11 Troubleshooting; Tripping The Safety Valve; Resolving Operating Errors; Types Of Error Code - DeDietrich MIT-M /E Installation, User And Service Manual

11 Troubleshooting

11.1

Tripping the safety valve

11.2

Resolving operating errors

Tab.123
Type of code
Warning
Blockage
Lock out
Tab.124 List of temporary error codes
Error Message
code
H00.17 DHW sensor Closed
H00.32 TOutside Open
7756241 - v02 - 19062020
If the safety valve is tripped too often, check to ensure the expansion
vessel is not blocked. Replace the expansion vessel if necessary.
If your appliance malfunctions, the status LED flashes and/or changes
colour and a message containing an error code is displayed on the main
screen of the control panel. This error code is important for the correct and
rapid diagnosis of the type of malfunction and for any technical assistance
that may be needed.
If an error occurs:
1. Make a note of the code displayed on the screen.
2. Remedy the problem described by the error code or contact the
installer.
3. Switch the heat pump off and back on to check that the cause of the
error has been removed.
4. If the code is displayed again, contact the installer.
11.2.1
The control panel can display three types of error codes:
Code format
Axx.xx
Hxx.xx
Exx.xx
Error codes
An error code is a temporary status, resulting from the detection of a heat
pump anomaly. The heat pump attempts to restart automatically until it
switches on.
When one of the following codes is displayed and the heat pump cannot
restart automatically, contact a maintenance technician.
Description
Domestic Hot Water tank temperature sensor is either shorted or measures a
temperature above range
Check the wiring between the central unit PCB and the sensor.
Check that the sensor has been fitted properly.
Check the Ohmic value of the sensor.
Replace the sensor if necessary.
Outside temperature sensor is either removed or measures a temperature below range
Check the wiring between the central unit PCB and the sensor.
Check that the sensor has been fitted properly.
Check the Ohmic value of the sensor.
Replace the sensor if necessary.
The outdoor temperature sensor must always be connected to the EHC–05 PCB. If
you have mistakenly connected the outdoor temperature sensor to the SCB-10 PCB,
you must reset the factory settings for the CN1 and CN2 parameters.

Types of error code

Colour of the status LED
Green flashing
Continuous red
Red flashing
11 Troubleshooting
MIT-M 99