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PROBLEM SOLUTION
Heat will not come on but the
symbol is flashing.
Air conditioning will not come on.
Air conditioning will not come on
but the symbol is flashing.
The thermostat turns the heating
or cooling systems on before my
programmed set times.
Heating system seems to cycle
too often.
1) Check if the furnace switch and/or pilot flame is turned on, as it may have been turned off.
2) Allow several minutes for the heating system 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. Also check that the
HE/HG setting is set correctly, if not change the position. (see Fan Operation Jumper HE/HG section)
3) If the heat still does not come on, double check the wiring installation.
1) Check and ensure that the thermostat is set to the COOL or AUTO mode.
2) Check and ensure that the set temperature is lower than the current (room) temperature.
3) You may have to wait up to 5 minutes before the air conditioning will turn on. The thermostat has a
built-in time delay to protect the air conditioner compressor from undesirable on/off sequences.
4) After a 5-minute wait, the air conditioning should now be on. Whenever the cooling system is
running, the symbol will flash.
1) Check if the air conditioning system’s main switch is turned on, as it may have been turned off.
2) Wait several minutes for the air conditioning system to activate. If the air conditioning still does not
come on, check the wiring installation again.
This is normal if the Pre-comfort Recovery system is enabled. The Pre-comfort Recovery will activate
the heating/cooling in advance of the actual programmed set time so that the room will be at the
desired temperature at the start of the program time. You may disable this feature in the
“option section”.
Check and ensure that you have selected a Cycle Rate that matches your particular heating system.
The default is set at Cr-3 for gas or oil forced air systems. If you find it still cycling too often, you may
wish to try a slower cycle rate or disable the cycling. When disabled, the thermostat will operate at a
fixed span of (plus or minus) ±0.5°C (±1.0°F). For example, if the programmed temperature is set at
20°C (68°F), the thermostat will turn the heat on if the current (room) temperature falls below 19.5°C
(67°F) and turn the heat off when the current (room) temperature reaches 20.5°C (69°F).
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