I have set up my Inkbird IIC-800-WiFi and connected the Master Valve to a relay to run my pump. The pump turns on as soon as the Inkbird unit is powered. I have checked the Master Valve connection and it outputs 24v even if all the zones are off. Have I got faulty unit?
(The relay works fine, if I connect a 24V supply through a switch the relay and pump switch on and off as expected)
I have just read the manual and it seems to fall short of explaining that the M controller connection is active when the InkBird controller is in the ON state.
I have tested its function and confirm the above.
Contrary to my previous understanding and exception which would be for the M output to only be active when a Zone is active.
Hello,
Just to confirm, is the pump relay input you are using 24VAC? Please understand it cannot be 24VDC.
Please check if the wiring is correct?
Dear Tanya,
Yes the pump relay is 24VAC. And the connections are according to the diagram. “M” outputs 24V constantly and triggers the relay so the pump is on all the time ever when no zones are on.
I consulted the engineers, they replied that the pump (port M) will always remain on as long as the IIC-800-WIFI is powered on.
Sorry for the confusion.
How then does the IIC-800-WiFi control the switching on and off of the pump? You are saying that the pump must be on always? 
Sorry, there may be a little communication problem between me and the engineer 
. I can now confirm that when all zones of IIC-800-WIFI are turned off, the main valve will also be off. To check the status of the ports, perhaps you could remove the wiring to the main valve, but leave the wiring (#C and #M) to the pump relay.
Wiring reference:
When all zones of IIC-800-WIFI are off, does the pump still on?
When all zones are off there is still 24VAC from C and M. This happens when the power cord from the transformer is connected to the unit, even if the unit is off.
Is it possible to provide order information and a video (showing the wiring and the problem) to email support@inkbird.com?
This can help engineers check if there are any overlooked details and provide after-sales service.
Since forum posts are public, these may involve private information, please do not reply here.
Thanks.
See attached video please.
(Attachment IIC-800-WiFi.mp4 is missing)
I have replied before but have undertaken further testing with the new knowledge that there must be a suitable 24 VAC load across M&C eg Relay or Globe to test. The 24 VAC globe (200mA) only activated when a Zone (any Zone) was active. Which is the exact requirement to support a pump or master valve activation for watering.
This has confirmed my understanding of the manual instructions.
