Fixing a 1 FUS Error on a Richdel 446PR Irrigation Controller
Summary
Replacing an old 9V battery in a Richdel 446PR sprinkler controller
can fix a variety of problems. Mine was not running or getting
stuck. Now it is back to normal after replacing the long-expired
battery with a fresh one.
Details
Recently my Richdel 446PR irrigation controller started acting up. It
was exhibiting the following problems:
Refusing to run the sprinklers, with a '1 FUS' message on the
display. The manual suggests this indicates a short in zone 1, but
that was misleading.
Zones stuck on. We had a zone get stuck on, but that hasn't
happened since.
After disconnecting various zones to no avail, I looked at the
battery. Its expiration date was 9 years ago! After replacing it,
the controller is back to normal.