6. APPeNdIX
6.5 Fault explanation
Display
Failure
Cause
Unit Action
Solution
3
Low pressure
protection
Low pressure
switch tripped
Stop and alarm
1, Check if low pressure switch is ok/is refrigerant leaking 2, change low pressure
switch or recharge refrigerant and find leak
4
Extra high
exhaust temp.
Protection
Exhaust temp.
Of comp.
Is too high
Stop and alarm
1, Check if there is an obstruction in the gas system/check water flow is ok under
heating mode; 2,change blocked parts and make water flow smoothly
5
Over current
protection
Compressor
current draw
too high
Stop and alarm
1, Check if there is loss of power phase/check if the loop of the compressor is short
circuited; 2,examine and repair power supply/change the compressor.
6
High pressure
protection
High pressure
switch tripped
Stop and alarm
1, Check if high pressure switch is ok/check if there is any obstructions in the gas
system.Check if the fan works well 2,change h-p switch/remove blocked parts
repair fan
9
Temp.Sensor
of compressor
failure
Problem with
the temp sensor
Stop and alarm
1, Check if the exhaust temp.Sensor of the compressor is good;2,replace temp sensor
E
Power phase
sequence
protection
Wrong or
loss of power
supply
Stop and alarm
1, Check if there is something wrong with the power supply, 2,swap two of the three
phase of power supply/remove power supply failure
