Daikin DX17VSS B Series Installation Instructions Manual page 36

T
roubleshooTing
Thermostat Control board
Display LED Display
Control detects a high power supply voltage
43 E43
condition.
The control detects the outdoor temperature
44 E44 outside recommended operational range.
Unit may continue to operate normally.
The control is unable to start the Cooling
mode test because indoor heat has been
45 E45
turned on by thermostat. Please set thermo-
stat to off position.
The control is unable to start the System
Verification test because indoor heat has
47 E47
been turned on by thermostat. Please set
thermostat to off position.
The control is unable to enter Charging
Mode because indoor heat has been turned
49 E49
on by thermostat. Please set thermostat to
off position.
This indicates there is a voltage issue on
50 E50 the control board. See service manual for
troubleshooting information.
This indicates potential communication is-
*
51 1 E51 sues have been detected by the outdoor unit
control board.
This error indicates the equipment is
experiencing frequent compressor faults.
52 - Control has determined continued operation
is acceptable. This indicates they may be a
problem with the equipment.
This error indicates the equipment is expe-
riencing frequent outdoor unit control board
and/or motor faults. Control has determined
53 -
continued operation is acceptable. This
indicates they may be a problem with the
equipment.
This error indicates the equipment is expe-
riencing frequent low discharge superheat
faults.
54 -
Control has determined continued operation
is acceptable. This indicates they may be a
problem with the equipment.
This error indicates the equipment is experi-
encing frequent high discharge temperature
55 - faults. Control has determined continued
operation is acceptable. This indicates they
may be a problem with the equipment.
The control has detected if the Outdoor Suc-
56 E56
tion Temperature Sensor is out of range.
This indicates the control is sensing sweat-
57 - ing on the cooling loop.
<3.5 - 5.0 ton only>
(*1) Network communication error (Refer to "NETWORK TROUBLESHOOTING")
01_EN_DZ17VSA.indd 36
Description Probable Causes
• High line voltage supply
• Ambient air conditions too high or low
• Heat provided by secondary heating source
• Heat provided by secondary heating source
• Heat provided by secondary heating source
• High or low voltage from supply voltage or
frequency
• Faulty control board
• Noise
• Communication wiring disconnected
• Stop valve not completely open
• The compressor wire is lost phase
• Compressor motor failure
• Obstruction in fan rotation
• Outdoor fan motor not connected properly
• Outdoor fan not running
• Faulty control board
• Noise
• Thermistors inoperable or improperly connected
• Faulty indoor EEV or indoor EEV coil
• Faulty control board
• Faulty outdoor EEV or outdoor EEV coil
• Discharge thermistor inoperable or improperly
connected
• Discharge thermistor is put in incorrect position
or off
• Low refrigerant charge
• Overcharge
• Faulty compressor
• Suction thermistor inoperable or not properly
connected
• Faulty reversing valve
• Refrigerant Leak
• Low refrigerant charge
• Faulty indoor EEV or indoor EEV coil
• Thermistors inoperable or improperly connection
• Verify unit is connected to power supply as specified on rating
plate
• Correct high line voltage condition; Contact local utility if needed
• Cycle power; re-try during usable ambient temperature range
• Turn off Furnace or heater using thermostat before operation
• Turn off Furnace or heater using thermostat before operation
• Turn off heater using thermostat before operation
• Correct low/high line voltage condition; Contact local utility if
needed
• Replace control board if necessary
• Contact local utility if needed
• Check communication wiring; Repair as needed
• 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 neces-
sary
• 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
• Check the connection to thermistors; Repair/replace if needed
• Check indoor EEV; Replace if needed
• Check indoor EEV coil; Replace if needed
• Replace control board if necessary
• Check outdoor EEV: Replace if needed
• Check outdoor EEV coil: Replace if needed
• 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
• Check the connection to suction thermistor; Repair/replace if
needed
• Check reversing valve; Replace if needed
• Test for system leaks using leak test procedure
• Check refrigerant charge level; Adjust if needed
• Check indoor EEV; Replace if needed
• Check indoor EEV coil; Replace if needed
• Check the connection to thermistors; Repair/replace if needed
36 36
Corrective Actions
2020/11/11 21:29:00