Alliance Air Conditioning Error Codes


1. Fixed speed Vertu midwall units

E1 EEPROM error
E2 Zero crossing detection error
E3 Indoor fan error
E5 Room temp sensor open or short
E6 Indoor coil sensor open or short
EC Refrigerant leak detected

2. Atlantic Midwall units

E1 Outdoor tube sensor fault
E2 Room temp sensor open or short
E3 Indoor coil sensor open or short
E5 Indoor fan fault
E6 EEPROM error
E7 External feedback fault – Check interconnecting wiring
E8 Overheat detection / defrosting

3. Inverter midwall units

E0 EEPROM error
E1 Indoor and outdoor communication error
E2 Zero crossing detection error
E3 Indoor fan error
E4 Indoor room temp sensor open or short
E5 Indoor coil sensor open or short
EC Refrigerant leak detected
F1 Outdoor temp sensor open or short
F2 Condensor coil sensor open or short
F3 Compressor discharge sensor open or short
F4 Outdoor EEPROM error
P0 IPM malfunction or IGBT over current
P1 Over or under voltage protection
P2 Temperature protection of compressor top (normally short of refrigerant)
P4 Inverter compressor drive error

4. Fixed speed under ceiling/cassette/ducted units

E1 EEPROM error
E2 Zero crossing detection error
E3 Indoor fan error
E5 Room temp sensor open or short
E6 Indoor coil sensor open or short
EC Refrigerant leak detected

5. Inverter under ceiling/cassette/ducted units

E0 Communication between indoor and outdoor
E1 Phase rotation/phase missing
E2 Communication error between indoor unit and master unit
E4 Outdoor temp sensor error
E5 Compressor discharge temp sensor
E8 Outdoor unit address error
E9 Power volt error
H0 Communication malfunction between IR341 and 780034
H1 Communication between 0537 or 9177 and 780034
H2 Quantity of outdoor unit decreases
H3 Quantity of outdoor unit increases
H4 P6 protection detected 3 times
H5 P2 detected 3 times in 30 minutes
H6 P4 detected 3 times in 100 minutes
H7 Indoor unit decrease error
H8 Discharge pressure sensor error
H9 P9 detected 3 times in 30 minutes
P0 Inverter compressor top temperature protection
P1 HP protection
P2 LP protection
P3 Inverter compressor current protection
P4 Compressor discharge temp protection (short of refrigerant)
P5 Outdoor condensor high temp protection
P6 Inverter module protection
P7 Current protection No.1 Fixed compressor
P8 Current protection No.2 Fixed compressor
P9 Fan motor protection
L0 DC inverter module protection
L1 DC supply low voltage
L2 DC supply high voltage protection
L4 MEC Failure
L8 Frequency protection
L9 Frequency protection

6. MAC Cassette units

E2 Room temp sensor failure
E3 Coil temp sensor failure
E4 Condensor sensor failure
E5 Water pump temp sensor
E6 Outdoor malfunction
E7 EEPROM malfunction
E8 Water-level alarm

7. Package units




E0 Phase rotation/phase missing
E1 Outdoor coil sensor in system A
E2 Outdoor coil sensor in system B
E5 Indoor coil sensor in system A
E6 Indoor coil sensor in system B
E9 Indoor temp sensor error
EA Outdoor ambient sensor error
EB Wire controller output error
P0 Overcurrent protection in system A
P1 Overcurrent protection in system B
P2 Overcurrent protection for outdoor fan
P3 Comprehensive protection for outdoor fan
P4 Protection for HP/LP or discharge temp in system A
P5 Protection for HP/LP or discharge temp in system B
P6 HP protection initiated inT2 evaporator stops the outdoor unit fan
P7 HP protection initiated inT2 evaporator stops the outdoor unit fan and compressor
P8 Protection for condenser at high temp in system A
P9 Protection for condenser at high temp in system B
PC Anti-freezing protection for evaporator in system A
PD Anti-freezing protection for evaporator in system B
PF Defrosting

8. Portable units

HP HP alarm
Ft Full tray or full tank
Pf Probe failure
Lt Low temp
E1 Room temp sensor
E2 Evaporator temp sensor
E3 Condensor temp sensor
P1 Bottom tray is full

8. Water heaters (Retro fit)

E1 Phase reversal/phase missing error
E2 Communication error between unit and wired control or sensor damaged
E3 Outlet water temp sensor error
E4 Water temp sensor failure in the water tank
E5 Condensor temp sensor error
E6 Outdoor ambient temp sensor error
E7 Sensor failure at water pump outlet
E9 T8 temp sensor error
Ed Sensor failure at double pipe refrigerant outlet
P1 HP protection/air in system/pump not starting/no water
P2 System current protection
P4 Tt HP protection
P5 Condenser HP protection
P8 Protection for over temp at condenser outlet
P9 Anti-freezing protection
Pb Anti-freezing protection
HO Indoor and outdoor units unmatched

Swimming pooll heaters

E1 Phase rotation/phase missing
E2 Outdoor unit and wire controller communication error
E3 Outlet water temp sensor error
E4 Inlet water temp sensor error
E5 Evaporator pipe temp sensor error
E7 Ambient temp sensor error
E9 Water flow switch error
EE Discharge pipe temp sensor error
P0 Discharge pressure over-high protection
P1 Low pressure protection
P4 Compressor over current protection
P6 Evaporator over temp protection
Pb Anti-freeze protection
Pf Discharge temp protection (too high)

Integrated water heater

E0 Error of sensor T5U
E1 Error of sensor T5L
E2 Tank and wired controller communication error
E4 Condensor pipe temp sensor error
E5 Outdoor ambient temp sensor error
E6 Sensor Tp error
E8 Electric leakage protection
LA Ambient temp is outside of range 5° _ 43°
P0 Condensor pipe temp overflow protection
P2 High dicharge temp
P3 Open compressor circuit protection
P4 Compressor overcurrent protection
P8 Open upper e-heater circuit protection
P9 Upper e-heater overloaded protection
Pa Open lower e-heater circuit protection
Pb Lower e-heater overloaded protection

Commercial water heater

E1 Phase rotation/phase missing
E2 Communication failure between wired remote and main unit
E3 Outlet water temp sensor failure
E4 Water temp sensor in the water tank failure
E5 Condenser temp sensor failure
E6 Outdoor ambient temp sensor failure
E7 Electric heating pipe temp sensor failure
Ec Water inlet temp sensor error
Eb Exhaust temp sensor error (TP temp)
P0 System LP protection
P1 System HP protection (deficient circulating pump/pump faulty also possible)
P2 Current protection for system 2
P3 Current protection for system 1
P8 Protection for excessive high outlet water temp
Pb Anti-freezing protection








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