I WARM 730 User And Installation Manual - Selfdiagnostics
Manual is about: Room Thermostat
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Selfdiagnostics
The thermostat controls constantly the working capacity
of the temperature sensors. In case any of them is out of
order (break or short circuit of leads takes place), the ther
mostat switches off heating of this zone and displays warn
ing messages (fig. 4). You should apply to the nearest serv
ice center for repair or changing the temperature sensor
(the addresses are given in the heating system installation
manual).
Fig. 4 Selfdiagnostics warning messages