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Troubleshooting 8
0020147164_04 aroTHERM Installation instructions 27
Note
If necessary, you can drain the heating
installation using this drain cock by opening
the stop valves on the back of the heat
pump.
7.7 Checking the product's status codes
Menu Live Monitor
You can check the product's status codes at any time to see
which operating condition the heat pump is in. You can read
these codes on the display of the heat pump control module
or hydraulic station VWZ MEH 61.
7.8 Checking the electrical installation
Check the electrical installation and take all relevant dir-
ectives into account.
Checking the cable
If the product's mains power cable is damaged, then, in order
to avoid danger, only the manufacturer, the Customer Ser-
vice team or a similarly qualified person should replace the
mains power cable.
To replace the mains power cable, see Carrying out the
electrical installation ( Page 17).
7.9 Start-up following maintenance
1. After the maintenance work has been completed, start
up the product see Start-up ( Page 21).
2. If you have carried out work on load-bearing parts,
check that they are securely fitted.
3. When you have completed work on the product, carry
out an operational and safety test.
8 Troubleshooting
8.1 Troubleshooting
You should carry out the following tests before introducing
additional steps:
Make absolutely sure that the power supply was not cut
and that the product is correctly connected.
Ensure that the service valves are open.
Check that all external controllers are correctly connec-
ted.
8.2 Fault codes
The fault codes are described in a table in the Appendix.
Fault codes ( Page 48)
In the event of a fault, a fault code number is shown in the
controller's display.
Carry out all necessary repairs.
Switch the product on/off using the partition.
8.3 Carrying out the actuator test
Menu Installer level Test menu Sensor/actuator
test
You can check that the components of the heating installa-
tion are functioning correctly using the sensor/actuator test.
Display Test programme
T.0.01 Heating pump power
T.0.05 Fan power
T.0.07 4-way valve (circuits for thawing are not counted)
T.0.08 Position of the electronic expansion valve
T.0.09 Heating coil compressor
T.0.13 Flow temperature
T.0.14 Return temperature
T.0.15 Heating circuit pressure
T.0.16 Heating circuit flow rate
T.0.17 Lockout contact S20
T.0.66 Air inlet temperature
T.0.26 Compressor outlet temperature
T.0.27 Compressor inlet temperature
T.0.29 Heat exchanger temperature
T.0.30 High pressure
T.0.31 Condensation temperature
T.0.33 Evaporation temperature
T.0.34 Superheating target value
T.0.35 Superheating actual value
T.0.36 Subcooling actual value
T.1.37 Outside temperature
T.1.38 DCF status
T.1.59 Multi-function output 1
T.1.60 Multi-function output 2
T.1.61 Diverter valve 1
T.1.62 Flow sensor
T.1.63 Cylinder sensor
T.1.64 Multi-function input
T.1.65 Energy supply company input
T.1.66 Inlet temperature
T.1.67 High-pressure switch
T.1.68 Compressor rotational speed
T.1.69 Condensate pan heating
T.1.15 Water pressure
27


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