Command SetCompressorState seemingly doesn't work

[krispek]

The commmand SetCompressorState doesn't work. At least, that's what I think.

My goal is to disable the internal heater as much as possible, at least for defrosts. The only reason that I would like to use the internal heater, is the sterilization mode. I make use of floor heating, which offers more than enough heat to defrost the heat pump.

Based on the manual, the commmand SetCompressorState might be able to do so. It looks like a software version of the setting Backup heater (Use/Do not use Backup heater) in the custom menu, and this forces the internal heater to be turned off while defrosting. However, it does not work in the way I expect it to work. The internal heater is still being used to defrost the heat pump.

What I do, is use the command SetCompressorState with the value 1. This does not result in any feedback whatsoever. This is expected, since the manual states There is NO pop up screen like External Switch when this External Compressor Switch is OFF.

There's a couple of possible explanations for this:

• This command does not affect the use of the internal heater for defrosting
• Somehow this command needs an additional argument (the manual mentions Dip switch Pin 3, which cannot be set afaik)
• Dip switch Pin 3 is set to off, which means that the heat source (that is the heat pump itself) should not work. I verified that this is not the case. :)

Did anybody else try to use the command SetCompressorState? And what can I expect from this command?

[geduxas]

This command is from expansion PCB, do you have one? Have you turned on PCB emuliation, also this requires to enable external PCB

[krispek]

Yes, I did this. Other commands (SetDemandControl) do work fine.