GVZC20 Service Manual

TROUBLESHOOTING
99
(*1) This message displayed when using the CTKO4 thermostat.
(*2) This specication of *VZC20**1 or earlier model are di󰀨erent from this specication. For details, see the service manual that matches the major revisoin of model name.
Fault Code
Control Board
LED Display
Transmitted Climate
Talk Message
Thermostat Fault Probable Causes Corrective Actions
35 E35 HIGH CURRENT
Board detected a high current
condition.
● Short circuit condition
● Stop valve not completely open
● Overcharge
● Faulty control board
● Faulty compressor
● Check installation clearances.
● Check the opening of stop valve, should be full
open; Repair/replace if needed
● Check refrigerant charge level; Adjust if
needed
● Replace control board if necessary
● Check the compressor; Repair/replace if
needed.
36 E36 STARTUP ERROR
The control encountered an
abnormal condition during the
startup procedure.
● Blocked/restricted condenser coil
and/or lines
● The compressor wire is lost phase
● Inconsistent compressor load
● Faulty control board
● Check and clean condenser coil and/or lines
● Check the wire between control board and
compressor
● Replace control board if necessary
37 E37 OD CTRL FAIL4
Indicates the control board may
need to be replaced.
● Outdoor fan motor not connected
properly
● Faulty control board
● Check wiring from outdoor fan motor to control
board; Repair if needed
● Replace control board if necessary
38 E38 COMP VOLTAGE
The control has detected a voltage
related issue with the compressor.
● High or low voltage from supply
● The compressor wire is lost phase
● Faulty control board
● Correct low/high line voltage condition; Contact
local utility if needed
● Check the wire between control board and
compressor
● Replace control board if necessary
39 E39 OD CTRL FAIL5
Indicates the control board may
need to be replaced.
● Thermistors inoperable or improperly
connected
● Faulty control board
● Check the connection to thermistors;
Repair/replace if needed
● Replace control board if necessary
40 E40 COMP MISMATCH
Control determines that its
compressor requirement is different
than the compressor capability.
● Bluetooth® Shared Data Loader
BTSDL01 not correct
● Control board mismatch
● Check Bluetooth® Shared Data Loader
BTSDL01 data vs. air conditioner model
● Verify control board size vs. air conditioner
model; Replace control board if necessary
41 E41 LOW REFRIGERANT
The control has detected a low
refrigerant condition.
● Refrigerant leak
● Low refrigerant charge
● Thermisters inoperable or not
properly connected
● Test for system leaks using leak test procedure
● Check refrigerant charge level; Adjust if
needed
● Checkthe connection to thermistor;
Repair/replace if needed
42 E42 LOW LINE VOLT
Control detects a low power supply
voltage condition.
● Low line voltage supply
● Check circuit breakers and fuses; Replace if
needed
● Verify unit is connected to power supply as
specified on rating plate
● Correct low line voltage condition; Contact
local utility if
needed
43 E43 HIGH LINE VOLT
Control detects a high power
supply voltage condition.
● High line voltage supply
● Verify unit is connected to power supply as
specified on rating plate
● Correct high line voltage condition; Contact
local utility
if needed
44 E44 OP TEMP RANGE
The control detects the outdoor
temperature outside recommended
operational range. Unit may
continue to operate normally.
● Ambient air conditions too high or
low
● Cycle power; re-try during usable ambient
temperature range
45 E45 NO COOLING TEST
The control is unable to start the
Cooling mode test because indoor
heat has been turned on by
thermostat. Please set thermostat
to off position.
● Heat provided by secondary heating
source
● Turn off heater using thermostat before
running AHRI mode
46 E46 NO HEATING TEST
The control is unable to sart the
Heating mode test becaue indoor
heat has been turned on by
thermostat. Please set thermostat
to off position.
● Heat provided by secondary heating
source
● Turn off heater using thermostat before
running AHRI mode
47 E47 NO SYS VER TEST
The control is unable to start the
System Verification test because
indoor heat has been turned on by
thermostat. Please set thermostat
to off position.
● Heat provided by secondary heating
source
● Turn off heater using thermostat before
operation
48 E48 NO PUMP DOWN
The control is unable to enter the
Pump Down Mode because indoor
heat has been turned on by
thermostat. Please set thermostat
to off position.
● Heat provided by secondary heating
source
● Turn off heater using thermostat before
operation
49 E49 NO CHARGE MODE
The control is unable to enter
Charging Mode because indoor
heat has been turned on by
thermostat. Please set thermostat
to off position.
● Heat provided by secondary heating
source
● Turn off heater using thermostat before
operation
50 E50 LINE VOLT CTRL
This indicates there is a voltage
issue on the control board. See
service manual for troubleshooting
information.
● High or low voltage from supply
● Faulty control board
● Correct low/high line voltage condition; Contact
local utility if needed
● Replace control board if necessary
51*
2
E51 OD COMM ERROR
This indicates potential
communication issues have been
detected by the outdoor control
board.
● Communication wiring disconnected
● Check communication wiring; Repair as
needed
52 - COMP FAIL MINOR
This error indicates the equipment
is experiencing frequent
compressor faults. Control has
determined continued operation is
acceptable. This indicates they may
be a problem with the equipment.
● Stop valve not completely open
● The compressor wire is lost phase
● Compressor motor failure
● Check the opening of stop valve, should be full
open; Repair/replace if needed
● Check the wire between control board and
compressor
● Inspect compressor motor for proper function;
Replace if necessary