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if you have an older firmware version then the setting "hysteresis" determines when the controller has full speed
-> decrease your hysteresis setting

did you check the jumper?

simple: there is a setting "1-10V is max at..." in the temp. section

there you enter the temperature deviation at which the 1-10V port is max.

described in manual

can be changed in...

2 ideas:
- the setting "1-10V is max at..." should be changed
- if the PropellerControl does not react at all: maybe a jumper inside it is not plugged correctly (both jumpers must have the same...