Metro T-Series Hot Food Holding Cabinets - Manual (Page 13)

13
BASIC TROUBLESHOOTING
WARNING
:
Only factory approved service agents should attempt to service, repair or replace electrical components,
wiring or power cord.
1. Controls do not work (no display or indicator lights):
• Check that the cabinet is plugged-in.
• Check that the outlet has power.
• Check that the power switch is in the “On” position.
• Check the cabinet wiring from the power cord to the power switch and to the controller.
• Controller is faulty.
2. Controller temperature display does not change (displays a constant value approximately equal to the
minimum or maximum of the set point temperature range, 85°F (29°C) or 200°F (93°C):
a. The temperature sensor and controller are not communicating:
• Controller needs to be replaced.
• Temperature sensor needs to be replaced.
3. Temperature too hot:
a. During initial pre-heat, cabinet may overshoot set point.
b. If displayed temperature exceeds 220°F (104°C):
• Blower wiring is faulty or disconnected. Blower needs replacing.
• The thermostat may have failed and the thermal cut-out device is controlling the temperature.
• Thermal cut-out device may have failed.
c. Digital control: Refer to page 9 section -— “High Temperature Alarm” for changing the set point temperature.
4. Temperature too low:
a. The cabinet may still be in pre-heat or recovering from the door being opened.
b. Door(s) is not closed or sealing properly.
c. Worn out door gaskets. Replace gaskets.
d. Blower is not circulating air:
• Blower wiring is faulty or disconnected.
e. Refer to page 9 section — “low Temperature Alarm” for changing the set point temperature.
5. No heat generated
a. If the heat indicator light is on but the cabinet does not draw approximately 12 amps for 120V 1400W units and
8 amps for 220-240V 1176-1400W
• Air heater element may be faulty.
• The wiring to the air heater element may be faulty or disconnected.
• The controller (air heater relay) may be faulty.
b. If the heat indicator light does not come on, the controller may be faulty.
6. Display problems in cabinets:
• Refer to page 10 section — “Service Diagnostic Codes”.