We have a problem with our sprinkler system that we’ve tried to
resolve through our local Irritrol dealer with no success. We’ve
reviewed past postings, but have not found anything that addresses our
First, to describe our system: All 4 valves are controlled via an
Orbit timer that is short of 2 years since being replaced and was
working fine before this problem began. It seems to work OK on the
timed system, except for zones 3 & 4, which is why we think this is a
valve control problem, rather than a problem with the timer system.
We have 4 of the 205TF valves, with 3 in one box, and the other in a
single box. The latter valve, which controls Zone 1, operates with no
problems. In the other box, the drip system valve (Zone 2) operates
OK. The other 2 valves, that control the rest of our lawn sprinklers
(Zones 3 and 4), are where the problem lies. These valves work fine
if the bleed screw is opened, but do not work when activated through
the automatic or manual option on the Orbit timer. This would seem to
imply that the problem lies with the timer, but as noted above, it
works OK for Zones 1 and 2, and the Orbit manual does not have any
Troubleshooting tips for separate zone failures.
We replaced the diaphragms on all 3 of the valves in the control box
in question and tested all of the solenoids (which were all OK). When
that failed to solve the problem, we purchased a Cover Diaphragm
Assembly Kit (R205TFKIT) to see if there was some kind of a blockage
on the inlet side of the valve. We’ve also replaced the wiring from
the timer box to each of the control valves. That too failed to solve
the problem which is why we are asking for your advice.
So, our question is: What else can we do to figure-out a fix for this
Thanks for your advice.