GVZC20 Service Manual
SERVICING
46
Error
Code
Control Board
LED Display
Transmitted Climate
Talk Message *1
Description Possible Causes Corrective Actions
EE
No display (EE
display is EMG
mode)
INTERNAL FAULT
• No power supply to ID
blower / no 24 volt power to
control board
• Blown fuse or circuit breaker
• Control board has an
internal fault
• Manual disconnect switch OFF
• No power supply to ID blower / no 24 volt power to control
board
• Blown fuse or faulty circuit breaker
• Control board has internal fault
• Assure 208/230 volt and 24 volt power to blower and control board.
• Check fuse F2U on control board
• Check for possible short in 208/230 volt and 24 volt circuits. Repair as
necessary.
• Replace the control board.
Eb E_Eb No Display
Selecting "no heater kit" and
receiving electric heat
demand
• No heater kit selected
• Select the valid heater kit on thermostat
• Valid dip switch selection (heater kit selection out of range of the unit
configuration)
Ed E_Ed
Check Heater Kit Dip Switches
(CHECK HTR DIPSW)
Heater Kit dip switches not
set properly
• Invalid heater kit selected • Set correct dip switches
E5 E_E5 BLOWN FUSE Fuse Open
• Fuse (F1U) is blown
• Connector TB10 is open
• Replace fuse
• Check wiring to AUX alarm, heater kit, communication connection.
EF E_EF
Auxiliary Contacts Open (AUX ALARM
FAULT)
Auxiliary Switch Open
• High water level in the evaporation coil
• The connected alarm device is activated
• Auxiliary Alarm terminals (TB4, TB5) are open
• Check water level in drain pan
• Check alarm device.
• Close Auxiliary terminals TB4 and TB5 if not used
d0 E_d0
Data Not Yet On Network (NO NET
DATA)
Data not on Network • No shared data on the network
• Populate shared data set using Bluetooth® Shared Data Loader
BTSDL01.
d1 E_d1 Invalid Data On Network (INVALID DATA) Invalid Data on Network • Wrong shared data on the network
• Populate shared data set using Bluetooth® Shared Data Loader
BTSDL01.
d4 E_d4
Invalid Bluetooth® Shared Data Loader
BTSDL01 data (INVALID MC DATA)
Invalid Bluetooth® Shared
Data Loader BTSDL01 Data
• Wrong Bluetooth® Shared Data Loader BTSDL01 data
• Replace circuit board
• Rewrite data using the correct Bluetooth® Shared Data Loader
BTSDL01
b0 E_b0
Blower Motor Not Running
(MOTOR NOT RUN)
Blower Motor not running
• Fan/motor obstruction
• Power interruption (low voltage)
• Incorrect / loose wiring
• Check for obstruction on the fan/motor
• Verify the input voltage at the motor
• Check wiring or tighten wiring connections if needed
• Replace circuit board or motor
b1 E_b1 Blower Communication Error
Blower Motor Communication
error
• Incorrect / loose wiring
• Power interruption (low voltage)
• Check wiring or tighten wiring connections if needed
• Verify the input voltage at the motor
• Replace circuit board or motor
b2 E_b2
Blower Motor HP Mismatch (MOTOR
MISMATCH)
Blower Motor HP Mismatch
• Incorrect size motor
• Invalid shared data
• Correct motor installation
• Populate shared data set using Bluetooth® Shared Data Loader
BTSDL01.
b3 E_b3 No Display
Blower Motor operating in
Power, Temp or Speed
Limiting conditions
• Fan/motor obstruction or blocked filters
• Power interruption (low voltage)
• Incorrect wiring
• Blockage in the airflow (ductwork) or ductwork
• Check for obstruction on the fan/motor/ductwork, clean filters
• Verify the input voltage at the motor
• Check wiring
(*1) This message is displayed when using the CTK04 thermostat.