Daikin DZ20VC - Page 70

70
TROUBLESHOOTING
OUTDOOR UNIT ERROR CODES
Fault Code
Control Board
LED Display
Transmitted
Climate
Talk Messa
g
e *1
Thermostat Fault Probable Causes Corrective Actions
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 Temperature
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 E25 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
reactin
g
properl
y
.
• 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 detects that the
Outdoor Defrost Sensor is out
of ran
g
e.
• 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 ran
g
e.
• 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 control has detected that
the Liquid Temperature Sensor
is out of ran
g
e.
• 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 voltege).
• Improper ground
• Faulty compressor
•Check ground screws/lugs and wiring;
Repair/replace if needed
• Check the compressor; Repair/replace
if needed
32*
2
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
• No or poor thermal grease
coating between cooling plumbing
and cooling bracket on control
board
• No flow or limited flow through
control board cooling circuit
(potential restriction in line or low
refrigerant)
• Stop valve not completely open
• Cycle power; re-try during usable
ambient temperature range
• Verify cooling bracket screws in place
and secure; Secure fasteners as
needed
• Check thermal grease inside cooling
bracket on control board; Apply
additional grease as needed
• Check for restriction in line
• Check refrigerant charge level; Adjust
if needed
• Check the opening of stop valve,
should be full open; Repair/replace if
needed
33*
2
-HI TEMP CTRL2
This error indicates the
equipment is experiencing
high temperature faults on the
outdoor control board. Control
has 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
• No or poor thermal grease
coating between cooling plumbing
and cooling bracket on control
board
• No flow or limited flow through
control board cooling circuit
(potential restriction in line or low
refrigerant)
• Stop valve not completely open
• Cycle power; re-try during usable
ambient temperature range
• Verify cooling bracket screws are in
place and secure; Secure fasteners as
needed
• Check thermal grease inside cooling
bracket on control board; Apply
additional grease as needed
• Check for restriction in line
• Check refrigerant charge level; Adjust
if needed
• Check the opening of stop valve - it
should be fully open; Repair/replace if
needed
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 completely 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
(*2) The specification of DZ20VC0601B* or earlier models are different from this specification. For details, see the service manual that matches the major revision of model name.
(*1) This message is displayed when using the CTK04 thermostat.