intercom::waiterror

I have a problem connecting my extruder controller. Everything seems to be ok, until I start ./reprap. I get a lot of:
comms: G-code: N324 M105 *2 dequeued and sent [271.352s/1502ms]
comms: Response: ok T:0 B:0 intercom::waitError() [271.439s/87ms]
comms: G-code: N325 M105 *3 dequeued and sent [271.440s/1ms]
comms: Response: ok T:0 B:0 intercom::queueError() [271.498s/58ms]
comms: G-code: N326 M105 *0 dequeued and sent [273.001s/1503ms]
comms: Response: ok T:0 B:0 intercom::waitError() [273.089s/88ms]
comms: G-code: N327 M105 *1 dequeued and sent [273.090s/1ms]
comms: Response: ok T:0 B:0 intercom::waitError() [273.178s/88ms]

As I am able to switch the heater on from the interface ( the led next to the mosfet goes on) , I assume the extruder is not able to talk back to the mainboard. This seems weird. What can I do?

What electronics do you have?
Is SDA/SDL connected to D9/D10?
It may be necessary to ground the motherboard to the extruder controller if they don't share a good ground connection from before.

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-Nudel
Blog with RepRap Comic

I have gen3 electronics

I tried it with sda/sdl connected, no difference. Although I don't understand why I need I2C for an extruder.

The grounding is something I will try. I have debugged to the point where the extruder controller blinks when it's reading it's output, but the motherboard isn't receiving it.

I grounded my mainboard to the extruder, no difference

if I ground pin2 on the SN75176A on the Motherboard I get:
comms: G-code: N260 M105 *3 dequeued and sent [182.768s/1ms]
comms: Response: ok T:23 B:-16 [182.788s/20ms]
comms: G-code: N261 M105 *2 dequeued and sent [184.290s/1502ms]
comms: Response: ok T:23 B:-16 [184.311s/21ms]
comms: G-code: N262 M105 *1 dequeued and sent [184.312s/1ms]
comms: Response: ok T:23 B:-16 [184.332s/20ms]

Which looks a lot better

Success!

The problem was pin 2, which failed to make contact. Adding a lot of extra solder fixed the problem.

I still like to know why I would need the SDA/SCL connection...

They are the step and direction signals for the extruder, mad I know, but that's the way it is.

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[www.hydraraptor.blogspot.com]

I'm seeing the exact same thing. What chip did you resolder pin 2 on?

In the SN75176A of the extruder board. It's a small chip with 8 pin's, used for communication between the extruder an mainboard. There is also a SN75176A on the mainboard.

What I did is pressing gently with a screwdriver on the different pins. By pressing on pin 2 I found the contact was loose. So you might want to try that on both the extruder and the mainboard.