Hitachi YUTAKI Series - Incidents of Operation

Troubleshooting
Service Manual
174
Incidents of operation
SMGB0066 rev.0 - 12/2009
 
The operation of the heater is bonded to the Yutaki heat pump.
(Ifthatisindefault,theheatercanbeactivatedonlyifspecicprogrammingcontrollerYutakiisdone).Theheatercanbe
activated by the controller Yutaki under request for additional power or temperature.
In case of non-functioning heater should check:
- That signals to the heat pump function.
- That fuse protection heater in a state.
- That the water pressure is at least 1 bar.
- Thatthewaterowisassuredpermanently.
If the above checks are correct:
- Turn off the heater isolating fuses.
- Open the hood of connecting the heater.
- Check the good son tightening supply and command.
Pressrmlyonthepushrearmamentsecurityheatbetweenthe2relayselectricalpowertorearmsecurityheat.(Itis
possiblethatsafetyheaterthermalbetriggeredduetoastoppageofwaterow).
- Close the door connecting the heater.
- Switch on the power and restart the heat pump.
Incaseofnon-functioningheater,removetheheateranddemanditsreplacement.