AIR-TO-WATERHEATPUMP MAINTENANCE
102
UNITS MAINTENANCE
1 ERROR CODE LIST
¾ Complete Unit Code
Code
Indication
Error Name Source of Error Signal Control Description
F4
Outdoor environment
temp sensor error
z The plug on temperature
sensor is not correctly
connected to the socket on
mainboard.
z The resistance of temperature
sensor is not correct.
It will be automatically cleared
after the failure is removed.
F6
Defrost temp sensor
error
z The plug on temperature
sensor is not correctly
connected to the socket on
mainboard.
z The resistance of temperature
sensor is not correct.
It will be automatically cleared
after the failure is removed.
F7
Discharge temp sensor
error
z The plug on temperature
sensor is not correctly
connected to the socket on
mainboard.
z The resistance of temperature
sensor is not correct.
It will be automatically cleared
after the failure is removed.
F5
Suction temp sensor
error
z The plug on temperature
sensor is
not correctly connected to the
socket on mainboard.
z The resistance of temperature
sensor is not correct.
It will be automatically cleared
after the failure is removed.
EF Outdoor fan error
z Mainboard of outdoor unit is
damaged.
z The wire connecting the wiring
terminals of the mainboard
breaks.
If it occurs for 6 times during
one hour, it is cleared by
de-energization. If it occurs for
less than 6 times, it will be
automatically cleared.
E5
Overload protection of
compressor or driver
error
z It is the compressor overload
switch error or the compressor
drive protection, and please
see the indicating lamp on the
main board of the outdoor unit
or the 88 nixie tube for the
protection code.
Drive failure; it will be
automatically cleared after 1
min.
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