 5+1+1 Day Programming with 4 programs per day
Temperature display range: 0°C - 55°C (34°F - 99.5°F)
Humidity display range: 20% to 95%
Temperature setting range: 5°C - 35°C (41°F - 95°F)
Humidity setting range: 20% to 70%
Storage temperature range: -20°C to 50°C (-4°F - 122°F)
Battery: 2 x AA size batteries
Introduction
This thermostat can replace common residential thermostats and it is designed for use with most
electric, oil or gas heating and air-conditioning systems that use low voltage control. Please see
compatibility chart for more details.
Weekday / Saturday / Sunday programming with 4 programs per day
Display temperature with 0.1° resolution
Only two AA size batteries required (included)
Built-in protection timing for the air-conditioner compressor
If you have any questions concerning the installation or programming of the thermostat, please call
1-888-468-6876 for our technical assistance.
THM302M / THM303M Installation Guide
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