GVZC20 Service Manual
SERVICING
90
CTK04 ADDENDUM
TROUBLESHOOTING - INDOOR UNIT FOR EEV APPLICABLE UNIT
DIRECTIONS TO COMFORTNET SYSTEM ADVANCED
FEATURE MENUS
Press MENU, scroll down and press COMFORTNET USER
MENU. Enter the date code (password) when prompted.
The date code is printed on the back of the thermostat; or
press MENU>EQUIPMENT STATUS and scroll down to
nd the date code. After you enter the date code, select air
handler to view the system menus.
DIAGNOSTICS
Accessing the air handler’s diagnostics menu provides
ready access to the most recent six faults detected by the
air handler. Faults are stored most recent to least recent.
Any consecutively repeated fault is stored a maximum of
three times. Example: A clogged return air lter causes the
air handler’s motor to repeatedly enter a limiting condition.
The control will only store this fault the rst three consecu-
tive times the fault occurs.
NOTE: It is highly recommended that the fault history be
cleared after performing maintenance or servicing the air
handler.
IDENTIFICATION
The identication menu displays the model number, serial
number and control software revision for the equipment. A
model number check will help determine if the equipment
shared data is correct for the unit (if the model number is
not correct for the air handler, a Bluetooth® Shared Data
Loader BTSDL01 will be required to load the proper data).
NOTE: Consecutively repeated faults are shown a maximum of 3 times.
ADVANCED FEATURES DIAGNOSTICS MENU CHART
ADVANCED FEATURES INDENTIFICATION MENU CHART