Control Display Is Flashing -
If the control is flashing all of its lights, it
is likely that you have a grounding issue with the power source. Verify
that the unit is properly grounded.
Check to see if the compressor run indicator is on, calling for
cooling.
Display Current Supply Air
Temperature
Supply Air Temperature – Press & Hold Down (Defrost) immediately
followed by Up (Power) – You must keep them both held to see the
temperature.
Display Set Point
Check Set Point Temperature; it # 1 is the warmest and # 9 is the
coldest – set
typically between 4 & 5 – adjust accordingly – control has a minimum
run time of 5 minutes and a maximum run of 75 minutes.
Defrost Mode
Is the unit entering into defrost too often, or staying in defrost to
long? Our cases typically defrost every 6 to 8 hours as long as the
evaporator sensor is below defrost termination temperature of
approximately 43°F. There is also a defrost on demand feature that
can supersede the normal defrost interval as needed. (30 minute
maximum defrost duration as well as a 30 minute minimum
between defrosts)
Freezing Product
Adjust temperature control to a warmer set point. (1= Warmest 9=
Coldest)
For electronic control only, verify 10KOhm NTC sensor is reading
properly.
Check that superheat is between 8°F to 12°F
.
Product Load
should also be a minimum of an inch off of back wall to
allow supply air to circulate and not freeze product at the back wall.
Some items may need more clearance
if they are sensitive to freezing, as supply air temperature needs to get
below freezing.
Warm Product
Adjust temperature control to a colder set point. (1= Warmest 9=
Coldest)
For electronic control only, verify 10KOhm NTC sensor is reading
properly.
Check that the condenser air inlet and condenser air outlet are not
restricted.
Check that all evaporator fan motors and blades are working as they
should.
Check that the condenser fan motor and blade are working as they
should.
Check that the evaporator is clear and not obstructed with ice or debris
Check TXV bulb installation is secure and insulated.
Check that superheat is between 8°F to 12°F
.
If equipped, check sight glass for flashing and/or low charge.
See Defrost Mode
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