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Zone Sensor Status Indicators
The Unit Control Processor (UCP) has the capability of
communicating four input signals (HEAT, COOL, ON, SER-
VICE) to the respective Zone Sensor Module (ZSM) icons
when appropriately wired.
Each of these Zone Sensor icons will respond to the UCP in
1 of 3 conditions;
OFF – No icon will be displayed when the unit is not
operating.
ON – Indicates that the unit is operating in the Mode
reflected by the illuminated icon.
FLASHING – Indicates that the system is not operating
properly and some type of service may be required.
The UCP Status Input conditions and the respective zone
sensor terminals are;
Terminal # 7 – (HEAT Icon)
ON – Indicates by a continuously illuminated icon
that the unit is operating in the Heating Mode.
FLASHING – The HEAT FAILURE icon indicates
that a system failure in the Heating Mode has
occurred.
Terminal # 8 – (COOL Icon)
ON – Indicates by a continuously illuminated icon
that the unit is operating in the Cooling Mode.
FLASHING – The COOL FAILURE icon indicates
that a system failure in the Cooling Mode has
occurred.
Terminal # 9 – (ON Icon)
OFF – The Colon (:) displayed in the Clock is not
flashing, the System is OFF.
ON – The Colon (:) displayed in the Clock is
flashing, the System is ON.
FLASHING – The TEST icon indicates the System
is operating in the Test Mode.
Troubleshooting
Terminal # 10 – (SERVICE Icon)
ON - Indicates by a continuously illuminated icon
that the unit requires service.
FLASHING – Indicates that a Fan Failure has
occurred and service is required.
If number 2 is selected for option 16 in the Options Menu,
any of the FLASHING signals will sound an audible buzzer.
To reset the buzzer, press the ERASE Key.
Battery Replacement
To replace the battery, depress the metal retainer clip and
the battery will spring forward. Refer to the illustration for
battery and clip location.
Replace the battery with the same voltage and type
stamped on the battery.
17
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