GVZC20 Service Manual

TROUBLESHOOTING
100
(*1) This message displayed when using the CTKO4 thermostat.
Fault Code
Control Board
LED Display
Transmitted Climate
Talk Message
Thermostat Fault Probable Causes Corrective Actions
53 - PCB PR FAN MIN
This error indicates the equipment
is experiencing frequent outdoor
control board and/or motor faults.
Control has determined continued
operation is acceptable. This
indicates there may be a problem
with the equipment.
● Obstruction in fan rotation
● Ooutdoor fan motor not connected
properly
● Outdoot fan not running
● Faulty control board
● Noise
● Check and clean grille of any debris
● Check wiring from outdoor fan motor to
control board; Repair if needed
● Check outdoor fan motor & wiring;
Repair/replace if needed
● Replace control board if necessary
54 - EEV MINOR
This error indicates the equipment
is experiencing frequent low
discharge superheat faults.
Control has determined continued
operation is acceptable. This
indicates they may be a problem
with the equipment.
● Thermistors inoperable or improperly
connected
● Faulty TXV
● Faulty control board
● Check the connection to thermistors;
Repair/replace if needed
● Check TXV; Replace if needed
● Replace control board if necessary
55 - HI DIS TEMP MIN
This error indicates the equipment
is experiencing frequent high
discharge temperature faults.
Control has determined continued
operation is acceptable. This
indicates they may be a problem
with the equipment.
● Discharge thermistor inoperable or
improperly connected
● Discharge thermistor is put on
incorrect position or off
● Low refrigerant charge
● Overcharge
● Faulty compressor
● Check discharge thermistor resistance and
connections; Repair/replace as needed
● Check discharge thermistor position
● Check refrigerant charge level; Adjust if
needed
● Check refrigerant charge level; Adjust if
needed
● Check the compressor; Repair/replace if
needed
57 - CL LOOP SWEAT
This indicates the control is
sensing sweating on the cooling
loop.
● Refrigerant Leak
● Low refrigerant charge
● Faulty TXV
● Thermistors inoperable or improperly
connection
● Test for system leaks using leak test
procedure
● Check refrigerant charge level; Adjust if
needed
● Check TXV; Replace if needed
● Check the connection to thermistors;
Repair/replace if needed
B0 Eb0
NO ID AIRFLOW
The estimated airflow from indoor
subsystem is near to 0 CFM.
● Failed indoor blower motor
● Indoor fan motor not properly
connected
● Too much static pressure
● Check ID fan motor wiring and connectors;
Repair/replace if needed
● Check ID fan motor; Replace if needed
B9 Eb9
LOW ID AIRFLOW
Estimated airflow from motor is
lower than the airflow requirement.
● Failed indoor blower motor
● Indoor fan motor not properly
connected
● Too much static pressure
● Check ID fan motor wiring and connectors;
Repair/replace if needed
● Check ID fan motor; Replace if needed
D0 Ed0 NO NET DATA
Control board does not have the
necessary data for it to properly
perform its functions.
● Air conditioner is wired as part of a
communicating system and integrated
control module does not contain any
shared data.
● Replace control board if necessary
● Re-write shared data using Bluetooth®
Shared Data Loader BTSDL01
D1 Ed1 INVALID DATA
Control board does not the
appropriate data needed to
properly perform its functions.
● Air conditioner is wired as part of a
communicating system and integrated
control module contains invalid shared
data or network data is invalid for the
integrated control module.
● Replace control board if necessary
● Re-write shared data using Bluetooth®
Shared Data Loader BTSDL01
D2 Ed2 INVALID SYSTEM
The airflow requirement is greater
than the airflow capability of the
indoor subsystem.
● Air conditioner/heat pump is wired as
part of a communicating system and
outdoor unit requires airflow greater
than indoor unit's airflow capability
● Shared data is incompatible the
system or missing parameters
● Communication wiring has loose
connection.
● Verify shared data is correct for your specific
model; Repopulate data if required
● Check communication wiring. Repair as
needed.
D3 Ed3 INVALID CONFIG
There is a mismatch between the
shared data and the control
physical hardware.
● Shared data sent to integrated control
module does not match hardware
configuration.
● Verify shared data is correct for your specific
model; Repopulate data if required.
D4 Ed4 INVALID MC DATA
The Bluetooth® Shared Data
Loader BTSDL01 data has been
rejected.
● Shared data on Bluetooth® Shared
Data Loader BTSDL01 has been
rejected.
● Verify shared data is correct for your specific
model; Repopulate data if required.
11 E11 RUN SYS TEST
This test is required at startup.
Installer should navigate to the
ComforrtNet User Menu, choose
Air Conditioner, then EQUIP TEST
and SYSYTEM TEST. Selecting
ON will run the required test.
Display will clear once testing is
complete.
● Incomplete SYSTEM TEST
● SYSTEM TEST is running
MESSAGE ONLY
Items below are messages only displayed on the thermostat screen.
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