Service manual V1.0
Page
8
of 10
www.mcedsystems.com
5.
T
ROUBLESHOOTING
OBSERVATION
CAUSE
FIX
Compressor doesn’t start
Temperature controller or relay failure
(temperature controller housing)
Check the output voltage on each
components (2) and replace the
defective part
Relay, overload or start capacitor failure
(on the compressor)
Replace relay and/or overload and/or
start capacitor
Input voltage is too low
Check input voltage, refer to
specifications of the unit
Compressor failure
Replace compressor (Has to be
performed by a certified refrigeration
expert)
Compressor runs but
never reaches set point
Set point is too low
Adjust set point to a minimum of 27°F
Temperature probe is not properly
connected or installed
Temperature probe must be in the
bottom of the reservoir and in no
contact with any metallic part
Refrigerant leak
Perform a leak test and repair the leak.
Vacuum flush the refrigerant and fill
with proper quantity. (Has to be
performed by a certified refrigeration
expert)
Dirty condenser
Disconnect the unit. Clean the
condenser using degreaser and water.
Do not spill liquid on any electrical
component. Be careful to not damage
the aluminum fins of the condenser.
Dusty condenser
Disconnect the unit. Clean the
condenser with pressurized air.
Condenser fan malfunction
If the compressor runs but not the fan,
replace the fan motor.
Frozen glycol
Inadequate water/glycol mixture
Check mixture with a refractometer.
Mixture must be between 5°F and 20°F
Compressor never stops due to
malfunction of the temperature
controller
Check if temperature probe is properly
connected, if required replace
temperature controller
No outflow of the
circulation line
Circulation line blocked
Inspect and locate blockage. Clean the
lines.
Pump failure
Replace the pump
Damper coupling broken
Replace damper coupling
