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INSTALLATION
Troubleshooting
13. Troubleshooting
WARNING Electrocution
Isolate the appliance from the power supply when
carrying out any work.
13.1 Fault display
Faults in the system or in the heat pump are indicated on the
display. For heating system and heat pump troubleshooting and
analysis, all important process data and BUS subscribers can be
called up under DIAGNOSIS and a relay test can be carried out.
For troubleshooting, analyse all available parameters before
opening the heat pump control panel.
Whenever a fault occurs (except with hot gas) the heat pump
switches off, the red LED on the IWS flashes for approx. 12 min-
utes, the idle time is set and the corresponding fault is written
to the fault list.
Once the fault time on the IWS and the idle time have elapsed, the
heat pump restarts. Even if the heat pump has already been reset
and the flashing red LED on the IWS has gone out, the heat pump
will not restart until the idle time has elapsed.
On all heat pump types, the fault inputs on the IWS are negated,
in other words, 230 V is always present at the fault inputs in
standard mode.
When the heat pump has been shut down (controlled shutdown)
and after a period of 10s, the 230V signal must be present. If
this is not the case, the red LED on the IWS flashes and CENTRAL
FAULT is displayed.
Note
Such faults are written to the fault list, and the system
is switched off. The display message will extinguish 10
min after the fault has been removed. The system will
be shut down permanently if 5 heat pump-specific or
hardware faults occur within 2 hours run. Under these
circumstances, you can only restart the heat pump after
the fault has been removed and the IWS has been reset.
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