Air-to-water Heat Pump
55
MONOBLOC
TYPE
Code Indication Error Name Source of Error Signal Control Description
F7
Discharge temp sensor
error
①
The plug on temperature
sensor is not correctly
connected to the socket
on mainboard.
②
The resistance of
temperature sensor
is not correct.
It will be automatically
cleared after the failure is
removed.
F5 Suction temp sensor error
①
The plug on temperature
sensor is not correctly
connected to the socket
on mainboard.
②
The resistance of
temperature sensor
is not correct.
It will be automatically
cleared after the failure is
removed.
EF Outdoor fan error
①
Mainboard of outdoor
unit is damaged.
②
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.
E1
Comp High-pressure
protection
①
Comp High-pressure
switch is broken or
the wiring is loose.
②
The water in the tank
is not enough.
③
The installation of tank
temp sensor is not correct.
④
The gas valve and liquid
valve are not fully open.
⑤
The electronic
expansion valve can
not work normally.
De-energize the unit and
then, energize it again. If the
malfunction is removed, the
code will be cleared.
E3
Comp Low- pressure
protection
①
Comp Low-pressure
switch is broken or
the wiring is loose.
②
The system has leaked.
③
The fans stop running
or reverse.
It will be cleared if the
malfunction is removed after
the unit has been turned o.
E4
Comp Discharge temp
protection
①
The resistance of
temperature sensor
is not correct.
②
The electronic expansion
valve is blocked.
③
The system has leaked.
④
Mainboard of outdoor
unit is damaged.
It will be cleared if the
discharge temp is lower than
92
℃
.
C5 Cpacity switch error
①
The jumper trips o.
De-energize the unit and
then energize it again. If the
malfunction is removed, the
code will be cleared.
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