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Page 46 Portable Hot Oil Temperature Control Units
Troubleshooting Cont’d.
Condition Possible cause Solution
Controller heater output open.
Check the heater output with an
ohmmeter to ground. It should
read in the mega-ohm range.
Infinite or zero readings indicate
a defective output.
Unit does not heat.
(cont’d.)
Clogged Y strainer. Clean Y strainer.
Water supply to unit is turned
OFF.
Open water supply.
Water drain is plugged or
excessive back pressure in drain
line.
Clear drain line or eliminate
back pressure condition.
Heat exchanger tubes plugged
by lime deposits.
Remove tube bundles; clean/
replace as required.
Unit overheats/unable to cool.
Faulty solenoid valve.
Test solenoid valve by switching
to Manual Cool mode and listen
for valve operation. Replace if
faulty.
Leaks in connecting lines.
Inspect/replace faulty line or
connection.
Air in circulating lines.
Perform venting sequence in
Section 4-1 on Pages 27-29.
Low fluid.
Check fluid level in sight glass.
Add fluid if required.
Defective Ful-Flo valve. Replace Ful-Flo valve.
Water in fluid.
Drain water from low point in
piping (Section 4-1 on Pages
27-29), 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 (Section 4-1 on Pages
27-29), or boil water off.
Noisy pump.
Severely degraded fluid.
Drain and flush system. Replace
fluid.