HUSSMANN CORPORATION • CHINO, CA 91710
27
Hot or Cold Food Counters
ISLA Food Counters IM-FS IM-FH IM-FR 10/20
Trouble Shooting Guide (Cold Case - Contd)
Problem
Possible Cause
Possible Solution
Case temperature is
too cold.
Suction pressure and/or
t-stat setting is too low.
Check factory spec sheet.
The t-stat temp is set too
low.
Check settings. See Technical Specifications section.
Ambient conditions may
be affecting the case
operation.
Check case position in store. Is the case located near an
open door, window, electric fan or air conditioning vent that
may cause air currents? Case must be located minimum
15 Ft away from doors or windows. Cases are designed to
operate at 55% Relative humidity and a temperature of 75°F.
Inadequate air circulation. Check if air sweep fans are functioning, check electrical
connections.
There are glass gaps on
the side of the case.
See glass adjustment section.
Water has pooled
under case.
Case drain is clogged.
Clear drain.
PVC drains under case
may have a leak.
Repair as needed.
Case tub has unsealed
opening.
Seal as needed.
If the case is in a line-
up, case to case joint is
missing or unsealed.
Install case to case joint and seal as needed.
Evaporator pan is
overflowing (if applicable).
Check electrical connection to evaporator pan. Check float
assembly, it should move freely up and down the support
stem. Clear any debris.
Case is not draining
properly.
Case is not level.
Level the case.
Drain screen is plugged.
Clean drain screen and remove any debris.
Drain or P-trap is
clogged.
Clear any debris.
Frost or ice on
evaporator coil.
Evaporator fans are not
functioning.
Check electrical connections.
Defrost clock is not
functioning.
Case should be serviced by a qualified service technician.
Coil is freezing over.
Return air is blocked, make sure debris is not blocking the
intake section.
Coil close-offs are not installed. Inspect coil to make sure
these parts are on the case.
Lights do not come
on.
Ballast/light socket wiring. Check electrical connections. See Electrical Section and
check wiring diagram.
Ballast needs to be
replaced.
Case should be serviced by a qualified service technician.
See Electrical Section.
Lamp socket needs to be
replaced.
Case should be serviced by a qualified service technician.
Lamp needs to be
replaced.
See Maintenance Section.
Light Switch needs to
replaced.
Case should be serviced by a qualified service technician.
