User's Manual

TROUBLESHOOTING AND SERVICE GUIDE:
The following is intended as a quick service guide designed to diagnose most common problems. It is
intended to be used only as a guideline. Should the unit require actual replacement of components those
must be done by a trained and licensed refrigeration professional. While the unit is within the factory
warranty period, all repairs require prior factory authorization before the work is actually performed.
UNIT NOT COOLING:
• POWER TO THE UNIT: Is there power to the unit?. Is the voltage within ± 10% of 115 VAC? Low
power conditions affect the amperage draw of the compressor, requiring more amperes on start up. If
the amperage draw is too high, the compressor safety relay could trip leading to component prema-
ture failure. if the compressor is tripping on it’s safety relay on startups, the unit will not refrigerate as
required.
• COMPRESSOR NOT RUNNING: Is the compressor not running when the controller calls for cooling
to begin?. (see point above). Verify that power to the compressor is correct and the starter and safety
relays are working properly.
• CONDENSR FAN NOT RUNNING: Is the compressor running but not the condenser fan? The con-
denser fan is on the same circuit as the compressor. They both operate at the same time. Verify that
the condenser fan receives power and the fan blades rotate freely. Verify if there is debris in the
blades that prevents it from starting (ie: leaves, paper, grass clippings, etc…)
• VENTILATION IN THE UNIT: Does the unit have enough ventilation on the back to allow for free cool
air to reach the condenser? Many installations have no outside ventilation reaching the condenser as
they place the unit into a closed space that only re-circulates air discharged from the condenser
“back” to the condenser reducing performance drastically. Verify that there is an outside source for
fresh air into the condenser.
NOT HOLDING TEMPERATURE CORRECTLY:
• CONTROL SET POINT: Is the unit operating with the correct set point? Please verify according to
the list provided in the controller programming on the following chapter of this booklet.
• OPERATING DIFFERENTIAL: The unit operates in a 3 degree differential on average depending on
the quantity of items in the unit. The unit will cycle ON and OFF several times so the product tem-
perature is an average of the cycle. (see section “Understanding the refrigeration cycle”)
• DEFROST MODE: Is the unit currently in defrost mode?. The unit defrosts until the coil temperature
reaches 50°F. This is not the temperature of the product, this is just the air temperature during de-
frost.