Fault Codes – 2 Pipe Modular Multi

Do Not turn off the power supply before reading the fault codes, doing so will clear the diagnostic memory. Caution
must be taken when removing the access covers, as high voltages are present.
Fault diagnosis is available at three locations within the Air Conditioning system. :-
1. Remote Controller - press the check button (if installed)
2. Central Controller – press the check button (if installed)
3. Outdoor Unit – Inv & Fix switch positions 1 - 1 - 1

Code = 04
PCB = IFACE
Area = IFACE to INV
Condition = Communication failure
Criteria =

Code = 08
PCB = IN
Area = TC1 and TC2 coil sensors
Condition = Indoor heat exchange changes temperature but in wrong direction
Criteria =

Code = 0C
PCB = IN
Area = TA air temperature sensor
Condition = OC/SC
Criteria =

Code = 0b
PCB = IN
Area = Float switch circuit
Condition = OC
Criteria =

Code = 11
PCB = IN
Area = Fan motor
Condition = Short circuit
Criteria =

Code = 12
PCB = IN
Area = PCB
Condition = EEPROM failure
Criteria =

Code = 14
PCB = INV
Area = DC current sensor
Condition = INV compressor or transistor SC. Sensor OC
Criteria =

Code = 17
PCB = INV
Area = DC current sensor
Condition = INV compressor current detected during off cycle.
Criteria =

Code = 18
PCB = IFACE
Area = TE1 defrost sensor
Condition = OC/SC
Criteria =

Code = 1C
PCB = IFACE
Area = PCB
Condition = EEPROM failure
Criteria =

Code = 1d
PCB = INV
Area = DC current sensor
Condition = INV compressor overload
Criteria = > 1.5 times full load current

Code = 1F
PCB = INV
Area = DC current sensor
Condition = Excessive current detected after current release
Criteria =

Code = 21
PCB = INV
Area = INV Compressor
Condition = HP switch or klixon
Criteria = > 363 psig – 25 Bar

Code = 22
PCB = IFACE
Area = Pd sensor
Condition = Excessive pressure
Criteria = > 406 psig – 28 Bar

Code = 87
PCB = IFACE
Area = Input Phase
Condition = Missing phase
Criteria =

Code = 89
PCB = IFACE
Area = IN capacity settings
Condition = Too high
Criteria = > 135% outdoor unit

Code = 8d
PCB = IFACE
Area = Outdoor units - number of
Condition = Has fallen since last set up
Criteria =

Code = 8E
PCB = IFACE
Area = Outdoor units - number of
Condition = Is too high
Criteria = > 5

Code = 8F
PCB = FIX unit address
Area = Duplicated
Condition = When manually set
Criteria =

Code = 93
PCB = IN
Area = TC1 gas sensor
Condition = OC/SC
Criteria =

Code = 94
PCB = IN
Area = TC2 liquid sensor
Condition = OC/SC
Criteria =

Code = 95
PCB = IFACE
Area = PQ
Condition = Communication failure
Criteria = No INV outdoor unit

Code = 96
PCB = IFACE
Area = IN units - number of
Condition = Too many
Criteria = > 40

Code = 97
PCB = Central
Area = XY
Condition = Communication failure
Criteria =

Code = 98
PCB = Central
Area = XY
Condition = Duplicated addresses
Criteria =

Code = 99
PCB = Remote
Area = ABC
Condition = Communication failure
Criteria =

Code = 9A
PCB = IN
Area = TC1 gas sensor
Condition = Unauthorized temperature change
Criteria = Changed by > 5ºC after 15 minutes operation

Code = 9F
PCB = IN
Area = TC1 gas sensor and TC2 liquid sensor
Condition = Insufficient performance
Criteria = Changed by < 5ºC after 60 minutes operation

Code = A0
PCB = IFACE
Area = TD1 discharge sensor
Condition = OC/SC
Criteria =

Code = A1
PCB = IFACE
Area = TD2 discharge sensor
Condition = OC/SC
Criteria =

Code = A2
PCB = IFACE
Area = TS1 suction sensor
Condition = OC/SC
Criteria =

Code = A6
PCB = IFACE
Area = TD1 discharge sensor
Condition = High discharge temperature
Criteria = > 130ºC 3 times

Code = A7
PCB = IFACE
Area = TS1 suction sensor
Condition = High suction temperature
Criteria = > 60ºC for 10 minutes, 3 times

