Error 11 – Check Pump Relay
Explanation of a REAL
error
11
– the SR500 is equipped with 2 redundant relays
that swap places every time the unit starts the pump or energizes a contactor coil. If
one of the two relays fuses closed it would make it impossible to stop the pump, so a
switching/checking program is employed to prevent this from occurring.
Checking the r
elays – disconnect all lines in and out of the unit (line 1 and 2, load 1
and 2) and check across line 1 and load 1, and then across line 2 and load 2, with an
ohmmeter or diode-checking circuit on a multimeter. Continuity across either
line1/load1 or line2/load2 indicates that the relay is fused closed. If the relays are
open, there will be no continuity across line1/load1 or line2/load2. The relays should
be open when there is no power applied to the unit.
It is much more common to electrically reproduce an Error 11 than to actually have a
real one. 99% of the time this will occur on systems using 115 volt input power.
1- The most common culprit is the panel where the breaker supplying the SR500 is
located. If the neutral buss and ground buss are not connected in the electrical service
panel, the relays will not switch properly, and error 11 will occur on the second start-
up. (it will start properly once. The second time it will start on the same relay as the
first time, and error 11 will occur)
2- Also a culprit but less common (depends on the “creativity” of the electrician
installing the unit) is Load 2 being left open (or not used) and the neutral from the
motor running straight back to the electrical service panel. This will have the same
effect; it will prevent the relays from switching properly, and the unit will show error
11 on the second startup. Both loads must be wired to both terminals of the motor or
contactor coil.
Residual vacuum left on the system after the pump has stopped can also reproduce or
“fake” an error 11, however this is a rare occurrence. If the SR500 senses that the vac-
uum is already at running level upon pump startup, it is only smart enough to assume
that the pump is already running even though it just started. It will take this to indi-
cate a fused relay and give error 11.
If the real-time stopped vacuum is raised due to changing water level in the hose or
mis-calibration, it can also “fake” an error 11. Also a very rare occurrence.
System Err
or 17 – Delta P off reference
Error 17- Delta P off reference – occurs when the SR500 sees a real-time vacuum
measurement upon starting that is outside of its acceptable starting “window” set in
the memory. If this occurs on a newly installed unit, this is usually due to improper
calibration. Run the “Prime Pump” function again in Service Mode, insuring the
pump is running at full prime and filter pressure and flow rates are normal before
pressing “yes” to stop and save.
Err
or 17 on units that have performed properly for a set period of time – these
systems have experienced a change in operating vacuum that has strayed from the
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