Worcester Greenstore Instruction Manual page 63

High Heat transfer fluid delta T8/T9 (GT8/GT9)
Possible cause 1: Not enough flow over the heat pump.
Possible cause 2: The filter on the primary circuit is blocked.
High return to the heat pump T9 (GT9)
Possible cause 1: The temperature setting is too high.
Possible cause 2: The valves on the radiators or underfloor
heating system are closed.
Possible cause 3: The hot water temperature is set too high.
Possible cause 4: The flow across the heat pump is greater than
the flow in the heating system.
Heat transfer fluid out max T8 (GT8)
Possible cause 1: Not enough flow over the heat pump.
Possible cause 2: The filter on the primary circuit is blocked.
Alarm GT8/GT9
High HTF delta
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Info Ackn.
Alarm (GT9)
High return HP
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Info Ackn.
Note
Lower the speed of the heat
carrier pump:
Alarm (GT8)
Heat tran. f out max
040622 16:08:15
Info Ackn.
Note