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Called Flash Codes. First try turning off everything at the breaker for at least 2 hours and preferably overnight. Turn back on and wait 15 minutes for self test to complete.
I’m seeing 5 red 5 green flash is compressor failure. Not sure if this is your unit or not. Cycle power to outdoor unit 30seconds and resume. Start with a fan only operation no heat/cool. Let unit run, if no issue then begin and heat/cool cycle. If problem occurs then likely narrows issues to outside. Hope this helps!!
If there are no active failures or lockouts, the display will show a double dash, "- -". If there is a code listed, see the unit "Diagnostic Codes" chart for a list of definitions.
Error Codes
Problem
FP
Freeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F. No Action required. This setting will disengage when the room temperature rises above 43°F.
Fd
Front Desk switch is closed. All outputs are switched off. Open front desk switch to allow occupant unit operation.
Eo
Un-Configured Service Board - All operation held awaiting configuration. Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps.
EH
Emergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off. Open front emergency hydronic switch to allow occupant unit operation.
LS
Load Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off. Open load shedding switch to allow occupant unit operation.
On
Control is configured to respond to a wired thermostat. No action if a wired thermostat is being used. Otherwise, see Configuration Settings.
oP
Open Door Lockout (DS1 & DS2 open; wireless). Close Room Door. Unit will not condition space with door open.
nP
Window Switch Lockout - (LS & INN open). Close Room Door or Window. Unit will not condition space with door or window open.
HP
Heat Sentinel - (WIAT > u3). No action required. This setting will disengage when the room temperature falls.
Ur
Un-Rented Status (EHH & INN or wireless). Front Desk needs to set to Rented mode (if applicable).
F1
Indoor Ambient Thermistor reads outside the range -20°F to 200°F & the wireless thermostat is not communicating to the unit control or Indoor Ambient Thermistor (IAT) without a wireless remote thermostat reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat.
F2
Wireless Remote Thermostat failure. Replace Wireless Thermostat.
F3
Indoor Ambient Thermistor reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor.
F4
Indoor Coil Thermistor either above or below operating tolerances. Replace Red Indoor Coil Thermistor.
F5
Wireless Thermostat failure. Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat.
F6
Indoor Discharge Thermistor either above or below operating tolerances. Replace Yellow Indoor Discharge Thermistor.
Fb
Low Remote Battery Warning. Replace Batteries in Wireless Devices.
H1
High Voltage Protection engaged. Power supply voltage is to high. Check for incoming power at correct voltage.
br
Brown Out Protection engaged. Power was lost or voltage is low. Check for incoming power at correct voltage.
L6
Discharge Air Too Hot. Clean Filter or Remove Air Blockage.
LC
Outdoor Coil Thermistor temperature high. Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning.
C2
Indoor Air Recirculation. Large delta between thermostat and return. Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal.
C5
Outdoor Coil temperature too high for outdoor ambient temperature. Check for Blocked Outdoor Air or Clean Coil.
C1
Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C3
Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C4
Indoor Coil froze up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C6
Poor Unit Performance. Check for blower motor, compressor, or electric heat operation.
C7
Indoor Freezing Lockout (ICT - IAT > 20) +10 Min. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
14.2.2 To Make a Diagnosis1 Timer LED starts to blink and the unit automatically stops the operation.
2 Press the CHECK button on the remote control continuously for 5 seconds.
3 "- -" will be displayed on the remote control display.
Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
and signal will be transmit to the main unit.
5 Each press of the button (? or ?) will increase error code
number and transmit error code signal to the main unit.
6 When the latest abnormality code on the main unit and
code transmitted from the remote control are matched,
Power LED will light up for 30 seconds and a "beep" sound
(continuously for 4 seconds) will be heard. If no codes are
matched, Power LED will light up for 0.5 seconds and no
sound will be heard.
7 The breakdown diagnosis mode will be canceled unless
pressing the CHECK button continuously for 5 seconds or
operating the unit for 30 seconds.
8 The LED will be off if the unit is turned off or the RESET
button on the main unit is pressed.
Diagnosis
display
Abnormality / Protection control
Abnormality
Judgement
Emergency operation
Primary location to verify
H00
No abnormality detected
-
Normal operation
H11
Indoor / Outdoor abnormal communica
tion
> 1 min after starting
operation
Indoor fan operation
only
• Internal / external cable connections
• Indoor / Outdoor PCB
H14
Indoor intake air temperature sensor
abnormality
Continue for 5 sec.
-
• Intake air temperature sensor (detec
tive or disconnected)
H15
Outdoor compressor temperature sensor
abnormality
Continue for 5 sec.
-
• Compressor temperature sensor
(detective or disconnected)
H16
Outdoor Current Transformer open cir
cuit
-
-
• Outdoor PCB
• IPM (Power transistor) module
H19
Indoor fan motor mechanism locked
7 times occurance
continuously
-
• Indoor PCB
• Fan motor
H23
Indoor heat exchanger temperature sen
sor abnormality
Continue for 5 sec.
O
(Cooling only)
• Heat exchanger temperature sensor
(detective or disconnected)
H24
Indoor heat exchanger temperature sen
sor 2 abnormality
Continue for 5 sec.
-
• Heat exchanger temperature sensor
(detective or disconnected)
H27
Outdoor intake air temperature sensor
abnormality
Continue for 5 sec.
