Troubleshooting; Anti-Hunting; Messages - DeDietrich AWHP 6 MR Installation And Service Manual

AWHP MIT-IN iSystem
8

Troubleshooting

8.1

Anti-hunting

8.2

Messages

Code Messages
B00 BL.PSU ERROR
B02 BL.MIT/MHR S.
B08 BL.BL INPUT OPEN
24/09/2012 - 300027606-001-01
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.
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:
Description
The PSU PCB is incorrectly
configured
The MIT flow sensor is short
circuited or on an open circuit.
The BL inlet on the PCU PCB
terminal block is open. No
antifreeze protection.
This message is not an error message but an item of
information.
Checking / solution
Parameter error on the PSU PCB
Set the type of generator again in the menu
4
#CONFIGURATION (Refer to the original rating plate)
Bad connection.
Check the wiring between the PCU PCB and the sensor.
4
Check that the SU PCB is correctly in place.
4
Check that the sensor has been correctly fitted.
4
Check the sensor resistor.
4
¼ "Sensor characteristics", page 15
See:
The contact connected to the BL inlet is open.
Check the contact on the BL inlet.
4
Parameter error.
Check the parameter E. BL.
4
Bad connection.
Check the wiring.
4
8. Troubleshooting
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108