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De Dietrich HPI - AWHP MIT-IN iSystem Manual

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5 Troubleshooting
5.1 Anti-hunting
When the heat pump is in "anti-short cycle" operating mode, the
symbol "?" flashes. This is a normal operating mode. When the restart
temperature is reached, operation will be guaranteed.
1. Press the "?" key.
The message Operation assured when the restart temperature
will be reached is displayed. When the restart temperature is
reached, operation will be guaranteed.
This message is not an error message but an item of
information.
5.2 Messages
In the case of failure, the control panel displays a message and a
corresponding code.
1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.
2. Switch off heat pump and start up again.
The heat pump starts up again autonomously when the cause of
the failure has been lifted.
3. If the code is displayed again, correct the problem by following the
instructions in the table below:
Code
Messages Description Checking / solution
B00 BL.PSU ERROR
The PSU PCB is incorrectly
configured
Parameter error on the PSU PCB
4 Contact the professional who takes care of
maintenance of the appliance
B02 BL.FLOW S.
The MIT flow sensor is short
circuited or on an open circuit.
Bad connection.
4 Contact the professional who takes care of
maintenance of the appliance.
B08 BL.BL INPUT OPEN
The BL inlet on the PCU PCB
terminal block is open. No
antifreeze protection.
The contact connected to the BL inlet is open.
4 Contact the professional who takes care of
maintenance of the appliance.
Parameter error.
4 Contact the professional who takes care of
maintenance of the appliance.
Bad connection.
4 Contact the professional who takes care of
maintenance of the appliance.
AWHP MIT-IN iSystem 5. Troubleshooting
09/01/13 - 300027618-001-02
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