TC 120
682.98767.00 • 10/04/2018
41
Low pump
pressure.
Pump running in reverse.
Verify proper rotation. If not
clockwise, reverse any two
incoming power leads.
Foreign matter in the system.
Clean the system.
System has minimal back
pressure, and is operating at
the far end of the pump curve.
As long as there is satisfactory
process temperature control there
is no problem.
High pump
pressure.
Foreign matter obstructing
system.
Clean the system.
Restricted water flow.
Check for closed valves etc. Be
sure all lines are properly sized.
System has high back
pressure, and is operating at
the near end of the pump
curve; a low flow condition.
As long as there is satisfactory
process temperature control there
is no problem.
Pressure switch
circuit is open.
Insufficient cooling or makeup
water pressure.
Check for 25 psig (172 kPa/1.7
bar) water pressure on Water In or
City Water MakeUp.
Switch is broken.
Jump power across switch and see
if unit starts. Replace switch if
needed.
Temperature
fluctuations/ rapid
cycling from hot to
cold.
Undersized connectors/ water
lines.
Increase size of connectors/ water
lines.
Long connecting lines between
unit and mold.
Move the unit closer to the mold
and shorten connecting lines.
Serpentine flow through mold.
Connect lines for parallel flow
instead of series flow.
Blocked water line in mold.
Check mold for metal chips or
lime buildup. Clean mold.
Quick disconnect fitting with
check valve.
Remove and replace fitting or
valve.
Lime buildup in unit piping.
Clean or replace.
Faulty TCU.
Check unit by connecting ¾” line
directly from delivery to return
line. Run unit to determine if TCU
controls set point temperature.
Unit overheats or
does not cool.
Drain is plugged or excessive
back pressure is in drain line.
Clear drain line or eliminate back
pressure condition.
Faulty solenoid valve.
Test solenoid valve by pressing
VENT button and listen for valve
operation. Replace if faulty.
Controller Cool output relay
open.
Replace output relay.
Solenoid valve is not
operating, but COOL LED is
on.
Set process temperature to
minimum and check for
magnetism on solenoid coil top.
Solenoid coil circuit is open.
Check coil resistance. If M
range, replace solenoid coil.