Worcester GREENSTORE Instruction Manual page 42

What to do if a fault occurs
Heat transfer fl uid out max T8 (GT8)
Sensor T8 (GT8) in the heat pump stops the compressor if the temperature
of the water going out to the heating system becomes too high.
Possible cause 1: Insuffi cient fl ow over the heat pump.
Action: 1. Check that the heating system pump has not
2. Check that all the valves are open. Radiator ther-
Possible cause 2: The fi lter on the primar y circuit is blocked.
Action: 1. Clean the fi lter.
Sensor fault
All sensors connected to the heat pump can give an alarm when defective. In the
example to the right it is sensor T1 (GT1), Return radiator, which has given an
alarm. All sensors give alarms in the same way. Read more about the sensors
under heading Read the temperatures on the heat pump.
Possible cause 1: Temporar y error.
Action: 1. Monitor performance of the heat pump.
Possible cause 2: Short circuit or broken sensor cable.
Action: 1. If you have a multimeter you can disconnect the sensor
Possible cause 3: Defective sensor or incorrect connection.
Action: 1. Replace sensor/check connection.
jammed.
mostat valves should be fully open and underfl oor
heating systems should have at least half of the
coils fully open.
and check the cable's resistance. Compare with the
sensor table in the section Technical information.
The heat pump starts automatically
when the alarm is reset and the water
temperature has dropped to its normal
value.
Switch off the power before checking
the resistance of the cable.
42
ALARM (GT8)
Heat tran fl uid out
060822 16:08:15
Info Ackn.
Note
ALARM (GT1)
Sensor return rad.
060822 16:08:15
Info Ackn.
Note