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Upright Portable Hot Oil TCUs Chapter 6: Troubleshooting 38
Problem Possible cause Corrective action
Leaks in connecting lines.
Inspect/replace faulty line or
connection.
Air in circulating lines.
Perform venting sequence in
Chapter 3.
Low fluid.
Check fluid level in sight glass.
Add fluid if required.
Defective Ful-Flo valve. See Chapter 3.
Water in fluid.
Drain water from low point in
piping (see Chapter 3), or boil
water off.
Vent solenoid open.
Allow vent timer to run out; or,
check valve operation when unit
is cold by opening the fill port.
Pump running in reverse.
Check motor; rewire if
necessary. See electrical
diagrams.
Pump repair/adjustment needed.
Adjust head spacing or replace
worn pump components.
Rapid drop in pressure/no
pressure.
V belt broken/worn. Replace as required.
Water in fluid.
Drain water from low point in
piping (see Chapter 3), or boil
water off.
Noisy pump.
Severely degraded fluid.
Drain and flush system. Replace
fluid.