SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

If you just try to run one station manually does it work?
First thing I would do is a controller reset. Look on page 21 of the controller manual

GatorGuy, thanks for your reply. I tried running one station manually and it did not work. Same thing. It tried to start and then immediately goes to displaying time. I hear a thump sound at my tankless water heater. Few drops of water is coming out of the tankless from the open pipe on the bottom. I did not try the reset. I will do it today. Thanks

-SP

Check for a short circuit.

Thanks GatorGuy & Web_Boots. After I posted this, it worked couple of times. And then back to the same problem again.

I tried to reset the controller. Also tried Run (Bypass Sensor). Same thing. The first time I try it, it looks like the sprinkler come up a bit and water start flowing, but then immediately stops. I hear a click at the tankless water heater and it spills out a few drops of water from the open pipe. I tried single station, all stations, manual, Run, Run (Bypass Sensor)... I checked the voltage from the transformer. 24V. I also checked voltage between Common and the zone wire's. It also looks good. I opened the cover to the Solenoid valves. Don't see anything visibly broken/disconnected. I haven't checked the voltage at the Solenoid's. There is not water seeping out from anywhere in the lawn.

Thanks for your help
-S

I don't have any experience with tankless waterheaters and don't understand your comment about water spilling out the open pipe.
Is this supposed to happen?

Water boiler leaking is about the most usual conditions regarding clients of boilers, and then, when the hot water heater might be dripping, that will certainly destroy the household just a little outflow is not tolerable.