Vulcan-Hart GR Series Service Manual page 55

GR Series Gas Fryers with NCC Controls (formerly Tridelta / Built after 3/05) - TROUBLESHOOTING
Symptom
Shortening not filtering, pump motor is on.
Shortening not discarding, pump motor is on.
Pump motor is not running to circulate
shortening through filtering system, display is
lit.
KLEENSCREEN FILTERING SYSTEM
1. Filter screen is plugged.
2. Clog in filter system lines.
NOTE: If using solid shortening, when all filtered shortening is
returned to the fry tank and filter power switch is off, open the
filter drawer approximately 1 inch. Allow the remaining
shortening in the line to drain into the filter tank to prevent
possible clogging after the shortening cools and solidifies. Close
the filter drawer when complete.
3. Shortening below 300°F too thick.
4. R2 fill relay malfunction (N.C. contacts are open).
5. Fill solenoid valve malfunction.
6. Interconnecting wiring malfunction.
7. Pump is inoperative.
1. Filter screen plugged.
2. Clog in filter system lines.
NOTE: If using solid shortening, when all filtered shortening is
returned to the fry tank and filter power switch is off, open the
filter drawer approximately 1 inch. Allow the remaining
shortening in the line to drain into the filter tank to prevent
possible clogging after the shortening cools and solidifies. Close
the filter drawer when complete.
3. Shortening below 300°F too thick.
4. Discard valve switch malfunction (N.O. contacts not closing to
energize R2 relay coil).
5. R2 fill relay malfunction (contacts remain closed).
NOTE: The fill solenoid valve should not be energized during
discard operation so that shortening will flow through manual
discard valve only.
6. Discard valve mechanical malfunction.
7. Discard hose connection not fully engaged.
8. Pump is inoperative.
1. Filter key on control panel not pressed or held in long enough
to start pump motor (default is 3 sec.).
2. R1 pump motor relay malfunction.
3. Cooking control malfunction.
4. Interface board malfunction.
5. Interconnecting wiring malfunction.
6. Pump motor inoperative.
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Possible Causes
F35660 Rev. A (0717)