Optima Company 600 - 1700 - Manual (Page 34)

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Possible cause 3: The underfl oor heating or radiator valves are
closed.
Action: 1. Open the valves.
Possible cause 4: The fl ow across the heat pump is greater than
the fl ow in the heating system.
Action: 1. Reduce the speed of the heat carrier pump (see
Tripped high pressure switch ) or increase the speed
of the circulation pump for the heating system.
Contact your dealer for help.
Additional heat is now working at its highest
permitted temperature
There is a sensor T9 in the heat pump, which for reasons of safety, stops the
compressor and limits the additional heat to the heat pump if the tempera-
ture of the return water from the heating system becomes too high. The
limit for additional heat lies at approximately 48ºC.
Possible cause 1: The heat setting is set so high that the heating
system’s return temperature is too high.
Action: 1. Reduce the heat curve setting.
Heat carrier pump
(290 A/W) Circulation pump
for the heating
system (290 A/W)
What to do if a fault occurs