Dean D50 Installation, Operation & Maintenance Manual page 23

6.5.2 Built-in Filter Pump Fails to Pump Oil?
Filter pump
fails to pump
oil.
Press the filter
reset switch.
Turn pump
motor ON.
Does oil
flow?
Conduct
normal filter
operations.
CAUTION
If water gets into oil lines,
the water will cause
severe splattering when
reconnected to the filter.
Conduct
normal
filter
operations.
Turn pump motor
No OFF. Reset wall
circuit breaker (if
necessary).
Yes
Turn pump
motor ON.
Yes
Does oil
flow?
No
Contact your
Dean servicer.
Turn
pump ON.
Yes
Does oil
flow?
No
Does the pump
motor provide
suction?
No
Go to page 24 and
continue
troubleshooting.
Once shortening Submerge oil line into hot
has softened, water (over 49°C/120°F).
reconnect oil line Keep both ends out of the
to filter. water.
22
Yes There may be
blockages in the
oil lines
.
Go to page 23 and
follow procedures for
Rate of Oil Return
Slowing.
If blockage is not in
filter pan or line from
filter pan to the pump,
continue with this
flowchart procedure.
Disconnect oil
return line from the
pump to the fryer.
Can you blow
air through the
oil return line?
Pump motor is
clogged or faulty.
Contact your
Dean servicer.