Air-to-water Heat Pump
62
MONOBLOC
TYPE
(5) Temperature sensor error
Temperature sensor error
Is the plug of
the temperature sensor correctly
inserted to the socket?
Is the resistance of
temperature sensor correct?
Yes
Inserted it resersely.
Replace the mainboard.
No
Yes
Replace the
temperature sensor.
No
(6) Communication malfunction E6
Communication error E6
Is the communication
line of the unit connected?
Does the communication
line work normally?
Is the outdoor unit
electrically powered on?
Replace the communication line.
No
Yes
No
Yes
No
Yes
No
Is the communication line
of the unit connected correctly?
Connect the line.
Reconnect the line.
Supply power to
the outdoor unit.
19.6.3 Diagnosis of the driving board
(1) Overvoltage of direct current: It is detected that the voltage of direct current is over 420V after energization.
If the protection occurs for 6 times within one hour, it can not be resumed unless it is deenergized and
reenergized.
(2) Under-voltage of direct current: It is detected that the voltage of direct current is lower than 200V after
startup of the unit. If the protection occurs for 6 times within one hour, it can not be resumed unless it is
deenergized and reenergized.
(3) PFC abnormality: The protection against PFC abnormality is detected after the PFC works for 10s. If
the protection occurs for 6 times within one hour, it can not be resumed unless it is deenergized and
reenergized.
(4) IPM protection of driving board: The protection against IPM abnormality is detected after the IPM works for
10s. If the protection occurs for 6 times within one hour, it can not be resumed unless it is deenergized and
reenergized.
(5) Overcurrent protection of compressor: The protection occurs when the instantaneous current is detected
over 45A. If the protection occurs for 6 times within one hour, it can not be resumed unless it is deenergized
and reenergized.
(6) Superheat protection of IPM driving board: The protection occurs when the internal temperature of IPM
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