TC110 Series
Water Temperature Control Units 882.03888.00
•
09/19/2018
40
5-2
Troubleshooting Problem-Solution chart
Problem
Possible cause
Solution
Unit does not turn on.
No power.
Check main disconnect, fuses,
wiring, and power lead to unit.
Wrong voltage supplied to unit.
Voltage must be within plus or
minus 10% of nameplate rating.
Defective on/off switch.
Replace.
Control circuit fuse blown.
Replace.
Defective control transformer.
Check transformer.
Unit does not run.
Broken or loose wire in pump
motor control circuit.
Locate and repair.
Pump motor contactor holding coil
is open.
Repair or replace.
Low water pressure light on.
Check for at least 16 psig (110
kPa/1.1 bar) water pressure on
WATER IN.
Water supply to unit is turned off.
Open water supply.
Pump overload light on.
Reset and test each leg for
balanced amp draws.
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.
Switch is broken.
Jump power across switch and see
if unit starts. Replace switch if
needed.
