Code
Description
Checking / solution
The impressed current anode is in short circuit.
Check that the connection cable between the
PCU PCB and the anode is not in short circuit.
Check that the anode is not in short circuit.
Remarks:
Production of domestic hot water is stopped but
may be restarted by pressing the reset key (for
72 hours).
Protection against corrosion is not assured.
LP pressure switch alarm.
Note: Domestic hot water production is assured by
the back-up, if the back-up is authorised.
Check the compressor power supply.
Check the pressure switch connection.
The room temperature is less than 5°C.
Note: Domestic hot water production is assured by
the back-up, if the back-up is authorised.
Modify the following parameters in line with the
recommendations in the manual.
The compressor will assure production of do
mestic hot water once the room temperature ex
ceeds 5°C.
The room temperature is above 35°C. The com
pressor is outside of its operating range.
Note: Domestic hot water production is assured by
the back-up, if the back-up is authorised.
Modify the following parameters in line with the
recommendations in the manual.
The compressor will assure production of do
mestic hot water once the room temperature is
below 35°C.
The maximum operating time for the compressor is
exceeded.
Wait one hour, after which the compressor will re
start on request.
Air pressure switch open.
Bad connection
Check that the sensor is correctly connected.
Check the connection and the connectors.
Check that the corresponding sensor is correctly
fitted.
Defective sensor
Replace the sensor if necessary.
Air pressure switch in short circuit.
Bad connection
Check that the sensor is correctly connected.
Check the connection and the connectors.
Check that the corresponding sensor is correctly
fitted.
Defective sensor
Replace the sensor if necessary.
Very low air pressure within the installation.
Note: Domestic hot water production is assured by
the back-up, if the back-up is authorised
Check that the fan is operating correctly.
Check the condition of the filter.
The room temperature sensor is in short circuit
Note: Domestic hot water production is ensured by
the back-up, if the back-up is authorised
Bad connection
Check whether the sensor is connected
Check the link and the connectors
Check that the sensor has been correctly fitted
Sensor failure
Check the Ohmic value of the sensor
Replace the sensor if necessary
The room temperature sensor is open
Note: Domestic hot water production is ensured by
the back-up, if the back-up is authorised
Bad connection
Check whether the sensor is connected
Check the link and the connectors
Check that the sensor has been correctly fitted
Sensor failure
Check the Ohmic value of the sensor
Replace the sensor if necessary
Low air pressure within the installation.
Check that the fan is operating correctly.
Check the condition of the filter.
9 Troubleshooting
EN-7602142 - v11 - 24042019
TWH 200 EV
65