17
Section 7 – Troubleshooting
Troubleshooting Guide - For qualified personnel only. See warnings in earlier sections.
Symptom
Probable Cause
Correction
Unit will not start, control
display does not light.
1. Unit not wired correctly.
1. Check wiring.
2. Disconnect switch OFF.
2. Turn disconnect ON.
3. Blown fuse.
3. Check customer disconnect fuses and
120V fuse on terminal block (blown fuse indi-
cator will light if fuse is blown).
4. Wrong voltage.
4. Check supply voltage & unit’s rated voltage.
Control display lights, unit
will not start
1. Cooling water off, or below 20
psi. (CMX-250 models only)
1. Open cooling water valve, check to assure
pressure is above 30psi
2. Pump Motor Overload
2. Determine problem and press pump reset.
3. System above temperature
limit of 260°F. (190˚F on CMX-
180 Models)
3. Allow unit to cool below 260°F and press
RESET
.
Unit stops while running
1. Cooling water drops below 20
psi
1. Check cooling water valve, check to as-
sure above 30 psi
2. Pump motor overload
2. Determine problem and press pump reset.
3. System exceeds temperature
limit of 260˚F (190˚F on CMX-180
Models)
3. Allow unit to cool below 260°F and press
RESET
.
Low Water Pressure
Indicator Illuminated
1. Cooling water drops below 20
psi (CMX-180 models)
1. Check that pressure is above 30 psi
Pump Overload Indicator
illuminated
1. Pump motor overload
1. Determine the problem and press pump
reset button
Over Temperature
Indicator illuminated
1. System above temperature
limit of 600°F.
1. Allow unit to cool below 550°F and press
reset on over temperature controller inside
the panel. See Section 5.
Unit runs but fails to
pump.
1. Incoming phase reversed on
pump motor.
1. Swap any two legs on the incoming power.
Unit will not heat to
setpoint.
1. Cooling valve stuck open.
1. Check for cooling water flow during heat
cycle.
2. Heater element failure.
2. Check current at heater contactor during
heating.
3. Heater output insufficient.
3. Excessive losses in process or incorrectly
sized unit for application.
4. Controller needs to be tuned.
4. Check factory MENU settings, Section 3 of
this manual. Refer to 2104 Controller Techni-
cal Manual, page 35, for further information.
Unit will not cool to
setpoint.
1. Inadequate cooling water flow. 1. Open cooling water supply line more and
assure adequate pressure.
2. Cooling outlet obstructed.
2. Check cooling outlet for obstructions
3. Heater contactor fused
closed.
3. Check voltage across contactor during
cooling cycle.
4. Controller needs to be tuned.
4. Check factory MENU settings, Section 3 of
this manual. Refer to 2104 Controller Techni-
cal manual, page 35, for further information.
If you continue to have problems with the system after review of the above issues, please contact Chromalox
Product Service at 800-443-2640.
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com