Code = AA
PCB = IFACE
Area = Pd pressure sensor
Condition = OC
Criteria =

Code = Ab
PCB = IFACE
Area = Pd and Ps pressure sensors
Condition = OC or crossed
Criteria =

Code = AE
PCB = IFACE
Area = TD1 discharge sensor
Condition = High discharge temperature (low load condition)
Criteria = > 110ºC, 3 times

Code = AF
PCB = IFACE
Area = Phase rotation
Condition = Incorrect
Criteria =

Code = b4
PCB = IFACE
Area = Ps sensor
Condition = Suction pressure too high during operation
Criteria = OC or < 138 psig – 9.5 Bar

Code = b5
PCB = IN
Area = CN17
Condition = Indoor unit emergency circuit
Criteria = Resistive connection

Code = b6
PCB = IN
Area = CN17
Condition = Indoor unit emergency circuit
Criteria = SC

Code = b7
PCB = Central
Area = Fault in connected group
Condition = Check local controller
Criteria =

Code = b9
PCB = IN
Area = Pressure sensor
Condition = OC
Criteria =

Code = bb
PCB = IFACE
Area = TD2 discharge sensor
Condition = High discharge temperature
Criteria = > 130ºC 3 times

Code = bd
PCB = IFACE
Area = TD2, Ps, Pd
Condition = FIX compressor contactor fault
Criteria = Operation detected during off cycle

Code = bE
PCB = IFACE
Area = Ps sensor
Condition = Low pressure
Criteria = < 3 psig – 0.21 Bar

Code = cF
PCB = IN
Area = Main and relay PCBs
Condition = Communication failure
Criteria =

Code = d1
PCB = IFACE
Area = INV outdoor unit
Condition = Duplicated within a system
Criteria =

Code = d2
PCB = IFACE
Area = FIX unit fault
Condition = Press SW04 for several seconds
Criteria = Fan of outdoor unit runs

Code =d3
PCB = IFACE
Area = TH inverter overheat sensor
Condition = OC/SC
Criteria =

Code = d4
PCB = IFACE
Area = TK1 oil level sensor primary side
Condition = OC/SC
Criteria =

Code = d5
PCB = IFACE
Area = TK2 oil level sensor secondary side
Condition = OC/SC
Criteria =

Code = d6
PCB = IFACE
Area = TK3 oil level sensor
Condition = OC/SC
Criteria =

Code = d7
PCB = IFACE
Area = TK1, 2, 3
Condition = Oil level low
Criteria = > 2 hours

Code = d8
PCB = IFACE
Area = TK1 oil level sensor primary side
Condition = No oil flow detected
Criteria = No temp change during oil level management

Code = d9
PCB = IFACE
Area = TK2 oil level sensor secondary side
Condition = No oil flow detected
Criteria = No temp change during oil level management

Code = dA
PCB = INV
Area = IGBT overheating
Condition =
Criteria =

Code = db
PCB = IFACE
Area = TK1 and TK2
Condition = No oil flow detected
Criteria = No temp change during oil level management

Code = dC
PCB = IFACE
Area = TK1
Condition = High oil temperature
Criteria = > 50ºC

Code = dd
PCB = IFACE
Area = FIX outdoor unit
Condition = Operation detected during off cycle
Criteria =

Code = dE
PCB = IFACE
Area = IN unit
Condition = Automatic addressing failure
Criteria =

Code = dF
PCB = IFACE
Area = Outdoor unit
Condition = Automatic addressing failure
Criteria =

Code = E1
PCB = IFACE
Area = FIX compressor 1
Condition = HP switch, klixon or overload relay
Criteria = Pd is > 363 psig – 25 Bar

Code = E5
PCB = IFACE
Area = INV compressor
Condition = HP switch or klixon
Criteria = Pd is > 363 psig – 25 Bar

Code = E6
PCB = IFACE
Area = FIX compressor 1
Condition = HP switch, klixon or overload relay
Criteria = Pd is > 363 psig – 25 Bar

Code = Eb
PCB = IFACE
Area = b6 code received from IN unit
Condition =
Criteria =

Code = F0
PCB = IFACE
Area = FIX compressor 2
Condition = HP switch, klixon or overload relay
Criteria = Pd is > 363 psig– 25 Bar

Code = F1
PCB = IFACE
Area = FIX compressor 2
Condition = HP switch, klixon or overload relay
Criteria = Pd is > 363 psig– 25 Bar
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