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Starting Member


Monday, August 13th 2018, 9:05am

Toro TMC 212 Controller Mv error message

I have a Toro TMC 212 controller with an Irritroll rain sensor. I am getting a flashing message "Mv" on the controller screen which is preventing the sprinklers to come on. In manual mode, I can get them to work after a few tries. It has been sporadic but is happening more often lately.

Not sure if this is a controller issue or the master valve. Where do I start?


Monday, August 13th 2018, 12:02pm

Years ago when we used those controllers at a company I worked for, we had that issue often. But ONLY for a pump start relay or older master valve. The TMC 212 had issues providing enough juice to the valve (I.e. Zone #1) AND the PSR or MV. Do you have either on your system?


Starting Member


Sunday, October 23rd 2022, 8:03am

My Toro TMC212 has an error message MV and will not run normally or on manual.

My system will not run on the normal schedule or manual. Is it a control problem or valve problem and is there a simple fix?

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