12 Troubleshooting
12.1 Resetting the safety thermostat
Danger
Before carrying out any work, cut off the mains supply to the in
door module and the electrical back-up immersion heaters.
If the safety thermostat is tripped:
1. Cut off the mains supply to the indoor module and the electrical
back-up immersion heaters.
2. Remove the front panel from the indoor module.
Caution
Locate and correct the cause of power cut before resetting the
safety thermostat.
3. Using a flat screwdriver, push in the reset button 1 located on the
thermostat.
4. Put the front panel from the indoor module back in place.
5. Switch the mains supply to the indoor module and the electrical
back-up immersion heaters back on.
12.2 Error messages
Resetting the control panel allows the appliance to be restarted.
The message
appears when a fault code is detected. After resolving
the problem, pressing the
key resets the appliance's functions and
thus eradicates the fault.
If several faults occur, they are displayed one after the other.
1. Reset the control panel by pressing the
key for 3 seconds,
when an error message is displayed.
In economy mode, the appliance will not run a domestic hot water
heating cycle after a central heating cycle.
2. Display the current operating status by briefly pressing the
key.
12.2.1 Error codes
An error code is a temporary status, resulting from the detection of a heat
pump anomaly. The control panel attempts automatic restart of the heat
pump until it switches on.
When one of the following codes is displayed and the heat pump cannot
restart automatically, contact a maintenance technician.
Tab.73 List of temporary error codes
Error
code
Message
Description
H00.17
DHW sensor Closed
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.
Fig.126 Resetting the safety thermostat
MW-2000257-4
2
Fig.127
MW
-5
0
0
0
0
6
1
-3
Fig.128
MW-5000060-3
12 Troubleshooting
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