Question
Hi there - I have an Irritrol RD-900 and my display simply says off.  If I switch
dials, or slide switch to off or run manually, it still says off.  The only thing that
works is the semi-auto button.  When pressed it operates, but display still says
off.  Thanks for any help:)  Mark

Answer
Hi Mark

Try the following:

Disconnect the flat cable in the back of the face plate, wait 1 minute a reconnect it. if not works:

turn off the power at the timer on the house circuit breaker for 1 minute and turn on. If not works: Replace the RD900

Regards
Guillermo