ESP HT 12 KW, Инструкция по установке и эксплуатации, Страница: 34 / 52

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3. Check that the vents on the back of the unit and the evaporator
have not become blocked, thereby impeding the air flow through the
unit.
4. Check the unit has not entered in to defrost mode (the DEFROST
symbol will appear above the temperature display and flash). Should
this occur, the heat output from the unit will be diverted to the
evaporator until any ice build up has been removed from the
evaporator. When in defrost mode the system water temperature will
fall and the lower system temperature will show on the unit
controller.
5. If you hear water “gurgling” in the unit, most of the time this will
not be a problem and is just the normal movement of refrigerant in
the unit. In exceptional circumstances, it could mean that you have
air in the water system that is likely to be cleared by the auto air-
bleeding vents on the system pipework. If it persists, it could indicate
that there is a leak in the water system that needs attention. Check
the system pressure to see if it has fallen. If it has, call your service
engineer/plumber.
6. If there is power to the unit and the programmer is calling for
heat, but the unit is not running, it could be that one of the safety
cut-out facilities has operated. This can take several minutes to clear
before the unit restarts.
You can also refer to the table in section 5 for more detailed fault
finding. If ever in doubt, or if you are concerned in any way, call your
service engineer/plumber and discuss the problems that you are
having. If you cannot contact your service engineer/plumber, please
call ESP for assistance.