Daikin DZ9VC - Troubleshooting: Fault Codes; Fault Code Analysis (Part 2)

35

22 E22 HI DISCH TEMP
This error indicates the equipment is experiencing
frequent high discharge temperature faults.
Discharge thermistor is not put on correct position.
● 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 the compressor; Repair/replace if needed
23 E23 DISCH TEMP FAIL
The control has detected that the Discharge
Tempera
ture Sensor is out of range.
● Discharge thermistor inoperable or improperly connected
● Check discharge thermistor resistance and connections;
Repair/replace as needed
24 E24 HPS OPEN The high pressure switch is open. ● High pressure switch (HPS) inoperable
● Check resistance on HPS to verify operation; Replace if
needed
25 -
AIR SENSOR FLT
The outdoor air temperature sensor is open or
shorted.
● Faulty outdoor thermistor sensor or disconnect ● Inspect and test sensor; Replace sensor if needed
26 E26 PRESSURE SENSOR
The control determines that the pressure sensor is
not reacting properly.
● Low pressure sensor inoperable or not properly
connected
● Check the connection to low pressure sensor;
Repair/replace if needed
27 E27 COIL TEMP FAIL1
The control detect that the Outdoor Defrost Sensor
is out o
f range.
● Outdoor defrost thermistor inoperable or not properly
connected
● Check the connection to OD defrost thermistor; Repair
as needed
28 E28 COIL TEMP FAIL2
The control has detected that the Outdoor Coil
Temperature Sensor is out of range.
● Outdoor coil thermistor inoperable or not properly
connected
● Check the connection to OD coil thermistor;
Repair/replace if needed
29 E29 LIQ TEMP FAIL
The contro
l has detected that the Liquid
Temperature Sensor is out of range.
● Liquid thermistor inoperable or not properly connected
● Check the connection to liquid thermistor; Repair/replace
if needed
30 E30 OD CTRL FAIL3
Indicates the control board may need to be
replaced.
● Wiring to control board disconnected
● Faulty control board
● Noise
● Check wiring to control board; Repair as needed
● Replace control board if necessary
31 E31 HI LEAK CURRENT
The control has detected high leakage current (high
voltage).
● Improper ground
● Faulty compressor
● Check ground screws/lugs and wiring; Repair/replace if
needed
● Check the compressor; Repair/replace if needed
32 E32 HI TEMP CTRL1
This error indicates the equipment is experiencing
high temperature faults on the outdoor control
board.
● Ambient air conditions too high
● Cooling bracket screw(s) missing or not properly
fastened (2-4 ton only)
● No or poor thermal grease coating between cooling
plumbing and cooling bracket on control board (2-4 ton
only)
● Outdoor fan low speed (5 ton only)
● No flow or limited fl
ow through control board cooling
circuit (potential restriction in line or low refrigerant) (2-4
ton only)
● Stop valve not completely open (2-4 ton only)
● Cycle power; re-try during usable ambient temperature
range
● Verify cooling bracket screws in place and secure;
Secure fasteners as needed (2-4 ton only)
● Check thermal grease inside cooling bracket on control
board; Apply additional grease as n
eeded
● Check outdoor fan motor & wiring; Repair/replace if
needed (5 ton only)
● Check for restriction in line
● Check refrigerant charge level; Adjust if needed (2-4 ton
only)
● Check the opening of stop valve, should be full open;
Repair/replace if needed (2-4 ton only)
33 - HI TEMP CTRL2
This error indicates the equipment is experiencing
high temperature faults on the outdoor control
board. Control ha
s determined continued operation
is acceptable. This indicates they may be a
problem with the equipment.
● Ambient air conditions too high
● Cooling bracket screw(s) missing or not properly
fastened (2-4 ton only)
● No or poor thermal grease coating between cooling
plumbing and cooling bracket on control board (2-4 ton
only)
● Outdoor fan low speed (5 ton only)
● No flow or limited flow through contro
l board cooling
circuit (potential restriction in line or low refrigerant) (2-4
ton only)
● Stop valve not completely open (2-4 ton only)
● Cycle power; re-try during usable ambient temperature
range
● Verify cooling bracket screws in place and secure;
Secure fasteners as needed (2-4 ton only)
● Check thermal grease inside cooling bracket on control
board; Apply additional grease as needed
● Check outd
oor fan motor & wiring; Repair/replace if
needed (5 ton only)
● Check for restriction in line
● Check refrigerant charge level; Adjust if needed (2-4 ton
only)
● Check the opening of stop valve, should be full open;
Repair/replace if needed (2-4 ton only)
34 E34 CURRENT SPIKE
Control Board detected a high current condition.
This indicates the potential for a short circuit.
● Current spike in supply
● Stop valve not c
ompletely open
● The compressor wire is lost phase
● Faulty control board
● Faulty compressor
● Check power supply for in-rush current during start-up or
steady state operation
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check the wire between control board and compressor
● Replace control board if necessary
● Check the compressor; Repair/replace if needed
ClimateTalk
Fault Code
PCB LED
Display
Transmitted
ClimateTalk Message
Thermostat Fault Probable Causes Corrective Actions