42
Troubleshooting
Service Manual
SKOPE OD260
7. Controller displays
‘cht’ and ‘CHT’
alarms
• Restricted ventilation.
• Ensure no restriction to cabinet
airflow at front and rear of cabinet. If
possible, space the cabinet slightly
out from the wall.
• Excessive heatload into cabinet.
• Ensure ambient has not risen above
25°.
• Blocked or restricted condenser coil.
• Clean condenser coil (see page 40).
• Visually check condenser for
possible restriction. Remove
condensate tray and clean. If bad,
refrigeration unit removal may be
necessary.
• Condenser fan motor failure or
intermittent overload trip.
• Check motor and replace if at all
dubious.
• Condenser fan incorrect rotation
• Check rotation and change as
necessary.
• Over-charged with refrigerant (critical
measured charge required).
• If over-charge is apparent, evacuate
and recharge to rating label.
8. Water on floor
• Condensate tray overflow.
• Check condensate tray.
• Excess humidity.
• Keep humidity below 60%.
• Cabinet not level.
• Ensure the cabinet is positioned on
a level surface.
• Sludge build-up in condensate tray.
• Remove condensate tray and clean.
9. Water / ice within
evaporator box
• Blocked drain tube, causing the box to fill
with water.
• Remove the unit and clean out the
bottom of the evaporator box and
drain entry.
• Inadequate defrost time due to loose or
faulty evaporator probe.
• Secure or replace probe.
10. Moisture or
condensation on
product
• When humidity is above 65% RH, this
may begin to occur.
• Keep humidity below 60%.
11. Product is
deteriorating at an
excessive rate
(e.g. milk going
‘off’).
• Incorrect controller program.
• Confirm correct program is used.
Possibly alter setpoint colder.
• Cabinet overloaded and / or restricted
internal or external ventilation.
• Ensure the maximum operating
ambient condition is 25°C/60% RH.
• External drafts.
• Ensure there is NO noticeable draft
and that the cabinet is situated well
clear of doorways and other points of
ventilation and air-conditioning.