O
• Outdoor temperature sensor (detec
tive or disconnected)
H28
Outdoor heat exchanger temperature
sensor abnormality
Continue for 5 sec.
O
• Outdoor heat exchanger temperature
sensor (detective or disconnected)
H30
Outdoor discharge air temperature sen
sor abnormality
Continue for 5 sec.
-
• Outdoor temperature sensor (detec
tive or disconnected)
H33
Indoor / Outdoor wrong connection
-
-
• Indoor / Outdoor supply voltage
H38
Indoor / Outdoor mismatch (brand code)
H50
Ventilation motor abnormality
7 times occurance
continuously
-
• Indoor PCB
• Ventilation motor
H51
Nozzle lock abnormality
2 times occurance
continuously
-
• Nozzle
H52
Limit switch abnormality
-
-
• Indoor PCB
H97
Outdoor fan motor mechanism locked
2 times occurance
within 30 minutes
-
• Indoor PCB
• Fan motor
H98
Indoor high pressure protection
-
-
• Air filter dirty
• Air circulation short circuit
H99
Indoor heat exchanger anti-freezing pro
tection
-
-
• Insufficient refrigerant
• Air filter dirty
F11
Cooling / Heating cycle changeover
abnormality
4 times occurance
within 30 minutes
-
• 4-way valve
• V-coil
F90
PFC control
4 times occurance
within 10 minutes
-
• Voltage at PFC
F91
Refrigerantion cycle abnormality
2 times occurance
within 20 minutes
-
• No refrigerant
(3-way valve is closed)
F93
Compressor rotation failure
4 times occurance
within 20 minutes
-
• Compressor
F95
Cool high pressure protection
4 times occurance
within 20 minutes
-
• Outdoor refrigerant circuit
F96
IPM (power transistor) overheating pro
tection
4 times occurance
within 30 minutes
-
• Excess refrigerant
• Improper heat radiation
• IPM (Power transistor)
F97
Outdoor compressor overheating protec
tion
4 times occurance
within 10 minutes
-
• Insufficient refrigerant
• Compressor
F98
Total running current protection
3 times occurance
within 20 minutes
-
• Excess refrigerant
• Improper heat radiation
F99
Outdoor Direct Current (DC) peak detec
tion
7 times occurance
continuously
-
• Outdoor PCB
• IPM (Power transistor)
• Compressor
Note:
"O" - Frequency measured and fan speed fixed.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until "beep" sound heard following by pressing the "CHECK" button at remote controller.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Codes Table) by using remote controller or Auto Switch at indoor unit. However, the remote controller signal receiving sound is changed from one "beep" to four "beep" sounds.
Serial communication error. This means that the indoor unit is not communicating with the outdoor unit usually because the outdoor unit is faulty. You can check the indoor unit by switching it to 'fan' mode and seeing if all functions work normally (fan speed, louvers move as directed). If it responds normally, then it's probably ok so you can turn your attention to the outdoor unit. A common problem with the outdoor controllers is that they are susceptible to bugs, geckos, etc. shorting them out which will mean replacement of the board.
Hi,
The red light indicates it's either heating or in defrost mode
Check the outdoor unit if the compressor is running - the large pipe on the outdoor unit should be hot on heating or cool to touch on cooling
When in heating mode - the indoor fan will not start until the indoor coil is warm enough
If the reversing valve that changes from heating to cooling is faulty then you may encounter the same symptoms too
Probably need a Refrig Tech to have a look at it?
Good luck
If a unit is in heating mode the outdoor unit is in cooling mode (outside always does opposite of indoor) after a while if there is a build up of ice on outdoor coil unit stops and puts hot gas through outdoor coil to clear it. The indoor fan stops to avoid and heat loss in area served buy unit once this has been done and indoor unit coil is hot again fan will start. This is the correct operation of the unit to save against bust could and reduced efficiency
Operation =
Flashing Display Timer = Yes
Turbo =
LED Display = E1
Explanation and Checking points = Indoor unit room thermistor error - Open or Closed Circuit - Check and replace if required
Operation = Yes
Flashing Display Timer = Yes
Turbo =
LED Display = E2
Explanation and Checking points = Indoor unit pipe thermistor error - - Open or Closed Circuit - Check and replace if required
Operation =
Flashing Display Timer =
Turbo = Yes
LED Display = E3
Explanation and Checking points = Indoor unit fan motor malfunction - Check and replace if required
Operation =
Flashing Display Timer = Yes
Turbo = Yes
LED Display = E6
Explanation and Checking points = EPROM error - Check and replace PCB if required
Operation = Yes
Flashing Display Timer = Yes
Turbo = Yes
LED Display = Flashing
Explanation and Checking points = Option code error - Check and input new option code if required via wireless remote controller
Operation = Yes
Flashing Display Timer =
Turbo = Yes
LED Display =
Explanation and Checking points = Outdoor unit temperature sensor - Open or Closed Circuit - Check and replace if required
After switching the indoor unit to cool, the indoor fan starts and the light flashes, lower the temperature setting to 16 degree centigrade. When the light stops flashing the outdoor fan and the compressor start, if not check the wiring connection going to the compressor contactor. Check if there is power supplying the holding coil of the contactor. If the contactor works, check the power on both contact points by using a volt meter. If the outdoor fan only works, you need to check line working pressure. If the standing pressure is low, compressor will not start.
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