Daikin DZ9VC - Troubleshooting: Fault Codes; Fault Code Analysis (Part 1)

34

ClimateTalk
Fault Code
PCB LED
Display
Transmitted
ClimateTalk Message
Thermostat Fault Probable Causes Corrective Actions
12 E12 OD CTRL FAIL1 Indicates a general memory error.
● High electrical noise
● Faulty control board
● Replace control board if necessary
13 E13
HI PRESSURE C
(C = CRITICAL)
This error indicates the equipment is
experiencing frequent high pressure faults.
● Blocked/restricted condenser coil and/or lines
● Stop valve not completely open
● Overcharge
● Outdoor fan not running
● High pressure switch (HPS) inoperable
● Faulty EEV or TXV
● Faulty indoor EEV coil
● Faulty control board
● Check and clean condenser coil and/or lines
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Check outdoor fan motor & wiring; Repair/replace if
needed
● Check indoor EEV or TXV; Replace if needed
● Check indoor EEV coil; Replace if needed.
● Replace control board if necessary
1
4 -
HI PRESSURE M
(M = MINOR)
This error indicates the equipment is
experiencing frequent high pressure faults.
Control has determined continued operation
is acceptable. This indicates they may be
a problem with the equipment.
● Blocked/restricted condenser coil and/or lines
● Stop valve not completely open
● Overcharge
● Outdoor fan not running
● High pressure switch (HPS) inoperable
● Faulty indoor EEV or TXV
● Faulty indoor EEV coil
● Faulty control board
● Check and clean condenser coil and/or lines
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Check outdoor fan motor & wiring; Repair/replace if
needed
● Check indoor EEV or TXV; Replace if needed
● Check indoor EEV coil; Replace if needed.
● Replace control board if necessary
● Check high pressure switch; Replace if necessary
15 E15 LOW PRESSURE C
This error indicates the equipment is
experiencing frequent low pressure faults.
● Stop valve not completely open
● Restriction in refrigeran
t lines
● Low refrigerant charge
● Refrigerant leak
● Low pressure sensor inoperable or not properly
connected
● Indoor fan motor not functioning correctly
● Faulty indoor EEV or TXV
● Faulty indoor EEV coil
● Faulty control board
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check for restrictions in refrigerant line;
Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Test for system leaks using leak test procedure
● Check the connection to low pressure sensor;
Repair/replace if needed
● Check indoor EEV or TXV; Replace if needed
● Check indoor EEV coil; Replace if needed
● Check indoor blower motor & wiring; Repair/replace if
needed
● Replace control board if necessary
16 - LOW PRESSURE M
This error indicates the equipment is
experiencing frequent low
pressure faults.
Control has determined continued operation
is acceptable. This indicates they may be
a problem with the equipment.
● Stop valve not completely open
● Restriction in refrigerant lines
● Low refrigerant charge
● Refrigerant leak
● Low pressure sensor inoperable or not properly
connected
● Indoor fan motor not functioning correctly
● Faulty indoor EEV or TXV
● Faulty indoor EEV coil
● Faulty control board
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check for restrictions in refrigerant line;
Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Test for system leaks using leak test procedure
● Check the connection to low pressure sensor;
Repair/replace if needed
● Check the adjustment of TXV; Replace if needed
● Check indoor blower motor & wiring; Repair/replace if
needed
● Replace control board if necessary
17 E17 COMPRESSOR FAIL
This error indicates the equipment is
experiencing frequent compressor faults.
● 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
18 E18 OD CTRL FAIL2
Indicates the control board may need to be
replaced.
● Outdoor fan motor not connected properly
● Faulty control board
● Noise
● Check wiring from Outdoor fan motor to control board;
Repair if needed
● Replace control board if necessary
19 E19 PCB OR FAN FAIL
This error indicates the equipment is
experiencing frequent outdoor control board
and/or motor faults.
● Obstruction in fan rotation
● Outdoor fan motor not connected properly
● Outdoor 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
21 E21 EEV CTRL FAIL
This error indicates the equipment is
experiencing frequent low discharge
superheat faults.
● Thermistors inoperable or improperly connected
● Faulty indoor EEV coil
● Faulty indoor EEV or TXV
● Faulty outdoor EEV coil
● Faulty outdoor EEV
● Overcharge
● Faulty pressure sensor
● Faulty control board
● Check the connection to thermistors; Repair/replace if
needed
● Check indoor EEV coil; Repair/replace if needed
● Check indoor EEV or TXV; Repair/replace if needed
● Check outdoor EEV coil; Repair/replace if needed
● Check outdoor EEV; Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Check pressure sensor; Repair/replace if needed
● Replace control board if necessary
Lorem ipsum