Control
40
Alarm Messages
In the event of an alarm message, try to re-start the unit with the safety switch.
If this does not work, try to solve the problem with the help of the table below. Call your installation contractor if
you need help.
Table : 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 order reversed 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 .
