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If the thermostat does not respond when a button is pushed it may be because the keypad has
been locked. A Lock icon “ “ will appear when pushing any buttons other than the buttons
outlined above.
No. 3 – Normal Heat Pump/Add-on Heat Pump. This switch is factory preset (to the OFF position) to
operate in the normal heat pump mode. If your heating and cooling system is an Add-on heat
pump configuration, your contractor changed the position of this switch to match your equipment.
Do not change the position of this switch as it could result in extraordinarily high operating costs.
No. 4 – This switch is not used and must remain in the OFF position.
No. 5 – Free LED 1 with LCD Filter Symbol. When moved to the ON position, this switch turns on a
replace Filter icon on the LCD display screen when a 24-volt signal is sent to the LED 1 terminal.
If your heat pump has the required controls for automatically determining when to change the air
filter, this feature is beneficial. Consult your contractor for further information.
No. 6 – Free LED 2 with LCD Wrench Symbol. When moved to the ON position, this switch turns on a
Wrench icon on the LCD display screen when a 24-volt signal is sent to the LED 2 terminal. If your
heat pump has the required controls for automatically signaling when a particular problem exists,
this feature is beneficial. Consult your contractor for further information.
110-792B 7/12/01 8:28 AM Page 25