Specifications

Control 40
Alarm Messages
In the event of an alarm message, try to r e-star t the unit with the safety switch.
If this does not work, try to solve the pr oblem with the help of the table below . Call your installation contractor if
you need help.
T able : Alarm Messages
Message Signification Cause Action
RETURN TEMP
Return line temperature sensor error; All
operation stopped, except circulation pump of
heating system
.
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .
FEED IN TEMP
Supply line temperature sensor error; All
operation stopped, except circulation pump of
heating system
.
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .
BRINE OUT TEMP
Brine out temperature sensor error /
Defrost temperature sensor error ( for air
source heat pump ) .
Sensor disconnected;
Sensor defective.`
Check the connections,the wire,
or change it .
OUTDOOR TEMP Outside air temperature sensor error;
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .
ROOM TEMP
Room air temperature sensor error;
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .
WARM WATER
TEMP
Water tank temperature sensor error;
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .
HIGH PRESS
All operation stopped; High pressure switch cut
out; compressor is stopped; No warm water is
produced
The wire disconnectted;
Refrigerance leakage, lack of refrigerance;
water flow stop in the room cycle.
Check the wire connection;
Refrigerance recharge;
Check the water cycled pump for the room
heating system;
Or
call your installation contractor .
LOW PRESS
All operation stopped; Low pressure switch cut
out; compressor is stopped; No warm water is
produced
The wire disconnectted;
No refrigerance (leakage out );
Pipe was plugged.
Check the wire connection;
Refrigerance recharge;
Check the pipe system;
Or
call your installation contractor .
CMP OVER
All operation stopped;
Compressor overload protection
The actual current over the contactor ‘s
allowed current.Compressor current too
large;or the AC contactor current adjust too
small.(6K,8K should be adjust to 11A;
10K,12K should be adjust to 14A;
16K,20K,25K,should be adjust to 16A)
Check the compressor;
Adjust the AC contactor’s current range;
Or call
your installation contractor .
ADD HEAT OVER
All operation stopped;
Electrical heater overheat .
The temperature of electrical heater over the
max allowed temperature.
Water flow too low or stoped.
Check the water cycled pump for the room
heating system;
Or call your installation contractor .
WTPUMP OVER
All operation stopped;
Water pump overheat .
The temperature of the water pump (room
heating cycle ) over the max allowed
temperature.No water in the cycle system.
Check the water cycled pump for the room
heating system;
Or call your installation contractor .
CMP AIR OVER
All operation stopped;
Compressor exhaust overheat .
Lack of refrigerance.
Refrigerance recharge;
Or
call your installation contractor .
POWER SUPPLY
Phase error;
For three-phase, the phase or der r eversed or
wrongly connected.
For single-phase, the “ three-phase option
port ” in the circuit board is not connected or
loose.
Check the connections,the wires.
Or Call your installation contractor
CMP TEMP
Compressor exhaust temperature sensor error;
Sensor disconnected;
Sensor defective.
Check the connections,the wire,
or change it .