6-10 TROUBLESHOOTING
Thermolator TW Series UGH025-0504
Alarm
The cooling water
pressure is less than
25 psi.
Note: The unit will
re-start automatically
after a two-second
delay if the water
pressure returns to at
least 25 psi.
The pump motor
overload has
tripped. The
contact is open.
WARNING:
Only qualified electrical
service personnel
should examine and
correct problems that
require opening the
unit's electrical
enclosure or checking
electrical current to
diagnose the cause of
a problem.
Possible cause
The water supply pres-
sure is below 25 psi.
The pressure switch
failed.
The cooling valve failed.
The incorrect voltage is
supplied to the pump
motor.
The required water flow
is greater than the
pump’s capacity.
The motor overload is
faulty or set incorrectly.
The pump is not working
properly.
Solution
Verify that the water supply is on
and delivering water at a pressure of
at least 25 psi. Check for closed
valve or faulty pump in the supply
circuit.
Watch gauges while turning cooling
water on and off. If pressure vents
automatically, check vent or cooling
valve.
Check the cooling valve. See
Repairing Solenoid Valves or
Motorized Cooling Valves, Section 6.
Supply voltage should match the rat-
ing on the pump name plate. If volt-
age is correct, check wiring connec-
tions.
r
Review pump sizing for the appli-
cation.
r
Decrease the process water flow.
Disconnect the power and open the
electrical enclosure. Verify that the
overload is set to trip at the proper
amperage, which should not exceed
the FLA. Manually trip and reset the
overload. If the problem continues,
replace the overload. See Resetting
and Replacing Overloads, Section 6.
Replace the pump if supply voltage,
wiring and overload settings are cor-
rect, but the pump continues to draw
excessive current.
The Thermolator has detected a problem that could lead to equip-
ment damage or personal injury if it is not corrected.
u The Alarm LED lights and the STOP/RUN LED flashes red.
u The Thermolator automatically shuts down.
u The control displays a red LED or alarm code indicating the
source of the problem.
Low Water Pressure
Pump
TW-1, TW-2
C
ONTROL
SHUT
DOWN ALARMS
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