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10.2
10.2 Fault codes
Displayed
fault code
Fault /
protection tripped
Fault
prerequisite
To check
first
H00
No fault present
---
---
H15
Compressor temperature sensor fault, outdoor unit
For more than 5 seconds
Compressor temperature sensor
(defective or not connected)
H23
Refrigerant temperature sensor fault, indoor unit
For more than 5 seconds
Refrigerant temperature sensor
(defective or not connected)
H38
Incorrect indoor unit/outdoor unit combination
---
PCB, indoor unit/outdoor unit
H42
Compressor pressure too low
---
Pipe temperature sensor, outdoor unit
Expansion valve or filter blocked
Insufficient refrigerant
PCB, outdoor unit
Compressor
H62
Float switch fault
For more than 1 minute
Float switch
H64
Refrigerant pressure too high
For more than 5 seconds
High-pressure sensor, outdoor unit
(defective or not connected)
H72
Cylinder sensor fault
For more than 5 seconds
Cylinder sensor
H76
Control panel communication defective, indoor unit
---
• Control panel, indoor unit
(defective or not connected)
H90
Indoor unit/outdoor unit communication defective
> 1 minute after switch-on
Indoor unit/outdoor unit connections
PCB, indoor unit/outdoor unit
H95
Indoor unit/outdoor unit connections defective
---
Supply voltage, indoor unit/outdoor unit
H98
High-pressure overload protection, outdoor unit
---
High-pressure sensor, outdoor unit
Water pump or water loss
Expansion valve or filter blocked
Too much refrigerant
PCB, outdoor unit
F12
Pressure switch activated
Four times within 20 minutes
Pressure switch
F14
Compressor speed defective, outdoor unit
Four times within 20 minutes
Compressor, outdoor unit
F15
Fan motor blocked, outdoor unit
Twice within 30 minutes
PCB, outdoor unit
Fan motor, outdoor unit
F16
Total operating current protection
Three times within 20 minutes
Too much refrigerant
PCB, outdoor unit
F20
Compressor overheating protection, outdoor unit
Four times within 30 minutes
Compressor cylinder temperature sensor
Expansion valve or filter blocked
Insufficient refrigerant
PCB, outdoor unit
Compressor
F22
Power transistor overheating protection (IPM)
Three times within 30 minutes
Heat exchange defective
IPM (power transistor)
F23
Direct current peaks detected, outdoor unit
Seven times in succession
PCB, outdoor unit
Compressor
F24
Fault in the refrigerant circuit
Twice within 20 minutes
Insufficient refrigerant
PCB, outdoor unit
Insufficient compression
F25
Fault when switching between
cooling and heating cycles
Four times within 30 minutes
Four-way valve
V-shaped coil
F27
Pressure switch fault
For more than 1 minute
Pressure switch
F36
Air temperature sensor fault, outdoor unit
For more than 5 seconds
Air temperature sensor, outdoor unit
(defective or not connected)
F37
Water inlet temperature sensor fault, indoor unit
For more than 5 seconds
Water inlet temperature sensor
(defective or not connected)
F40
Outlet pipe temperature sensor fault, outdoor unit
For more than 5 seconds
Outlet pipe temperature sensor, outdoor unit
(defective or not connected)
Summary of Contents for LIA 12IM
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