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10.2 Fault codes
Displayed
fault code
protection tripped
H00
No fault present
H15
Compressor temperature sensor fault, outdoor unit
H23
Refrigerant temperature sensor fault, indoor unit
H38
Incorrect indoor unit/outdoor unit combination
H42
Compressor pressure too low
H62
Float switch fault
H64
Refrigerant pressure too high
H72
Cylinder sensor fault
H76
Control panel communication defective, indoor unit
H90
Indoor unit/outdoor unit communication defective
H95
Indoor unit/outdoor unit connections defective
H98
High-pressure overload protection, outdoor unit
F12
Pressure switch activated
F14
Compressor speed defective, outdoor unit
F15
Fan motor blocked, outdoor unit
F16
Total operating current protection
F20
Compressor overheating protection, outdoor unit
F22
Power transistor overheating protection (IPM)
F23
Direct current peaks detected, outdoor unit
F24
Fault in the refrigerant circuit
Fault when switching between
F25
cooling and heating cycles
F27
Pressure switch fault
F36
Air temperature sensor fault, outdoor unit
F37
Water inlet temperature sensor fault, indoor unit
F40
Outlet pipe temperature sensor fault, outdoor unit
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Fault /
For more than 5 seconds
For more than 5 seconds
For more than 1 minute
For more than 5 seconds
For more than 5 seconds
> 1 minute after switch-on
Four times within 20 minutes
Four times within 20 minutes
Twice within 30 minutes
Three times within 20 minutes
Four times within 30 minutes
Three times within 30 minutes
Seven times in succession
Twice within 20 minutes
Four times within 30 minutes
For more than 1 minute
For more than 5 seconds
For more than 5 seconds
For more than 5 seconds
Fault
prerequisite
---
Compressor temperature sensor
(defective or not connected)
Refrigerant temperature sensor
(defective or not connected)
---
PCB, indoor unit/outdoor unit
Pipe temperature sensor, outdoor unit
Expansion valve or filter blocked
---
Insufficient refrigerant
PCB, outdoor unit
Compressor
Float switch
High-pressure sensor, outdoor unit
(defective or not connected)
Cylinder sensor
• Control panel, indoor unit
---
(defective or not connected)
Indoor unit/outdoor unit connections
PCB, indoor unit/outdoor unit
---
Supply voltage, indoor unit/outdoor unit
High-pressure sensor, outdoor unit
Water pump or water loss
---
Expansion valve or filter blocked
Too much refrigerant
PCB, outdoor unit
Pressure switch
Compressor, outdoor unit
PCB, outdoor unit
Fan motor, outdoor unit
Too much refrigerant
PCB, outdoor unit
Compressor cylinder temperature sensor
Expansion valve or filter blocked
Insufficient refrigerant
PCB, outdoor unit
Compressor
Heat exchange defective
IPM (power transistor)
PCB, outdoor unit
Compressor
Insufficient refrigerant
PCB, outdoor unit
Insufficient compression
Four-way valve
V-shaped coil
Pressure switch
Air temperature sensor, outdoor unit
(defective or not connected)
Water inlet temperature sensor
(defective or not connected)
Outlet pipe temperature sensor, outdoor unit
(defective or not connected)
10.2
To check
first
---
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