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Installation
Manual
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.
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.
Entire display flashes Batteries are low. Replace with new batteries.
Air-conditioning will not come on System switch is on the HEAT or OFF position.
(symbol COOL not flashing) Current temperature is lower than set temperature. Press CURRENT to 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;
(symbol COOL 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. Press CURRENT to 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 manual.
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
THM301M Installation Manual
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.
! 4 weekday programs and 4 weekend programs
! Display temperature with 0.5° resolution
! Only two AA size batteries required (included)
! Built-in protection timing for the air-condition compressor
If you have any questions concerning the installation or programming of the thermostat, please call
1-888-468-6876 for our technical assistance.
Specification
Model: THM301M
Number of Programs: Weekly 5/2 day programs with 4 programs per day
Temperature measurement range: 1
Program setting range: 5
Storage temperature range: -20 to 50°C (-4
Battery: 2 x AA size batteries
°C - 37.5°C (34°F - 99.5°F)
°C - 35°C (41°F - 95°F)
°C °F - 122°F)
8


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